Bug 466079 (CVE-2008-4576) - CVE-2008-4576 kernel: sctp: Fix oops when INIT-ACK indicates that peer doesn't support AUTH
Summary: CVE-2008-4576 kernel: sctp: Fix oops when INIT-ACK indicates that peer doesn'...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2008-4576
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 466080 466081 466082
Blocks:
TreeView+ depends on / blocked
 
Reported: 2008-10-08 07:22 UTC by Eugene Teo (Security Response)
Modified: 2019-09-29 12:26 UTC (History)
7 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2010-12-21 17:47:04 UTC
Embargoed:


Attachments (Terms of Use)
Proposed backport patch for realtime kernel (1.54 KB, patch)
2008-10-08 08:10 UTC, Eugene Teo (Security Response)
no flags Details | Diff


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2008:1017 0 normal SHIPPED_LIVE Important: kernel security and bug fix update 2008-12-16 07:33:56 UTC
Red Hat Product Errata RHSA-2009:0009 0 normal SHIPPED_LIVE Important: kernel security and bug fix update 2009-01-22 10:43:54 UTC

Description Eugene Teo (Security Response) 2008-10-08 07:22:58 UTC
Description of problem:
If INIT-ACK is received with SupportedExtensions parameter which indicates that the peer does not support AUTH, the packet will be silently ignore, and sctp_process_init() do cleanup all of the transports in the association. When T1-Init timer is expires, OOPS happen while we try to choose a different init transport.

The solution is to only clean up the non-active transports, i.e the ones that the peer added.  However, that introduces a problem with sctp_connectx(), because we don't mark the proper state for the transports provided by the user.  So, we'll simply mark user-provided transports as ACTIVE.  That will allow INIT retransmissions to work properly in the sctp_connectx() context and prevent the crash.

Comment 2 Eugene Teo (Security Response) 2008-10-08 07:26:11 UTC
Reference:
http://article.gmane.org/gmane.comp.security.oss.general/1039

Comment 4 Eugene Teo (Security Response) 2008-10-08 08:10:12 UTC
Created attachment 319734 [details]
Proposed backport patch for realtime kernel

Comment 5 Fedora Update System 2008-10-23 16:38:01 UTC
kernel-2.6.26.6-49.fc8 has been pushed to the Fedora 8 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 6 Luis Claudio R. Goncalves 2008-10-29 00:24:15 UTC
MRG patch added to -90

Comment 9 Vincent Danen 2010-12-21 17:47:04 UTC
This was addressed via:

Red Hat Enterprise Linux version 5 (RHSA-2008:1017)
MRG Realtime for RHEL 5 Server (RHSA-2009:0009)


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