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2012-07 Security Bulletin: Junos: flowd core when processing non-first IP fragmented packets

  [JSA10524] Show Article Properties


Legacy Advisory Id:
PSN-2012-07-652
Product Affected:
This issue can affect all multi-data threaded SRX Series services gateways, including the Branch SRX 240, SRX 550, and SRX 650, and all Data Center SRX Series services gateways.
Problem:

When processing fragmented IP traffic sent to a multi-data threaded SRX Series services gateway, the flowd process may crash when trying to reassemble IP fragments. The issue is due to a logic error in the IP fragment reassembly module. A race condition can exist within the debug info process which can read an invalid pointer causing the flowd process to core.

Note that the SRX 100, 110, 210 and 220 services gateways for the Branch and the J Series services gateway all use a single data thread and are not affected by this vulnerability.

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.
Solution:

All Junos OS software releases built on or after 2012-06-01 have fixed this specific issue. Releases containing the fix specifically include: 10.0S26, 10.4S7, 10.4R8, 11.2R1, 11.3R1, 11.4R1 and all subsequent releases (i.e. all releases built after 11.4R1).

This issue is being tracked as PR 597883 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:

No known workaround exists for 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:
5.7 (AV:A/AC:M/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."