2014-01 Security Bulletin: Junos: GNU libc ‘regcomp()’ Stack Exhaustion Denial Of Service Vulnerability (CVE-2010-4051, CVE-2010-4052)
Product Affected:This issue can affect any product or platform running Junos OS.
Problem:A stack consumption vulnerability in the regcomp implementation in the GNU C Library allows an attacker to cause a denial of service (resource exhaustion) via a regular expression containing adjacent repetition operators or adjacent bounded repetitions. Junos uses regular expressions in several places within the CLI. Exploitation of this vulnerability can cause the RE to crash and rpd application leading to a partial denial of service. Repeated exploitation can result in an extended partial outage of services provided by rpd.Juniper SIRT is not aware of any malicious exploitation of this vulnerability.This class of issue has been assigned CVE-2010-4051 and CVE-2010-4052.
Solution:The following software releases have been updated to resolve this specific issue:All Junos OS software releases built on or after 2013-12-12, orJunos OS 10.4S15, 10.4R16, 11.4R9-S1, 11.4R10, 12.1R8, 12.1X44-D25, 12.1X45-D15, 12.1X46-D10, 12.2R6, 12.3R4, 13.1R3-S1, 13.2R2, 13.3R1, and all subsequent releases (i.e. all releases built after 13.3R1).Customers can confirm the build date of any Junos OS release by issuing the command ‘show version detail’.This issue is being tracked as PR 705445 and is visible on the Customer Support website.KB16765 – “In which releases are vulnerabilities fixed?” describes which release vulnerabilities are fixed as per our End of Engineering and End of Life support policies.
Workaround:Use access lists or firewall filters to limit access to the router CLI only from trusted hosts.
Implementation:How to obtain fixed software:Security vulnerabilities in Junos are fixed in the next available Maintenance Release of each supported Junos version. In some cases, a Maintenance Release is not planned to be available in an appropriate time-frame. For these cases, Service Releases are made available in order to be more timely. Security Advisory and Security Notices will indicate which Maintenance and Service Releases contain fixes for the issues described. Upon request to JTAC, customers will be provided download instructions for a Service Release. Although Juniper does not provide formal Release Note documentation for a Service Release, a list of “PRs fixed” can be provided on request.
Related Links: CVSS Score:4.6 (AV:L/AC:L/Au:N/C:P/I:P/A:P)
Risk Assessment:Information for how Juniper Networks uses CVSS can be found at KB 16446 “Common Vulnerability Scoring System (CVSS) and Juniper’s Security Advisories.”