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2013-07 Security Bulletin: Junos: SRX buffer overflow vulnerability in flowd while processing HTTP protocol messages in a UAC environment (CVE-2013-4685)

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Product Affected:
This issue can affect any SRX Series Services Gateway running Junos OS 10.4, 11.4 12.1, or 12.1X44, acting as a UAC enforcer with Captive Portal enabled
A buffer overflow vulnerability affects the flowd process while processing HTTP protocol messages. This may allow arbitrary code execution on an SRX device using crafted HTTP requests. This issue can be triggered when the SRX Series device is acting as a Unified Access Control (UAC) enforcer in a UAC network with Captive Portal enabled.

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 is being tracked publicly as CVE-2013-4685.
All Junos OS software releases built on or after 2013-06-20 have fixed this specific issue. Releases containing the fix specifically include: 10.4S14, 11.4R7, 12.1R6, 12.1X44-D15, and all subsequent releases (i.e. all releases built after 12.1X44-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 849100 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:
10.0 (AV:N/AC:L/Au:N/C:C/I:C/A:C)
Severity Level:
Severity Assessment:
Information for how Juniper Networks uses CVSS can be found at KB 16446 "Common Vulnerability Scoring System (CVSS) and Juniper's Security Advisories."