PT-2013-1009 · Cisco · Cisco Ios

Published 2013-09-25 · Updated 2013-10-07 · CVE-2013-5474

Positive Technologies (AI Summary)

CVSS v2.0

7.8

High

Base vector

AV:N/AC:L/Au:N/C:N/I:N/A:C

Name of the Vulnerable Software and Affected Versions Cisco IOS versions 12.2 through 12.4 Cisco IOS versions 15.0 through 15.3

Description The issue is caused by a race condition in the IPv6 virtual fragmentation reassembly (VFR) implementation, allowing a remote attacker to cause a denial of service (device reload or hang) via fragmented IPv6 packets. An attacker could exploit this by sending a crafted stream of valid IPv6 fragments, potentially resulting in a sustained denial of service condition.

Recommendations For Cisco IOS versions 12.2 through 12.4, update to a fixed version to address the vulnerability. For Cisco IOS versions 15.0 through 15.3, update to a fixed version to address the vulnerability. As a temporary workaround, consider restricting access to the VFR feature for IPv6 until a patch is available.

Fix

DoS

Race Condition

Weakness Enumeration

CWE-362

Related Identifiers

BDU:2014-00043

CVE-2013-5474

Affected Products

Cisco Ios

References · 4

• https://bdu.fstec.ru/vul/2014-00043 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2013-5474 · Security Note
• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20130925-ipv6vfr · Vendor Advisory
• http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20130925-ipv6vfr · Vendor Advisory