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2014-07 Security Bulletin: Junos: Malformed packet can cause SRX denial of service when translating traffic from IPv6 to IPv4 (CVE-2014-3822)

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Article ID: JSA10641 SECURITY_ADVISORIES Last Updated: 09 Jul 2014Version: 1.0
Product Affected:
This issue can affect any SRX Series devices running Junos 11.4, 12.1, 12.1X44, 12.1X45, 12.1X46.
Problem:
A denial of service (DoS) issue has been discovered in Juniper SRX Series products that can be exploited by remote unauthenticated attackers. This issue takes place when a certain malformed packet is translated from IPv6 to IPv4. When this malformed packet is sent to a vulnerable SRX Series device, the flowd process may crash. The issue can be repeatedly exploited to create an extended denial of service condition.

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-2014-3822.
Solution:
The following software releases have been updated to resolve this specific issue: Junos OS 11.4R8, 12.1R5, 12.1X44-D20, 12.1X45-D15, 12.1X46-D10, 12.1X47-D10, and all subsequent releases (i.e. all releases built after 12.1X47-D10).

This issue is being tracked as PR 747680 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 IPv6 to IPv4 is not required, disabling 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:
5.4 (AV:N/AC:H/Au:N/C:N/I:N/A:C)
Severity Level:
Medium
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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