Vulnerability Alert

Cisco IOS and IOS XE Software Resource Reservation Protocol Denial of Service Vulnerability

 
Threat Type:CWE-119: Buffer Errors
IntelliShield ID:28645
Version:2
First Published:2013 March 27 16:21 GMT
Last Published:2013 April 15 21:01 GMT
Port: Not available
CVE:CVE-2013-1143
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
CVSS Base:7.1 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:5.9
 
Version Summary:IntelliShield has updated this alert to add affected products related to the Cisco IOS and IOS XE Software Resource Reservation Protocol denial of service vulnerability.
 
 
Description
The Cisco IOS and IOS XE Resource Reservation Protocol (RSVP) component contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition.

The vulnerability is due to improper handling of malicious RSVP packets. An unauthenticated, remote attacker could exploit this vulnerability by sending crafted RSVP messages through a targeted device. A successful exploit could allow the attacker to cause the device to reload. A sustained attack could cause the device to repeatedly reload and result in a sustained DoS condition for legitimate users.
 
Warning Indicators
Cisco has published a list of affected Cisco IOS and IOS XE Software releases in the security advisory. The Vendor Announcements section of this alert contains a link to the advisory.
 
IntelliShield Analysis
An attacker must be able to send malicious packets to the targeted device to exploit the vulnerability and may require access to trusted, internal networks. This access requirement may reduce the likelihood of a successful attack.

Only traffic destined to the device can trigger the vulnerability; transit traffic is not an exploit vector.

Cisco indicates through the CVSS score that functional exploit code exists; however, the code is not known to be publicly available.
 
Vendor Announcements
Cisco has released a security advisory for bug ID CSCtg39957 at the following link: cisco-sa-20130327-rsvp
 
Impact
An unauthenticated, remote attacker could exploit this vulnerability by to cause a targeted device to reload. A sustained attack could cause the device to repeatedly reload and result in a sustained DoS condition for legitimate users.
 
Technical Information
The vulnerability is due to improper handling of malicious RSVP packets on a device that has Multiprotocol Label Switching Traffic Engineering (MPLS-TE) enabled.

An unauthenticated, remote attacker could exploit this vulnerability by sending crafted RSVP messages through a targeted device that has MPLS-TE. When the malicious RSVP messages are processed by the affected software, the device could reload. A successful exploit could allow the attacker to cause the device to reload. A sustained attack could cause the device to repeatedly reload and result in a sustained DoS condition for legitimate users.
 
Safeguards
Administrators are advised to apply the appropriate updates.

Administrators are advised to allow only trusted users to have network access.

Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems.

Apply hardware rate limiter features to limit packets that require processing by the device's CPU to mitigate DoS attacks. See the vendor documentation for specific configuration instructions.

Administrators are advised to monitor critical systems.
 
Patches/Software
Cisco customers with active contracts can obtain updates through the Software Center at the following link: Cisco. Cisco customers without contracts can obtain upgrades by contacting the Cisco Technical Assistance Center at 1-800-553-2447 or 1-408-526-7209 or via e-mail at tac@cisco.com.
 
Alert History
 

Version 1, March 27, 2013, 4:21 PM: The Cisco IOS and IOS XE Resource Reservation Protocol component contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service condition on a targeted device. Updates are available.



Product Sets
 
The security vulnerability applies to the following combinations of products.

Primary Products:
CiscoCisco IOS XE Software 3.1S .0, .1, .2, .3 | 3.2S .0, .1, .2 | 3.3S .0, .1, .2 | 3.4S .0, .1, .2, .3, .4 | 3.5S Base, .0, .1, .2 | 3.6S Base, .0, .1, .2 | 3.7S Base, .0, .1

Associated Products:
CiscoIOS 12.2EX 12.2(58)EX | 12.2EZ 12.2(58)EZ | 12.2SE 12.2(58)SE2 | 12.2SRE 12.2(33)SRE, 12.2(33)SRE0a, 12.2(33)SRE1, 12.2(33)SRE2, 12.2(33)SRE3, 12.2(33)SRE4, 12.2(33)SRE5, 12.2(33)SRE6, 12.2(33)SRE7, 12.2(33)SRE7a | 12.2ZI 12.2(33)ZI | 15.0MR 15.0(1)MR, 15.0(2)MR | 15.0S 15.0(1)S, 15.0(1)S1, 15.0(1)S2, 15.0(1)S3a, 15.0(1)S4, 15.0(1)S4a, 15.0(1)S5, 15.0(1)S6 | 15.1EY 15.1(2)EY, 15.1(2)EY1, 15.1(2)EY1a, 15.1(2)EY2, 15.1(2)EY2a, 15.1(2)EY3, 15.1(2)EY4 | 15.1MR 15.1(1)MR, 15.1(1)MR1, 15.1(1)MR2, 15.1(1)MR3, 15.1(1)MR4, 15.1(1)MR5, 15.1(3)MR | 15.1MRA 15.1(3)MRA | 15.1S 15.1(1)S, 15.1(1)S1, 15.1(1)S2, 15.1(2)S, 15.1(2)S1, 15.1(2)S2, 15.1(3)S, 15.1(3)S0a, 15.1(3)S1, 15.1(3)S2, 15.1(3)S3, 15.1(3)S4 | 15.1SA 15.1(1)SA, 15.1(1)SA1, 15.1(1)SA2 | 15.1SNG 15.1(2)SNG | 15.1SNH 15.1(2)SNH, 15.1(2)SNH1 | 15.1SNI 15.1(2)SNI | 15.1SY 15.1(1)SY | 15.2S 15.2(1)S, 15.2(1)S1, 15.2(1)S2, 15.2(2)S, 15.2(2)S0a, 15.2(2)S0b, 15.2(2)S0c, 15.2(2)S0d, 15.2(2)S1, 15.2(2)S2, 15.2(4)S, 15.2(4)S0c, 15.2(4)S0xb, 15.2(4)S1 | 15.2SA 15.2(1)SA | 15.2SB 15.2(1)SB, 15.2(1)SB1, 15.2(1)SB2, 15.2(1)SB3, 15.2(1)SB4 | 15.2SC 15.2(1)SC, 15.2(1)SC1 | 15.2SNG 15.2(2)SNG | 15.2SNH 15.2(2)SNH, 15.2(2)SNH1




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The urgency and severity ratings of this alert are not tailored to individual users; users may value alerts differently based upon their network configurations and circumstances. THE ALERT, AND INFORMATION CONTAINED THEREIN, ARE PROVIDED ON AN "AS IS" BASIS AND DO NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE ALERT, AND INFORMATION CONTAINED THEREIN, OR MATERIALS LINKED FROM THE ALERT, IS AT YOUR OWN RISK. INFORMATION IN THIS ALERT AND ANY RELATED COMMUNICATIONS IS BASED ON OUR KNOWLEDGE AT THE TIME OF PUBLICATION AND IS SUBJECT TO CHANGE WITHOUT NOTICE. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE ALERTS AT ANY TIME.
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