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2013-10 Security Bulletin: Junos: SRX flowd crash when processing a certain valid sequence of TCP packets (CVE-2013-6015)

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Categories:
Security Advisories ID: JSA10596
Last Updated: 09 Oct 2013
Version: 1.0

Product Affected:
SRX Series services gateways running Junos OS versions 10.4, 11.4, 12.1, 12.1X44, or 12.1X45.

Problem:
On SRX Series services gateways, when plugins that use TCP proxy are configured (e.g. ALGs, UTM), a certain sequence of valid TCP packets may cause the flow daemon (flowd) to crash. Repeated crashes of flowd can represent an extended denial of service condition for the gateway.

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-2013-6015.

Solution:
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 10.4S14, 11.4R5-S2, 11.4R6, 12.1R3, 12.1X44-D20, 12.1X45-D15, and all subsequent releases (i.e. all releases built after 12.1X45-D15).
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 791201 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:
If ALGs and/or UTM features are not required, disabling ALGs and UTM features will mitigate this issue.

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:
7.8 (AV:N/AC:L/Au:N/C:N/I:N/A:C)

Risk Level:
High

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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