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Cisco Security Advisory

Multiple Multicast Vulnerabilities in Cisco IOS Software

Advisory ID: cisco-sa-20080924-multicast

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20080924-multicast

Revision 1.3

For Public Release 2008 September 24 16:00  UTC (GMT)

Related Resources:

View related IPS SignatureView related Applied Mitigation Bulletin

Summary

Two crafted Protocol Independent Multicast (PIM) packet vulnerabilities exist in Cisco IOS software that may lead to a denial of service (DoS) condition. Cisco has released free software updates that address these vulnerabilities. Workarounds that mitigate these vulnerabilities are available.

This advisory is posted at http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20080924-multicast.

Note: The September 24, 2008 IOS Advisory bundled publication includes twelve Security Advisories. Eleven of the advisories address vulnerabilities in Cisco's IOS software, and one advisory addresses vulnerabilities in Cisco Unified Communications Manager. Each Advisory lists the releases that correct the vulnerability described in the Advisory.

Individual publication links are listed below:

Affected Products

Vulnerable Products

Devices that are running Cisco IOS Software and configured for PIM have a vulnerability related to a specially crafted PIM packet. In addition, Cisco 12000 Series (GSR) routers running Cisco IOS Software have a second vulnerability related to a crafted multicast packet.

The show running-config | include ip pim command can be issued to verify that a Cisco IOS device is configured for PIM. In the following example, the Cisco IOS router is configured for PIM sparse-dense mode.

Router#show running-config | include ip pim
 ip pim sparse-dense-mode

Note that available PIM modes on a Cisco IOS device are dense mode, sparse mode, or sparse-dense mode. A device that is configured for any of these modes is affected by these vulnerabilities. The mode determines how the device populates its multicast routing table and how multicast packets are forwarded. PIM must be enabled in one of these modes on at least one interface in order for a device to process IP multicast routing. There is no default mode setting. Multicast routing is disabled by default. However, a Cisco IOS device is vulnerable if at least one interface is configured for PIM.

Additionally, To display information about interfaces configured for Protocol Independent Multicast (PIM), use the show ip pim interface command in user EXEC or privileged EXEC mode, as shown in the following example:

Router# show ip pim interface

Address          Interface                Ver/   Nbr    Query  DR     DR
                                          Mode   Count  Intvl  Prior

10.1.0.1         GigabitEthernet0/0       v2/SD  0      30     1      10.1.0.1
10.6.0.1         GigabitEthernet0/1       v2/SD  1      30     1      10.6.0.2

In order to determine the software that runs on a Cisco IOS product, log in to the device and issue the show version command to display the system banner. Cisco IOS software identifies itself as "Internetwork Operating System Software" or simply "IOS." On the next line of output, the image name displays between parentheses, followed by "Version" and the Cisco IOS release name. Other Cisco devices do not have the show version command or give different output.

The following example shows output from a device that runs an IOS image:

router>show version
Cisco IOS Software, 7200 Software (C7200-ADVSECURITYK9-M), Version 12.4(6)T2, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2006 by Cisco Systems, Inc.
Compiled Tue 16-May-06 16:09 by kellythw
<more output removed for brevity>

Products Confirmed Not Vulnerable

Cisco IOS devices that are not configured for PIM are not vulnerable. Cisco IOS XR Software is not affected by this vulnerability. No other Cisco products are currently known to be affected by this vulnerability.

Details

Two crafted Protocol Independent Multicast (PIM) packet vulnerabilities exist in Cisco IOS Software that may lead to a denial of service (DoS) condition. Devices that run Cisco IOS Software and are configured for PIM are affected by the first vulnerability. Only Cisco 12000 Series (GSR) routers that are configured for PIM are affected by the second vulnerability.

Available PIM modes on a Cisco IOS device are dense mode, sparse mode, or sparse-dense mode. The mode determines how the device populates its multicast routing table and how multicast packets are forwarded. PIM must be enabled in one of these modes on at least one interface in order for a device to process IP multicast routing.

Note: There is no default mode setting. Multicast routing is disabled by default. However, a Cisco IOS device is vulnerable if at least one interface is configured for PIM.

To configure PIM on an interface to be in dense mode, use the following command in interface configuration mode:

Router(config-if)# ip pim dense-mode

To configure PIM on an interface to be in sparse mode, use the following command in interface configuration mode:

Router(config-if)# ip pim sparse-mode

To configure PIM on an interface to be in sparse-dense mode, use the following command in interface configuration mode:

Router(config-if)# ip pim sparse-dense-mode

These vulnerabilities are documented in the following Cisco Bug IDs:

  • CSCsd95616 - Crafted PIM packets may cause an IOS device to reload
  • CSCsl34355 - GSR may crash when processing a malformed multicast packet

These vulnerabilities have been assigned the Common Vulnerabilities and Exposures (CVE) identifiers CVE-2008-3808 and CVE-2008-3809.

Vulnerability Scoring Details

Cisco has provided scores for the vulnerabilities in this advisory based on the Common Vulnerability Scoring System (CVSS). The CVSS scoring in this Security Advisory is done in accordance with CVSS version 2.0.

CVSS is a standards-based scoring method that conveys vulnerability severity and helps determine urgency and priority of response.

Cisco has provided a base and temporal score. Customers can then compute environmental scores to assist in determining the impact of the vulnerability in individual networks.

Cisco has provided an FAQ to answer additional questions regarding CVSS at

http://www.cisco.com/web/about/security/intelligence/cvss-qandas.html .

Cisco has also provided a CVSS calculator to help compute the environmental impact for individual networks at

http://intellishield.cisco.com/security/alertmanager/cvss .

CSCsd95616 - Crafted PIM packets may cause an IOS device to reload

Calculate the environmental score of CSCsd95616

CVSS Base Score - 7.8

Access Vector

Access Complexity

Authentication

Confidentiality Impact

Integrity Impact

Availability Impact

Network

Low

None

None

None

Complete

CVSS Temporal Score - 6.4

Exploitability

Remediation Level

Report Confidence

Functional

Official-Fix

Confirmed

CSCsl34355 - GSR may crash when processing a malformed multicast packet

Calculate the environmental score of CSCsl34355

CVSS Base Score - 7.8

Access Vector

Access Complexity

Authentication

Confidentiality Impact

Integrity Impact

Availability Impact

Network

Low

None

None

None

Complete

CVSS Temporal Score - 6.4

Exploitability

Remediation Level

Report Confidence

Functional

Official-Fix

Confirmed

Impact

Successful exploitation may cause a reload of the affected device. Repeated exploitation could result in a sustained denial of service (DoS) condition.

Software Versions and Fixes

When considering software upgrades, also consult http://www.cisco.com/go/psirt and any subsequent advisories to determine exposure and a complete upgrade solution.

In all cases, customers should exercise caution to be certain the devices to be upgraded contain sufficient memory and that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, contact the Cisco Technical Assistance Center (TAC) or your contracted maintenance provider for assistance.

Each row of the Cisco IOS software table (below) names a Cisco IOS release train. If a given release train is vulnerable, then the earliest possible releases that contain the fix (along with the anticipated date of availability for each, if applicable) are listed in the "First Fixed Release" column of the table. The "Recommended Release" column indicates the releases which have fixes for all the published vulnerabilities at the time of this Advisory. A device running a release in the given train that is earlier than the release in a specific column (less than the First Fixed Release) is known to be vulnerable. Cisco recommends upgrading to a release equal to or later than the release in the "Recommended Releases" column of the table.

Major Release

     Availability of Repaired Releases

Affected 12.0-Based Releases

First Fixed Release

Recommended Release

12.0

Vulnerable; first fixed in 12.2

12.4(15)T7

12.4(18c)

12.0DA

Releases prior to 12.0(8)DA3 are vulnerable, release 12.0(8)DA3 and later are not vulnerable; first fixed in 12.2DA

12.2(12)DA13

12.4(15)T7

12.4(18c)

12.0DB

Vulnerable; first fixed in 12.2

12.4(15)T7

12.4(18c)

12.0DC

Vulnerable; first fixed in 12.2

12.4(15)T7

12.4(18c)

12.0S

12.0(32)S8

12.0(33)S

12.0(32)S11

12.0(33)S1

12.0SC

Vulnerable; first fixed in 12.0S

12.0(32)S11

12.0(33)S1

12.0SL

Vulnerable; first fixed in 12.2

12.4(15)T7

12.4(18c)

12.0SP

Vulnerable; first fixed in 12.2

12.4(15)T7

12.4(18c)

12.0ST

Vulnerable; first fixed in 12.0S

12.0(32)S11

12.0(33)S1

12.0SX

Vulnerable; first fixed in 12.0S

12.0(32)S11

12.0(33)S1

12.0SY

12.0(32)SY5

12.0(32)SY7; Available on 29-SEP-08

12.0SZ

12.0(30)SZ4

12.0(32)S11

12.0(33)S1

12.0T

Vulnerable; first fixed in 12.2

12.4(15)T7

12.4(18c)

12.0W

Vulnerable; first fixed in 12.2

12.0(3c)W5(8)

12.0WC

Releases prior to 12.0(5)WC10 are vulnerable, release 12.0(5)WC10 and later are not vulnerable; first fixed in 12.2

12.4(15)T7

12.4(18c)

12.0WT

Not Vulnerable

 

12.0XA

Vulnerable; first fixed in 12.2

12.4(15)T7

12.4(18c)

12.0XB

Vulnerable; first fixed in 12.2

12.4(15)T7

12.4(18c)

12.0XC

Releases prior to 12.0(2)XC2 are vulnerable, release 12.0(2)XC2 and later are not vulnerable; first fixed in 12.2

12.4(15)T7

12.4(18c)

12.0XD

Vulnerable; first fixed in 12.2

12.4(15)T7

12.4(18c)

12.0XE

Vulnerable; first fixed in 12.2

12.4(15)T7

12.4(18c)

12.0XF

Not Vulnerable

 

12.0XG

Vulnerable; first fixed in 12.2

12.4(15)T7

12.4(18c)

12.0XH

Vulnerable; first fixed in 12.2

12.4(15)T7

12.4(18c)

12.0XI

Releases prior to 12.0(4)XI2 are vulnerable, release 12.0(4)XI2 and later are not vulnerable; first fixed in 12.2

12.4(15)T7

12.4(18c)

12.0XJ

Vulnerable; first fixed in 12.2

12.4(15)T7

12.4(18c)

12.0XK

Vulnerable; first fixed in 12.2

12.4(15)T7

12.4(18c)

12.0XL

Vulnerable; first fixed in 12.2

12.4(15)T7

12.4(18c)

12.0XM

Vulnerable; first fixed in 12.2

12.4(15)T7

12.4(18c)

12.0XN

Vulnerable; first fixed in 12.2

12.4(15)T7

12.4(18c)

12.0XQ

Vulnerable; first fixed in 12.2

12.4(15)T7

12.4(18c)

12.0XR

Vulnerable; first fixed in 12.2

12.4(15)T7

12.4(18c)

12.0XS

Not Vulnerable

 

12.0XT

Vulnerable; first fixed in 12.2

12.4(15)T7

12.4(18c)

12.0XV

Vulnerable; first fixed in 12.2

12.4(15)T7

12.4(18c)

Affected 12.1-Based Releases

First Fixed Release

Recommended Release

12.1

Vulnerable; first fixed in 12.2

12.4(15)T7

12.4(18c)

12.1AA

Vulnerable; first fixed in 12.2

12.4(15)T7

12.4(18c)

12.1AX

Vulnerable; first fixed in 12.2EY

12.2(46)SE

12.1AY

Releases prior to 12.1(22)AY1 are vulnerable, release 12.1(22)AY1 and later are not vulnerable; first fixed in 12.1EA

12.1(22)EA12

12.2(46)SE

12.1AZ

Not Vulnerable

 

12.1CX

Vulnerable; first fixed in 12.2

12.4(15)T7

12.4(18c)

12.1DA

Vulnerable; first fixed in 12.2DA

12.2(12)DA13

12.4(15)T7

12.4(18c)

12.1DB

Vulnerable; first fixed in 12.2

12.4(15)T7

12.4(18c)

12.1DC

Vulnerable; first fixed in 12.2

12.4(15)T7

12.4(18c)

12.1E

12.1(27b)E2

12.2(18)SXF15

12.1EA

12.1(22)EA10

12.1(22)EA12

12.1EB

Vulnerable; contact TAC

 

12.1EC

Vulnerable; first fixed in 12.3BC

12.2(33)SCA1

12.3(23)BC4

12.1EO

Vulnerable; first fixed in 12.2SV

 

12.1EU

Vulnerable; first fixed in 12.2EWA

12.2(25)EWA14

12.2(31)SGA8

12.2(46)SG1

12.1EV

Not Vulnerable

 

12.1EW

Vulnerable; first fixed in 12.2

12.2(25)EWA14

12.2(31)SGA8

12.2(46)SG1

12.4(15)T7

12.4(18c)

12.1EX

Vulnerable; first fixed in 12.2

12.4(15)T7

12.4(18c)

12.1EY

Vulnerable; contact TAC

 

12.1EZ

Vulnerable; first fixed in 12.1E

12.2(18)SXF15

12.4(15)T7

12.4(18c)

12.1GA

Vulnerable; first fixed in 12.2

12.4(15)T7

12.4(18c)

12.1GB

Vulnerable; first fixed in 12.2

12.4(15)T7

12.4(18c)

12.1T

Vulnerable; first fixed in 12.2

12.4(15)T7

12.4(18c)

12.1XA

Vulnerable; first fixed in 12.2

12.4(15)T7

12.4(18c)

12.1XB

Vulnerable; first fixed in 12.2

12.4(15)T7

12.4(18c)

12.1XC

Vulnerable; first fixed in 12.2

12.4(15)T7

12.4(18c)

12.1XD

Vulnerable; first fixed in 12.2

12.4(15)T7

12.4(18c)

12.1XE

Vulnerable; first fixed in 12.2

12.4(15)T7

12.4(18c)

12.1XF

Vulnerable; first fixed in 12.2

12.4(15)T7

12.4(18c)

12.1XG

Vulnerable; first fixed in 12.2

12.4(15)T7

12.4(18c)

12.1XH

Vulnerable; first fixed in 12.2

12.4(15)T7

12.4(18c)

12.1XI

Vulnerable; first fixed in 12.2

12.4(15)T7

12.4(18c)

12.1XJ

Vulnerable; first fixed in 12.2

12.4(15)T7

12.4(18c)

12.1XL

Vulnerable; first fixed in 12.2

12.4(15)T7

12.4(18c)

12.1XM

Vulnerable; first fixed in 12.2

12.4(15)T7

12.4(18c)

12.1XP

Vulnerable; first fixed in 12.2

12.4(15)T7

12.4(18c)

12.1XQ

Vulnerable; first fixed in 12.2

12.4(15)T7

12.4(18c)

12.1XR

Vulnerable; first fixed in 12.2

12.4(15)T7

12.4(18c)

12.1XS

Vulnerable; first fixed in 12.2

12.4(15)T7

12.4(18c)

12.1XT

Vulnerable; first fixed in 12.2

12.4(15)T7

12.4(18c)

12.1XU

Vulnerable; first fixed in 12.2

12.4(15)T7

12.4(18c)

12.1XV

Vulnerable; first fixed in 12.2

12.4(15)T7

12.4(18c)

12.1XW

Vulnerable; first fixed in 12.2

12.4(15)T7

12.4(18c)

12.1XX

Vulnerable; first fixed in 12.2

12.4(15)T7

12.4(18c)

12.1XY

Vulnerable; first fixed in 12.2

12.4(15)T7

12.4(18c)

12.1XZ

Vulnerable; first fixed in 12.2

12.4(15)T7

12.4(18c)

12.1YA

Vulnerable; first fixed in 12.2

12.4(15)T7

12.4(18c)

12.1YB

Vulnerable; first fixed in 12.2

12.4(15)T7

12.4(18c)

12.1YC

Vulnerable; first fixed in 12.2

12.4(15)T7

12.4(18c)

12.1YD

Vulnerable; first fixed in 12.2

12.4(15)T7

12.4(18c)

12.1YE

Releases prior to 12.1(5)YE6 are vulnerable, release 12.1(5)YE6 and later are not vulnerable; first fixed in 12.2

12.4(15)T7

12.4(18c)

12.1YF

Vulnerable; first fixed in 12.2

12.4(15)T7

12.4(18c)

12.1YH

Vulnerable; first fixed in 12.2

12.4(15)T7

12.4(18c)

12.1YI

Vulnerable; contact TAC

 

12.1YJ

Not Vulnerable

 

Affected 12.2-Based Releases

First Fixed Release

Recommended Release

12.2

12.2(26c)

12.2(27c)

12.2(28d)

12.2(29b)

12.2(46)

12.4(15)T7

12.4(18c)

12.2B

Vulnerable; first fixed in 12.3

12.4(15)T7

12.4(18c)

12.2BC

Vulnerable; first fixed in 12.3

12.2(33)SCA1

12.3(23)BC4

12.4(15)T7

12.4(18c)

12.2BW

Vulnerable; first fixed in 12.3

12.4(15)T7

12.4(18c)

12.2BX

Vulnerable; first fixed in 12.3

12.2(33)SB2; Available on 26-SEP-08

12.4(15)T7

12.4(18c)

12.2BY

Vulnerable; first fixed in 12.3

12.4(15)T7

12.4(18c)

12.2BZ

Vulnerable; first fixed in 12.3

12.4(15)T7

12.4(18c)

12.2CX

Vulnerable; first fixed in 12.3

12.2(33)SCA1

12.3(23)BC4

12.4(15)T7

12.4(18c)

12.2CY

Vulnerable; first fixed in 12.3

12.2(33)SCA1

12.3(23)BC4

12.4(15)T7

12.4(18c)

12.2CZ

Vulnerable; first fixed in 12.2S

12.2(33)SB2; Available on 26-SEP-08

12.2DA

12.2(10)DA9

12.2(12)DA13

12.2(12)DA13

12.2DD

Vulnerable; first fixed in 12.3

12.4(15)T7

12.4(18c)

12.2DX

Vulnerable; first fixed in 12.3

12.4(15)T7

12.4(18c)

12.2EW

Vulnerable; first fixed in 12.2EWA

12.2(25)EWA14

12.2(31)SGA8

12.2(46)SG1

12.2EWA

12.2(25)EWA10

12.2(25)EWA11

12.2(25)EWA14

12.2EX

12.2(37)EX

12.2(35)EX2

12.2EY

12.2(37)EY

 

12.2EZ

Vulnerable; first fixed in 12.2SEE

12.2(46)SE

12.2FX

Not Vulnerable

 

12.2FY

Not Vulnerable

 

12.2FZ

Vulnerable; first fixed in 12.2SE

12.2(46)SE

12.2IRB

Not Vulnerable

 

12.2IXA

Vulnerable; migrate to any release in 12.2IXE

12.2(18)IXG

12.2IXB

Vulnerable; migrate to any release in 12.2IXE

12.2(18)IXG

12.2IXC

Vulnerable; migrate to any release in 12.2IXE

12.2(18)IXG

12.2IXD

Vulnerable; migrate to any release in 12.2IXE

12.2(18)IXG

12.2IXE

Not Vulnerable

 

12.2IXF

Not Vulnerable

 

12.2IXG

Not Vulnerable

 

12.2JA

Not Vulnerable

 

12.2JK

Not Vulnerable

 

12.2MB

Vulnerable; first fixed in 12.2SW

12.2(25)SW12

12.4(15)T7

12.4(18c)

12.2MC

12.2(15)MC2i

12.4(15)T7

12.4(18c)

12.2S

12.2(14)S18

12.2(18)S13

12.2(20)S13

12.2(25)S13

12.2(33)SB2; Available on 26-SEP-08

12.2SB

12.2(28)SB7

12.2(31)SB5

12.2(33)SB

12.2(33)SB2; Available on 26-SEP-08

12.2SBC

Vulnerable; first fixed in 12.2SB

12.2(33)SB2; Available on 26-SEP-08

12.2SCA

Not Vulnerable

 

12.2SE

12.2(35)SE4

12.2(37)SE

12.2(46)SE

12.2SEA

Vulnerable; first fixed in 12.2SEE

12.2(46)SE

12.2SEB

Vulnerable; first fixed in 12.2SEE

12.2(46)SE

12.2SEC

Vulnerable; first fixed in 12.2SEE

12.2(46)SE

12.2SED

Vulnerable; first fixed in 12.2SEE

12.2(46)SE

12.2SEE

12.2(25)SEE4

12.2(46)SE

12.2SEF

Not Vulnerable

 

12.2SEG

12.2(25)SEG3

12.2(25)SEG6

12.2SG

12.2(25)SG3

12.2(31)SG3

12.2(37)SG

12.2(46)SG1

12.2SGA

12.2(31)SGA2

12.2(31)SGA8

12.2SL

Not Vulnerable

 

12.2SM

12.2(29)SM3

12.2(29)SM4

12.2SO

Vulnerable; first fixed in 12.2SV

 

12.2SRA

12.2(33)SRA4

12.2(33)SRB4

12.2(33)SRC2

12.2SRB

Not Vulnerable

 

12.2SRC

Not Vulnerable

 

12.2SU

Vulnerable; first fixed in 12.4

12.4(15)T7

12.4(18c)

12.2SV

12.2(29b)SV1

 

12.2SVA

Not Vulnerable

 

12.2SVC

Not Vulnerable

 

12.2SVD

Not Vulnerable

 

12.2SW

12.2(25)SW12

12.2(25)SW12

12.2SX

Vulnerable; first fixed in 12.2SXF

12.2(18)SXF15

12.2SXA

Vulnerable; first fixed in 12.2SXF

12.2(18)SXF15

12.2SXB

Vulnerable; first fixed in 12.2SXF

12.2(18)SXF15

12.2SXD

Vulnerable; first fixed in 12.2SXF

12.2(18)SXF15

12.2SXE

Vulnerable; first fixed in 12.2SXF

12.2(18)SXF15

12.2SXF

12.2(18)SXF9

12.2(18)SXF15

12.2SXH

Not Vulnerable

 

12.2SY

Vulnerable; first fixed in 12.2S

12.2(33)SB2; Available on 26-SEP-08

12.2SZ

Vulnerable; first fixed in 12.2S

12.2(33)SB2; Available on 26-SEP-08

12.2T

Vulnerable; first fixed in 12.3

12.4(15)T7

12.4(18c)

12.2TPC

Vulnerable; contact TAC

 

12.2XA

Vulnerable; first fixed in 12.3

12.4(15)T7

12.4(18c)

12.2XB

Vulnerable; first fixed in 12.3

12.4(15)T7

12.4(18c)

12.2XC

Vulnerable; first fixed in 12.3

12.4(15)T7

12.4(18c)

12.2XD

Vulnerable; first fixed in 12.3

12.4(15)T7

12.4(18c)

12.2XE

Vulnerable; first fixed in 12.3

12.4(15)T7

12.4(18c)

12.2XF

Vulnerable; first fixed in 12.3

12.2(33)SCA1

12.3(23)BC4

12.4(15)T7

12.4(18c)

12.2XG

Releases prior to 12.2(2)XG1 are vulnerable, release 12.2(2)XG1 and later are not vulnerable; first fixed in 12.3

12.4(15)T7

12.4(18c)

12.2XH

Vulnerable; first fixed in 12.3

12.4(15)T7

12.4(18c)

12.2XI

Vulnerable; first fixed in 12.3

12.4(15)T7

12.4(18c)

12.2XJ

Vulnerable; first fixed in 12.3

12.4(15)T7

12.4(18c)

12.2XK

Vulnerable; first fixed in 12.3

12.4(15)T7

12.4(18c)

12.2XL

Vulnerable; first fixed in 12.3

12.4(15)T7

12.4(18c)

12.2XM

Vulnerable; first fixed in 12.3

12.4(15)T7

12.4(18c)

12.2XN

12.2(33)XN1

12.2(33)SB2; Available on 26-SEP-08

12.2(33)SRC2

12.2(33)XNA2

12.2XNA

Not Vulnerable

 

12.2XNB

Not Vulnerable

 

12.2XO

Not Vulnerable

 

12.2XQ

Vulnerable; first fixed in 12.3

12.4(15)T7

12.4(18c)

12.2XR

Releases prior to 12.2(15)XR are vulnerable, release 12.2(15)XR and later are not vulnerable; first fixed in 12.3

12.3(8)JEA3

12.4(15)T7

12.4(18c)

12.2XS

Vulnerable; first fixed in 12.3

12.4(15)T7

12.4(18c)

12.2XT

Vulnerable; first fixed in 12.3

12.4(15)T7

12.4(18c)

12.2XU

Vulnerable; first fixed in 12.3

12.4(15)T7

12.4(18c)

12.2XV

Vulnerable; first fixed in 12.3

12.4(15)T7

12.4(18c)

12.2XW

Vulnerable; first fixed in 12.3

12.4(15)T7

12.4(18c)

12.2YA

Vulnerable; first fixed in 12.3

12.4(15)T7

12.4(18c)

12.2YB

Vulnerable; contact TAC

 

12.2YC

Vulnerable; contact TAC

 

12.2YD

Vulnerable; contact TAC

 

12.2YE

Vulnerable; contact TAC

 

12.2YF

Vulnerable; contact TAC

 

12.2YG

Vulnerable; contact TAC

 

12.2YH

Vulnerable; contact TAC

 

12.2YJ

Vulnerable; contact TAC

 

12.2YK

Vulnerable; contact TAC

 

12.2YL

Vulnerable; contact TAC

 

12.2YM

Vulnerable; first fixed in 12.4

12.4(15)T7

12.4(18c)

12.2YN

Vulnerable; contact TAC

 

12.2YO

Vulnerable; contact TAC

 

12.2YP

Vulnerable; first fixed in 12.3

12.4(15)T7

12.4(18c)

12.2YQ

Vulnerable; contact TAC

 

12.2YR

Vulnerable; contact TAC

 

12.2YS

Not Vulnerable

 

12.2YT

Vulnerable; contact TAC

 

12.2YU

Vulnerable; contact TAC

 

12.2YV

Vulnerable; contact TAC

 

12.2YW

Vulnerable; contact TAC

 

12.2YX

Vulnerable; contact TAC

 

12.2YY

Vulnerable; contact TAC

 

12.2YZ

Vulnerable; contact TAC

 

12.2ZA

Vulnerable; first fixed in 12.2SXF

12.2(18)SXF15

12.2ZB

Vulnerable; contact TAC

 

12.2ZC

Vulnerable; contact TAC

 

12.2ZD

Vulnerable; contact TAC

 

12.2ZE

Vulnerable; first fixed in 12.3

12.4(15)T7

12.4(18c)

12.2ZF

Vulnerable; first fixed in 12.4

12.4(15)T7

12.4(18c)

12.2ZG

Vulnerable; first fixed in 12.4

12.4(15)T7

12.4(18c)

12.2ZH

12.2(13)ZH9

12.4(15)T7

12.4(18c)

12.2ZJ

Vulnerable; contact TAC

 

12.2ZL

Vulnerable; contact TAC

 

12.2ZP

Vulnerable; contact TAC

 

12.2ZU

Vulnerable; migrate to any release in 12.2SXH

12.2(33)SXH3

12.2ZX

Vulnerable; first fixed in 12.2SB

12.2(33)SB2; Available on 26-SEP-08

12.2ZY

Not Vulnerable

 

12.2ZYA

Not Vulnerable

 

Affected 12.3-Based Releases

First Fixed Release

Recommended Release

12.3

12.3(17c)

12.3(18a)

12.3(19a)

12.3(20a)

12.3(21)

12.4(15)T7

12.4(18c)

12.3B

Vulnerable; first fixed in 12.4

12.4(15)T7

12.4(18c)

12.3BC

12.3(17b)BC6

12.3(21)BC

12.3(23)BC4

12.3BW

Vulnerable; first fixed in 12.4

12.4(15)T7

12.4(18c)

12.3EU

Not Vulnerable

 

12.3JA

Not Vulnerable

 

12.3JEA

Not Vulnerable

 

12.3JEB

Not Vulnerable

 

12.3JEC

Not Vulnerable

 

12.3JK

Not Vulnerable

 

12.3JL

Not Vulnerable

 

12.3JX

Not Vulnerable

 

12.3T

Vulnerable; first fixed in 12.4

12.4(15)T7

12.4(18c)

12.3TPC

Vulnerable; contact TAC

 

12.3VA

Not Vulnerable

 

12.3XA

12.3(2)XA7

12.4(15)T7

12.4(18c)

12.3XB

Vulnerable; contact TAC

 

12.3XC

Vulnerable; first fixed in 12.4

12.4(15)T7

12.4(18c)

12.3XD

Vulnerable; first fixed in 12.4

12.4(15)T7

12.4(18c)

12.3XE

Vulnerable; first fixed in 12.4

12.4(15)T7

12.4(18c)

12.3XF

Vulnerable; contact TAC

 

12.3XG

Vulnerable; first fixed in 12.4

12.4(15)T7

12.4(18c)

12.3XI

12.3(7)XI10

12.2(33)SB2; Available on 26-SEP-08

12.3XJ

Vulnerable; first fixed in 12.3YX

12.3(14)YX13

12.4(15)T7

12.3XK

Vulnerable; first fixed in 12.4

12.4(15)T7

12.4(18c)

12.3XL

Vulnerable; first fixed in 12.4

12.4(15)T7

12.4(18c)

12.3XQ

Vulnerable; first fixed in 12.4

12.4(15)T7

12.4(18c)

12.3XR

12.3(7)XR7

12.4(15)T7

12.4(18c)

12.3XS

Vulnerable; first fixed in 12.4

12.4(15)T7

12.4(18c)

12.3XU

Vulnerable; first fixed in 12.4T

12.4(15)T7

12.3XW

Vulnerable; first fixed in 12.3YX

12.3(14)YX13

12.4(15)T7

12.3XX

12.3(8)XX2d

12.4(15)T7

12.4(18c)

12.3XY

Vulnerable; first fixed in 12.4

12.4(15)T7

12.4(18c)

12.3XZ

Vulnerable; first fixed in 12.4

12.4(15)T7

12.4(18c)

12.3YA

Vulnerable; first fixed in 12.4

12.4(15)T7

12.4(18c)

12.3YD

Vulnerable; first fixed in 12.4T

12.4(15)T7

12.3YF

Vulnerable; first fixed in 12.3YX

12.3(14)YX13

12.4(15)T7

12.3YG

12.3(8)YG6

12.4(15)T7

12.3YH

Vulnerable; first fixed in 12.4T

12.4(15)T7

12.3YI

Vulnerable; first fixed in 12.4T

12.4(15)T7

12.3YJ

Vulnerable; first fixed in 12.4T

12.4(15)T7

12.3YK

Vulnerable; first fixed in 12.4T

12.4(15)T7

12.3YM

12.3(14)YM10

12.3(14)YM13; Available on 30-SEP-08

12.3YQ

Vulnerable; first fixed in 12.4T

12.4(15)T7

12.3YS

Vulnerable; first fixed in 12.4T

12.4(15)T7

12.3YT

Vulnerable; first fixed in 12.4T

12.4(15)T7

12.3YU

Vulnerable; first fixed in 12.4XB

12.4(2)XB10

12.4(9)XG3

12.4(15)T7

12.3YX

12.3(14)YX8

12.3(14)YX13

12.3YZ

12.3(11)YZ3

 

12.3ZA

Vulnerable; first fixed in 12.4T

12.4(15)T7

Affected 12.4-Based Releases

First Fixed Release

Recommended Release

12.4

12.4(10c)

12.4(12)

12.4(3h)

12.4(5c)

12.4(7e)

12.4(8d)

12.4(18c)

12.4JA

Not Vulnerable

 

12.4JK

Not Vulnerable

 

12.4JL

Not Vulnerable

 

12.4JMA

Not Vulnerable

 

12.4JMB

Not Vulnerable

 

12.4JMC

Not Vulnerable

 

12.4JX

Not Vulnerable

 

12.4MD

Not Vulnerable

 

12.4MR

12.4(11)MR

12.4(19)MR

12.4SW

Not Vulnerable

 

12.4T

12.4(11)T

12.4(2)T6

12.4(4)T8

12.4(6)T7

12.4(9)T3

12.4(15)T7

12.4XA

Vulnerable; first fixed in 12.4T

12.4(15)T7

12.4XB

12.4(2)XB6

12.4(2)XB10

12.4XC

Vulnerable; first fixed in 12.4T

12.4(15)T7

12.4XD

12.4(4)XD8

12.4(4)XD11; Available on 26-SEP-08

12.4XE

Vulnerable; first fixed in 12.4T

12.4(15)T7

12.4XF

Not Vulnerable

 

12.4XG

12.4(9)XG2

12.4(9)XG3

12.4XJ

Not Vulnerable

 

12.4XK

Not Vulnerable

 

12.4XL

Not Vulnerable

 

12.4XM

Not Vulnerable

 

12.4XN

Not Vulnerable

 

12.4XP

Vulnerable; contact TAC

 

12.4XQ

Not Vulnerable

 

12.4XR

Not Vulnerable

 

12.4XT

12.4(6)XT2

12.4(15)T7

12.4XV

Not Vulnerable

 

12.4XW

Not Vulnerable

 

12.4XY

Not Vulnerable

 

12.4XZ

Not Vulnerable

 

12.4YA

Not Vulnerable

 


Workarounds

There are no workarounds for the second vulnerability. The following workarounds only apply to the vulnerability addressed in Cisco bug ID CSCsd95616. A PIM router must receive PIM Hellos to establish PIM neighborship. PIM neighborship is also the basis for designated router (DR) election, DR failover, and accepting/sending PIM Join/Prune/Assert messages. To specify trusted PIM neighbors, use the ip pim neighbor-filter command, as shown in the following example:

Router(config)#access-list 1 permit host 10.10.10.123

!-- An access control list is created to allow a trusted PIM neighbor
!-- in this example the neighbor is 10.10.10.123
!

Router(config)#interface fastEthernet 0/0
Router(config-if)#ip pim neighbor-filter 1

!-- The PIM neighbor filter is then applied to the respective interface(s)

The ip pim neighbor-filter command filters PIM packets from untrusted devices including Hellos, Join/Prune, and BSR packets.

Note: The vulnerabilities described in this document can be exploited by spoofed IP packets if the attacker knows the IP address of the trusted PIM neighbors listed in the ip pim neighbor-filter implementation.

To protect infrastructure devices and minimize the risk, impact, and effectiveness of direct infrastructure attacks, administrators are advised to deploy ACLs to perform policy enforcement of traffic sent to core infrastructure equipment. PIM is IP protocol 103. As an additional workaround, administrators can explicitly permit only authorized PIM (IP protocol 103) traffic sent to infrastructure devices in accordance with existing security policies and configurations. An ACL can be deployed as shown in the following example:

ip access-list extended Infrastructure-ACL-Policy
 
 !
 !-- When applicable, include explicit permit statements for trusted
 !-- sources that require access on the vulnerable protocol
 !-- PIM routers need to communicate with the rendezvous point (RP).
 !-- In this example, 192.168.100.1 is the IP address of the 
 !-- rendezvous point, which is a trusted host that requires access 
 !-- to and from the affected PIM devices.
 !

 permit pim host 192.168.100.1 192.168.60.0 0.0.0.255
 permit pim 192.168.60.0 0.0.0.255 host 192.168.100.1
 
 !
 !-- Permit PIM segment traffic, packets have destination of:
 !-- 224.0.0.13 (PIMv2)
 !-- 224.0.0.2  (Required only by legacy PIMv1)
 !

 permit pim 192.168.60.0 0.0.0.255 host 224.0.0.13
 permit pim 192.168.60.0 0.0.0.255 host 224.0.0.2
 
 !
 !-- The following vulnerability-specific access control entries
 !-- (ACEs) can aid in identification of attacks
 !

 deny pim any 192.168.60.0 0.0.0.255 
 
 !
 !-- Explicit deny ACE for traffic sent to addresses configured within
 !-- the infrastructure address space
 !

 deny ip any 192.168.60.0 0.0.0.255
 
 !
 !-- Permit/deny all other Layer 3 and Layer 4 traffic in accordance
 !-- with existing security policies and configurations
 !
 !-- Apply iACL to interfaces in the ingress direction
 !

interface GigabitEthernet0/0
 ip access-group Infrastructure-ACL-Policy in

Additional mitigations that can be deployed on Cisco devices within the network are available in the Cisco Applied Mitigation Bulletin companion document for this advisory: http://tools.cisco.com/security/center/content/CiscoAppliedMitigationBulletin/cisco-amb-20080924-multicast.

Obtaining Fixed Software

Cisco has released free software updates that address these vulnerabilities. Prior to deploying software, customers should consult their maintenance provider or check the software for feature set compatibility and known issues specific to their environment.

Customers may only install and expect support for the feature sets they have purchased. By installing, downloading, accessing or otherwise using such software upgrades, customers agree to be bound by the terms of Cisco's software license terms found at http://www.cisco.com/en/US/docs/general/warranty/English/EU1KEN_.html, or as otherwise set forth at Cisco.com Downloads at http://www.cisco.com/public/sw-center/sw-usingswc.shtml.

Do not contact psirt@cisco.com or security-alert@cisco.com for software upgrades.

Customers with Service Contracts

Customers with contracts should obtain upgraded software through their regular update channels. For most customers, this means that upgrades should be obtained through the Software Center on Cisco's worldwide website at http://www.cisco.com.

Customers with Service Contracts

Customers Using Third-Party Support Organizations

Customers whose Cisco products are provided or maintained through prior or existing agreements with third-party support organizations, such as Cisco Partners, authorized resellers, or service providers should contact that support organization for guidance and assistance with the appropriate course of action in regards to this advisory.

The effectiveness of any workaround or fix is dependent on specific customer situations, such as product mix, network topology, traffic behavior, and organizational mission. Due to the variety of affected products and releases, customers should consult with their service provider or support organization to ensure any applied workaround or fix is the most appropriate for use in the intended network before it is deployed.

Customers Without Service Contracts

Customers who purchase direct from Cisco but do not hold a Cisco service contract, and customers who purchase through third-party vendors but are unsuccessful in obtaining fixed software through their point of sale should acquire upgrades by contacting the Cisco Technical Assistance Center (TAC). TAC contacts are as follows.

  • +1 800 553 2447 (toll free from within North America)
  • +1 408 526 7209 (toll call from anywhere in the world)
  • e-mail: tac@cisco.com

Customers should have their product serial number available and be prepared to give the URL of this notice as evidence of entitlement to a free upgrade. Free upgrades for non-contract customers must be requested through the TAC.

Refer to http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml for additional TAC contact information, including localized telephone numbers, and instructions and e-mail addresses for use in various languages.

Exploitation and Public Announcements

The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerabilities described in this advisory.

These vulnerabilities were found during internal testing.

Status of This Notice: Final

THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.

A stand-alone copy or Paraphrase of the text of this document that omits the distribution URL in the following section is an uncontrolled copy, and may lack important information or contain factual errors.


Distribution

This advisory is posted on Cisco's worldwide website at:

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20080924-multicast

In addition to worldwide web posting, a text version of this notice is clear-signed with the Cisco PSIRT PGP key and is posted to the following e-mail and Usenet news recipients.

  • cust-security-announce@cisco.com
  • first-bulletins@lists.first.org
  • bugtraq@securityfocus.com
  • vulnwatch@vulnwatch.org
  • cisco@spot.colorado.edu
  • cisco-nsp@puck.nether.net
  • full-disclosure@lists.grok.org.uk
  • comp.dcom.sys.cisco@newsgate.cisco.com

Future updates of this advisory, if any, will be placed on Cisco's worldwide website, but may or may not be actively announced on mailing lists or newsgroups. Users concerned about this problem are encouraged to check the above URL for any updates.


Revision History

Revision 1.3

2009-April-16

Removed references to the combined software table, as it is now outdated.

Revision 1.2

2008-October-14

Workaround information update.

Revision 1.1

2008-September-27

Clarify that a Cisco IOS device is vulnerable if at least one interface is configured for PIM.

Revision 1.0

2008-September-24

Initial public release

Cisco Security Procedures

Complete information on reporting security vulnerabilities in Cisco products, obtaining assistance with security incidents, and registering to receive security information from Cisco, is available on Cisco's worldwide website at http://www.cisco.com/web/about/security/psirt/security_vulnerability_policy.html. This includes instructions for press inquiries regarding Cisco security notices. All Cisco security advisories are available at http://www.cisco.com/go/psirt.


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