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Cisco Security Advisory

Cisco IOS Virtual Private Dial-up Network Denial of Service Vulnerability

Advisory ID: cisco-sa-20080326-pptp

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20080326-pptp

Revision 1.3

For Public Release 2008 March 26 16:00  UTC (GMT)

Related Resources:

View related IPS Signature

Summary

Two vulnerabilities exist in the virtual private dial-up network (VPDN) solution when Point-to-Point Tunneling Protocol (PPTP) is used in certain Cisco IOS releases prior to 12.3. PPTP is only one of the supported tunneling protocols used to tunnel PPP frames within the VPDN solution.

The first vulnerability is a memory leak that occurs as a result of PPTP session termination. The second vulnerability may consume all interface descriptor blocks on the affected device because those devices will not reuse virtual access interfaces. If these vulnerabilities are repeatedly exploited, the memory and/or interface resources of the attacked device may be depleted.

Cisco has made free software available to address these vulnerabilities for affected customers.

There are no workarounds available to mitigate the effects of these vulnerabilities.

This advisory is posted at http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20080326-pptp.

Note: The March 26, 2008 publication includes five security advisories. The advisories all address vulnerabilities in Cisco's IOS software. Each advisory lists the releases that correct the vulnerability described in the advisory, and also lists the releases that correct the vulnerabilities in the other five advisories.

Individual publication links are listed below:

Affected Products

Devices that are running certain Cisco IOS versions prior to 12.3 with VPDN enabled may be affected by these vulnerabilities.

Vulnerable Products

Devices that are running affected versions of Cisco IOS with VPDN enabled and are configured to accept termination of PPTP sessions are vulnerable.

To determine whether VPDN is enabled on your device, log in to the device and issue the command-line interface (CLI) command show running-config. If the output contains vpdn enable along with a vpdn-group <name> command, VPDN is enabled on the device. The device will accept termination of PPTP sessions if the command protocol any or protocol pptp is defined under the vpdn-group <name> command. The following example shows a device that is running VPDN and will accept termination of PPTP sessions:

Router#show running-config 
Building configuration...

!
!--- Output truncated.
!

vpdn enable

!

vpdn-group test_only
! Default PPTP VPDN group
 accept-dialin
  protocol pptp
  virtual-template 1

!
!---Remaining output truncated.

To determine the software version running on a Cisco product, log in to the device and issue the show version command to display the system banner. Cisco IOS software will identify itself as "Internetwork Operating System Software" or simply "IOS." On the next line of output, the image name will be displayed between parentheses, followed by "Version" and the IOS release name. Other Cisco devices will not have the show version command or will give different output.

The following example identifies a Cisco product that is running Cisco IOS release 12.2(7):

Cisco Internetwork Operating System Software 
IOS (tm) 7200 Software (C7200-IS-M), Version 12.2(7), RELEASE SOFTWARE (fc1)
Copyright (c) 1986-2002 by cisco Systems, Inc.
Compiled Tue 15-Jan-02 18:31 by pwade
Image text-base: 0x600089C0, data-base: 0x613A6000

Additional information about Cisco IOS release naming can be found at http://www.cisco.com/warp/public/620/1.html.

Products Confirmed Not Vulnerable

Devices that are running Cisco IOS versions 12.3 and later are not affected by these vulnerabilities. Devices that are explicitly configured for VPDN protocols other than PPTP are not affected.

Devices that are running Cisco IOS versions prior to 12.3 and do not have VPDN enabled are not affected by these vulnerabilities.

Cisco IOS XR is not affected by these vulnerabilities.

Details

VPDNs securely carry private data over a public network, allowing remote users to access a private network over a shared infrastructure such as the Internet. VPDNs maintain the same security and management policies as a private network, while providing a cost-effective method for point-to-point connections between remote users and a central network.

PPTP is a network protocol that enables the secure transfer of data from a remote client to a private enterprise server by creating a VPDN across TCP/IP-based data networks. PPTP supports on-demand, multiprotocol, virtual private networking over public networks, such as the Internet.

Details regarding the two known vulnerabilities in Cisco IOS devices that are running affected versions of system software follow:

  • Memory Leak due to PPTP Session Termination
    Upon completion of a PPTP session, memory is leaked from the processor memory on the terminating device. This is shown in the output of show process memory under the *Dead* process. The *Dead* process is not a real process. Its function is to account for the memory that is allocated under the context of another process which has terminated, in this case PPTP. When the administrator is logged into the device, if the device is under exploitation, the Holding entry of the *Dead* process under the show process memory command will be increasing. Following is an example showing a device that is holding *Dead* memory:
    Router#show process memory 
    Total: 199718560, Used: 11147828, Free: 188570732
     PID TTY  Allocated      Freed    Holding    Getbufs    Retbufs Process
       0   0      99812       1848    8415816          0          0 *Init*          
       0   0        444     778840        444          0          0 *Sched*         
       0   0   17481700    4930848     819672     180908          0 *Dead*          
       1   0        284        284       3828          0          0 Load Meter 
    
    !--- Output truncated.
    
    
    The CLI command show memory dead allows administrators to examine the contents of *Dead*. The output will display many occurrences of PPTP in the output if the PPTP process is causing the leak. The following example shows the dead memory for a device that has been exploited by the vulnerability
    Router#show memory dead
                    Head    Total(b)     Used(b)     Free(b)   Lowest(b)  Largest(b)
    Processor   6225FF40   224002240    11906736   212095504   212082872   212084464
          I/O   20000000    33554440      994136    32560304    32560304    32560252
        I/O-2    F800000     8388616     1020632     7367984     7367984     7367932
    
    
    
    
              Processor memory
    
     Address      Bytes     Prev     Next Ref    PrevF   NextF Alloc PC  what
    62275DC8 0000000048 62275D68 62275E24 001  ------- ------- 60654230  PPTP create idb
    62275E24 0000000052 62275DC8 62275E84 001  ------- ------- 60654230  PPTP create idb
    62275E84 0000000052 62275E24 62275EE4 001  ------- ------- 60654230  PPTP create idb
    ....
    
    !--- remaining output truncated.
    
    
    This vulnerability is documented in Cisco bug ID CSCsj58566 ( registered customers only) and Common Vulnerabilities and Exposures (CVE) identifier CVE-2008-1151 has been assigned to this vulnerability.

  • Virtual Access Interfaces Are Not Re-used
    Upon completion of a PPTP session, affected devices do not remove the virtual access interface that is associated with the PPTP session and do not reuse the interfaces in any future connections.

    This situation can result in an exhaustion of the interface descriptor block (IDB) limit, which will prevent any new interfaces being created within Cisco IOS, effectively blocking all new VPDN connections, even though the router may still have enough processor memory to remain up and running. A reload of the device is required to remove the interfaces.

    An IDB is a Cisco IOS internal data structure that contains information such as the IP address, interface state, and packet statistics. Cisco IOS software maintains one IDB for each interface present on a platform and one IDB for each subinterface.

    Further documentation on Cisco IOS IDBs can be found at: http://www.cisco.com/en/US/products/sw/iosswrel/ps1835/products_tech_note09186a0080094322.shtml

    This vulnerability is documented in Cisco bug ID CSCdv59309 ( registered customers only) and Common Vulnerabilities and Exposures (CVE) identifier CVE-2008-1150 has been assigned to this vulnerability.

Vulnerability Scoring Details

Cisco is providing 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.

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

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

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.

CSCsj58566 ( registered customers only) - Memory Leak due to PPTP Session Termination

Calculate the environmental score of CSCsj58566

CVSS Base Score - 7.1

Access Vector

Access Complexity

Authentication

Confidentiality Impact

Integrity Impact

Availability Impact

Network

Medium

None

None

None

Complete

CVSS Temporal Score - 5.9

Exploitability

Remediation Level

Report Confidence

Functional

Official-Fix

Confirmed

CSCdv59309 ( registered customers only) - Virtual Access Interfaces Are Not Re-used

Calculate the environmental score of CSCdv59309

CVSS Base Score - 4.3

Access Vector

Access Complexity

Authentication

Confidentiality Impact

Integrity Impact

Availability Impact

Network

Medium

None

None

None

Partial

CVSS Temporal Score - 3.6

Exploitability

Remediation Level

Report Confidence

Functional

Official-Fix

Confirmed

Impact

Successful exploitation of the vulnerability may result in a memory leak of processor memory or consumption of all available IDBs on the device. With continued exploitation, the device will deplete its processor memory or reach an IDB limit. Both impacts would result in a denial of service condition for the device.

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

Not Vulnerable

12.0DA

Not Vulnerable

12.0DB

Not Vulnerable

12.0DC

Not Vulnerable

12.0S

Not Vulnerable

12.0SC

Not Vulnerable

12.0SL

Not Vulnerable

12.0SP

Not Vulnerable

12.0ST

Not Vulnerable

12.0SX

Not Vulnerable

12.0SY

Not Vulnerable

12.0SZ

Not Vulnerable

12.0T

Not Vulnerable

12.0W

Not Vulnerable

12.0WC

Not Vulnerable

12.0WT

Not Vulnerable

12.0XA

Not Vulnerable

12.0XB

Not Vulnerable

12.0XC

Not Vulnerable

12.0XD

Not Vulnerable

12.0XE

Releases prior to 12.0(7)XE2 are vulnerable, release 12.0(7)XE2 and later are not vulnerable;

12.0XF

Not Vulnerable

12.0XG

Not Vulnerable

12.0XH

Not Vulnerable

12.0XI

Not Vulnerable

12.0XJ

Not Vulnerable

12.0XK

Not Vulnerable

12.0XL

Not Vulnerable

12.0XM

Not Vulnerable

12.0XN

Not Vulnerable

12.0XQ

Not Vulnerable

12.0XR

Not Vulnerable

12.0XS

Not Vulnerable

12.0XV

Not Vulnerable

12.0XW

Not Vulnerable

Affected 12.1-Based Releases

First Fixed Release

Recommended Release

12.1

Not Vulnerable

12.1AA

Not Vulnerable

12.1AX

Not Vulnerable

12.1AY

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

12.1(22)EA11

12.1AZ

Not Vulnerable

12.1CX

Not Vulnerable

12.1DA

Not Vulnerable

12.1DB

Not Vulnerable

12.1DC

Vulnerable; first fixed in 12.2B

12.4(18a)

12.1E

Vulnerable; contact TAC

12.1EA

Releases prior to 12.1(11)EA1 are vulnerable, release 12.1(11)EA1 and later are not vulnerable;

12.1(22)EA11

12.1EB

Not Vulnerable

12.1EC

Vulnerable; first fixed in 12.2BC

12.3(23)BC1

12.1EO

Not Vulnerable

12.1EU

Not Vulnerable

12.1EV

Not Vulnerable

12.1EW

Not Vulnerable

12.1EX

Vulnerable; contact TAC

12.1EY

Not Vulnerable

12.1EZ

Vulnerable; contact TAC

12.1GA

Not Vulnerable

12.1GB

Not Vulnerable

12.1T

Vulnerable; migrate to any release in 12.3

12.3(26)

12.1XA

Not Vulnerable

12.1XB

Not Vulnerable

12.1XC

Not Vulnerable

12.1XD

Not Vulnerable

12.1XE

Not Vulnerable

12.1XF

Not Vulnerable

12.1XG

Not Vulnerable

12.1XH

Not Vulnerable

12.1XI

Not Vulnerable

12.1XJ

Vulnerable; first fixed in 12.2T

12.3(26)

12.1XK

Not Vulnerable

12.1XL

Vulnerable; first fixed in 12.2T

12.3(26)

12.1XM

Vulnerable; first fixed in 12.2T

12.3(26)

12.1XN

Not Vulnerable

12.1XO

Not Vulnerable

12.1XP

Vulnerable; first fixed in 12.2T

12.3(26)

12.1XQ

Vulnerable; first fixed in 12.2T

12.3(26)

12.1XR

Vulnerable; first fixed in 12.2T

12.3(26)

12.1XS

Vulnerable; migrate to any release in 12.3

12.3(26)

12.1XT

Vulnerable; first fixed in 12.2T

12.3(26)

12.1XU

Not Vulnerable

12.1XV

Vulnerable; first fixed in 12.2XB

12.3(26)

12.1XW

Not Vulnerable

12.1XX

Not Vulnerable

12.1XY

Vulnerable; migrate to any release in 12.3

12.3(26)

12.1XZ

Not Vulnerable

12.1YA

Vulnerable; first fixed in 12.2T

12.3(26)

12.1YB

Vulnerable; first fixed in 12.2T

12.3(26)

12.1YC

Vulnerable; first fixed in 12.2T

12.3(26)

12.1YD

Vulnerable; first fixed in 12.2T

12.3(26)

12.1YE

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

12.3(26)

12.1YF

Vulnerable; first fixed in 12.2T

12.3(26)

12.1YG

Not Vulnerable

12.1YH

Not Vulnerable

12.1YI

Vulnerable; first fixed in 12.2T

12.3(26)

12.1YJ

Not Vulnerable

Affected 12.2-Based Releases

First Fixed Release

Recommended Release

12.2

Vulnerable; migrate to any release in 12.3

12.3(26)

12.2B

12.2(4)B5

12.4(18a)

12.2BC

12.2(15)BC1e

12.2(15)BC2d

12.2(8)BC1

12.3(23)BC1

12.2BW

12.2(4)BW1

12.2(4)BW1a

12.3(26)

12.2BY

12.2(8)BY

12.4(18a)

12.2BZ

Not Vulnerable

12.2CX

Not Vulnerable

12.2CY

Not Vulnerable

12.2CZ

Not Vulnerable

12.2DA

Vulnerable; contact TAC

12.2DD

Vulnerable; first fixed in 12.2B

12.4(18a)

12.2DX

Vulnerable; first fixed in 12.2B

12.4(18a)

12.2EU

Not Vulnerable

12.2EW

Not Vulnerable

12.2EWA

Not Vulnerable

12.2EX

Not Vulnerable

12.2EY

Not Vulnerable

12.2EZ

Not Vulnerable

12.2FX

Not Vulnerable

12.2FY

Not Vulnerable

12.2FZ

Not Vulnerable

12.2IXA

Not Vulnerable

12.2IXB

Not Vulnerable

12.2IXC

Not Vulnerable

12.2IXD

Not Vulnerable

12.2IXE

Not Vulnerable

12.2JA

Not Vulnerable

12.2JK

Not Vulnerable

12.2MB

Not Vulnerable

12.2MC

Not Vulnerable

12.2S

Releases prior to 12.2(18)S are vulnerable, release 12.2(18)S and later are not vulnerable; migrate to any release in 12.2SRC

12.2(25)S15

12.2SB

Not Vulnerable

12.2SBC

Not Vulnerable

12.2SCA

Not Vulnerable

12.2SE

Not Vulnerable

12.2SEA

Not Vulnerable

12.2SEB

Not Vulnerable

12.2SEC

Not Vulnerable

12.2SED

Not Vulnerable

12.2SEE

Not Vulnerable

12.2SEF

Not Vulnerable

12.2SEG

Not Vulnerable

12.2SG

Not Vulnerable

12.2SGA

Not Vulnerable

12.2SL

Not Vulnerable

12.2SM

Not Vulnerable

12.2SO

Not Vulnerable

12.2SRA

Not Vulnerable

12.2SRB

Not Vulnerable

12.2SRC

Not Vulnerable

12.2SU

Vulnerable; migrate to any release in 12.3T

12.4(18a)

12.2SV

Not Vulnerable

12.2SVA

Not Vulnerable

12.2SVC

Not Vulnerable

12.2SVD

Not Vulnerable

12.2SW

Not Vulnerable

12.2SX

Releases prior to 12.2(17a)SX are vulnerable, release 12.2(17a)SX and later are not vulnerable; migrate to any release in 12.2SXF

12.2(18)SXF13

12.2SXA

Not Vulnerable

12.2SXB

Not Vulnerable

12.2SXD

Not Vulnerable

12.2SXE

Not Vulnerable

12.2SXF

Not Vulnerable

12.2SXH

Not Vulnerable

12.2SY

Vulnerable; migrate to any release in 12.2SXB

12.2(18)SXF13

12.2SZ

Vulnerable; migrate to any release in 12.2SRC

12.2(25)S15

12.2(31)SB11

12.2(33)SRC

12.2T

12.2(15)T4e

12.2(8)T

12.3(26)

12.2TPC

Not Vulnerable

12.2UZ

Not Vulnerable

12.2XA

Vulnerable; first fixed in 12.2T

12.3(26)

12.2XB

12.2(2)XB5

12.3(26)

12.2XC

Vulnerable; migrate to any release in 12.3T

12.4(18a)

12.2XD

Vulnerable; first fixed in 12.2T

12.3(26)

12.2XE

Vulnerable; first fixed in 12.2T

12.3(26)

12.2XF

Vulnerable; first fixed in 12.2BC

12.3(23)BC1

12.2XG

Vulnerable; first fixed in 12.2T

12.3(26)

12.2XH

Vulnerable; first fixed in 12.2T

12.3(26)

12.2XI

Vulnerable; first fixed in 12.2T

12.3(26)

12.2XJ

Vulnerable; first fixed in 12.2T

12.3(26)

12.2XK

Vulnerable; first fixed in 12.2T

12.3(26)

12.2XL

Not Vulnerable

12.2XM

Not Vulnerable

12.2XN

Not Vulnerable

12.2XO

Not Vulnerable

12.2XQ

Vulnerable; first fixed in 12.2T

12.3(26)

12.2XR

Not Vulnerable

12.2XS

Vulnerable; first fixed in 12.2T

12.3(26)

12.2XT

Vulnerable; first fixed in 12.2T

12.3(26)

12.2XU

Vulnerable; migrate to any release in 12.3

12.3(26)

12.2XV

Vulnerable; migrate to any release in 12.3

12.3(26)

12.2XW

Not Vulnerable

12.2YA

Not Vulnerable

12.2YB

Not Vulnerable

12.2YC

Vulnerable; first fixed in 12.2T

12.3(26)

12.2YD

Not Vulnerable

12.2YE

Vulnerable; migrate to any release in 12.2SRC

12.2(25)S15

12.2(31)SB11

12.2(33)SRC

12.2YF

Not Vulnerable

12.2YG

Not Vulnerable

12.2YH

Not Vulnerable

12.2YJ

Not Vulnerable

12.2YK

Not Vulnerable

12.2YL

Not Vulnerable

12.2YM

Not Vulnerable

12.2YN

Not Vulnerable

12.2YO

Vulnerable; migrate to any release in 12.2SXB

12.2(18)SXF13

12.2YP

Not Vulnerable

12.2YQ

Not Vulnerable

12.2YR

Not Vulnerable

12.2YS

Not Vulnerable

12.2YT

Not Vulnerable

12.2YU

Not Vulnerable

12.2YV

Not Vulnerable

12.2YW

Not Vulnerable

12.2YX

Vulnerable; migrate to any release in 12.3T

12.4(18a)

12.2YY

Not Vulnerable

12.2YZ

Vulnerable; migrate to any release in 12.2SRC

12.2(25)S15

12.2(31)SB11

12.2(33)SRC

12.2ZA

Vulnerable; migrate to any release in 12.2SXB

12.2(18)SXF13

12.2ZB

Not Vulnerable

12.2ZC

Not Vulnerable

12.2ZD

Not Vulnerable

12.2ZE

Not Vulnerable

12.2ZF

Not Vulnerable

12.2ZG

Not Vulnerable

12.2ZH

Not Vulnerable

12.2ZJ

Not Vulnerable

12.2ZL

Not Vulnerable

12.2ZP

Not Vulnerable

12.2ZU

Not Vulnerable

12.2ZY

Not Vulnerable

Affected 12.3-Based Releases

First Fixed Release

Recommended Release

There are no affected 12.3 based releases

Affected 12.4-Based Releases

First Fixed Release

Recommended Release

There are no affected 12.4 based releases


Workarounds

There are no workarounds for these vulnerabilities. Cisco recommends upgrading to the fixed version of Cisco IOS.

Obtaining Fixed Software

Cisco will make free software available to address these vulnerabilities for affected customers. This advisory will be updated as fixed software becomes available. 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/public/sw-license-agreement.html , or as otherwise set forth at Cisco.com Downloads at http://www.cisco.com/public/sw-center/sw-usingswc.shtml.

Do not contact either "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 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 Using Third-Party Support Organizations

Customers whose Cisco products are provided or maintained through prior or existing agreement 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 who do not hold a Cisco service contract and customers who purchase through third-party vendors but are unsuccessful at obtaining fixed software through their point of sale should get their 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

Have your product serial number available and give the URL of this notice as evidence of your 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 special 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 vulnerability described in this advisory.

We would like to thank Martin Kluge of Elxsi Security for reporting these vulnerabilities to us. We greatly appreciate the opportunity to work with researchers on security vulnerabilities, and welcome the opportunity to review and assist with security vulnerability reports against Cisco products.

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://www.cisco.com/warp/public/707/cisco-sa-20080206-pptp.shtml

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-teams@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 1.2

2008-June-27

Updated Summary to remove link and verbiage.

Revision 1.1

2008-March-29

Updated Software Table for 12.0S, 12.0SY, 12.0SX and 12.0SZ due to new information on advisory ID cisco-sa-20080326-IPv4IPv6, the March 26th advisory on IPv4IPv6 Dual Stack Routers.

Revision 1.0

2008-March-26

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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