PT-2015-1408 · Cisco · Cisco Ios

Published 2015-06-27 · Updated 2016-12-28 · CVE-2015-4199

Positive Technologies (AI Summary)

CVSS v2.0

7.1

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Cisco IOS version 15.3S

Description The issue is caused by a race condition in the IPv6-to-IPv4 functionality in the Performance Routing Engine (PRE) module. This allows remote attackers to cause a denial of service by triggering intermittent connectivity with many IPv6 CPE devices. The exploitation of this issue may result in a NULL pointer free and module crash.

Recommendations For Cisco IOS version 15.3S, consider disabling the IPv6-to-IPv4 functionality in the Performance Routing Engine (PRE) module as a temporary workaround until a patch is available. Restrict access to the PRE module to minimize the risk of exploitation. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Race Condition

Weakness Enumeration

CWE-362

Related Identifiers

BDU:2015-10503

CVE-2015-4199

Affected Products

Cisco Ios

References · 5

• http://tools.cisco.com/security/center/viewAlert.x?alertId=39423 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2015-4199 · Security Note
• https://bdu.fstec.ru/vul/2015-10503 · Security Note
• http://securityfocus.com/bid/75335 · Note
• http://securitytracker.com/id/1032692 · Note