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2012-07 Security Bulletin: Junos: rpd crash when receiving malformed IS-IS hello packets

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Article ID: JSA10446 SECURITY_ADVISORIES Last Updated: 09 May 2013Version: 1.0
Legacy Advisory Id:
PSN-2012-07-647
Product Affected:
This issue can affect any Junos router with the IS-IS protocol enabled.
Problem:

Upon receipt of certain malformed/invalid IS-IS hello messages, the rpd daemon may crash. The crash occurs because the packet processing code tries to determine IS-IS details based on the packet's contents, but does not check the bounds of certain values. The value returned is used as an index into an array of pointers, causing the code to dereference a NULL pointer.

This issue only affects routers with interfaces configured for IS-IS ('family iso'), and 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 2012-05-17 have fixed this specific issue. Releases containing the fix specifically include: 10.0S25, 10.4R10, 11.4R3, 12.1R1, and all subsequent releases (i.e. all releases built after 12.1R1).

This issue is being tracked as PR 727347 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.
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."

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