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2014-01 Security Bulletin: Junos: Memory-consumption DoS attack possible when xnm-ssl or xnm-clear-text service enabled (CVE-2014-0613)

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Categories:
Security Advisories ID: JSA10607
Last Updated: 09 Jan 2014
Version: 2.0

Product Affected:
This issue can affect any product or platform running Junos OS.

Problem:
When xnm-ssl or xnm-clear-text is enabled within the [edit system services] hierarchy level of the Junos configuration, an unauthenticated, remote user could exploit the XNM command processor to consume excessive amounts of memory. This, in turn, could lead to system instability or other performance issues.

This issue was found during internal product security testing.

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

No other Juniper Networks products or platforms are affected by this issue.
(Be careful about third-party and/or open source software)

This issue has been assigned CVE-2014-0613.

Solution:
The following software releases have been updated to resolve this specific issue:
  • All Junos OS software releases built on or after 2013-12-17, or
  • Junos OS 10.4R16, 11.4R10, 12.1R8-S2, 12.1X44-D30, 12.1X45-D20, 12.1X46-D10, 12.2R7, 12.3R5, 13.1R3-S1, 13.2R2-S2, 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 925478 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 via the Junos XML protocol only from trusted hosts.

In addition to the recommendations listed above, it is good security practice to limit the exploitable attack surface of critical infrastructure networking equipment. Use additional access lists or firewall filters to limit access to the router via ssh or telnet only from trusted, administrative networks or 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:
5.0 (AV:N/AC:L/Au:N/C:N/I:N/A:P)

Risk Level:
Medium

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."

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