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2014-07 Security Bulletin: Junos: SRX flowd denial of service vulnerability in NAT protocol translation (CVE-2014-3817)

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Article ID: JSA10635 SECURITY_ADVISORIES Last Updated: 03 Sep 2014Version: 2.0
Product Affected:
This issue affects all SRX Series devices running Junos OS 11.4, 12.1X44, 12.1X45, or 12.1X46
Problem:
On SRX Series devices, when NAT protocol translation from IPv4 to IPv6 is enabled, a certain crafted packet may cause the flowd process to hang or crash. A hang or repeated crash of the flowd process constitutes an extended denial of service condition for SRX Series devices.

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-2014-3817.
Solution:
The following software releases have been updated to resolve this specific issue: 11.4R12, 12.1X44-D32, 12.1X44-D35, 12.1X45-D25, 12.1X46-D20, 12.1X47-D10, and all subsequent releases (i.e. all releases built after 12.1X47-D10).

This issue is being tracked as PR 954437 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 NAT protocol translation from IPv4 to IPv6 is not required, disabling (by deleting the setting or deactivating) the feature will completely 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.
CVSS Score:
7.8 (AV:N/AC:L/Au:N/C:N/I:N/A:C)
Severity Level:
High
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."
Acknowledgements:
 

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