Bug 652517 (CVE-2010-4164)

Summary: CVE-2010-4164 kernel: prevent crashing when parsing bad X.25
Product: [Other] Security Response Reporter: Eugene Teo (Security Response) <eteo>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED ERRATA QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: pmatouse
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
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Fixed In Version: Doc Type: Bug Fix
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Last Closed: 2021-10-19 09:03:08 UTC Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Description Eugene Teo (Security Response) 2010-11-12 05:39:20 UTC 
Description of problem:
On parsing malformed X.25 facilities, decrementing the remaining length
may cause it to underflow.  Since the length is an unsigned integer,
this will result in the loop continuing until the kernel crashes.

This patch adds checks to ensure decrementing the remaining length does
not cause it to wrap around.

http://marc.info/?l=linux-netdev&m=128951543005554&w=2

Acknowledgements:

Red Hat would like to thank Dan Rosenberg for reporting this issue.

Statement:

This issue did not affect the versions of Linux kernel as shipped with Red Hat
Enterprise Linux 4, 5, 6 and Red Hat Enterprise MRG as they did not include
support for CCITT X.25 Packet Layer.
Comment 1 Eugene Teo (Security Response) 2010-11-22 06:19:10 UTC 
Upstream commit:
http://git.kernel.org/linus/5ef41308f94dcbb3b7afc56cdef1c2ba53fa5d2f