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2013-10 Security Bulletin: Junos: Security issue with Proxy ARP enabled on unnumbered interface (CVE-2013-6014)

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Product Affected:
This issue can affect any product or platform running Junos OS 10.4, 11.4, 11.4X27, 12.1, 12.1X44, 12.1X45, 12.2, 12.3, or 13.1, supporting unnumbered interfaces.
If Proxy ARP is enabled on an unnumbered interface, an attacker directly connected to the router can poison the ARP cache and create a bogus forwarding table entry for an IP address, effectively creating a denial of service for that subscriber or interface. When Proxy ARP is enabled on an unnumbered interface, the router will answer any ARP message from any IP address which could lead to exploitable information disclosure.

Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

No other Juniper Networks products or platforms are affected by this issue.

This issue has been assigned CVE-2013-6014.
The following software releases have been updated to resolve this specific issue:
  • All Junos OS software releases built on or after 2013-09-18, or
  • Junos OS 10.4S15, 11.4R9, 11.4X27.44, 12.1R7, 12.1X44-D20, 12.1X45-D15, 12.2R6, 12.3R3, 13.1R3, 13.2R1, and all subsequent releases (i.e. all releases built after 13.2R1).
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 842092 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.
No known workaround exists for this issue.
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:
6.1 (AV:A/AC:L/Au:N/C:N/I:C/A:N)
Risk Level:
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."