Bug 466079 (CVE-2008-4576)

Summary: CVE-2008-4576 kernel: sctp: Fix oops when INIT-ACK indicates that peer doesn't support AUTH
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: high Docs Contact:
Priority: high    
Version: unspecifiedCC: bhu, dhoward, jpirko, lgoncalv, lwang, pstyles, williams
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
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Clone Of: Environment:
Last Closed: 2010-12-21 17:47:04 UTC Type: ---
Regression: --- Mount Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 466080, 466081, 466082    
Bug Blocks:    
Attachments:
Description Flags
Proposed backport patch for realtime kernel none

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 1 Eugene Teo (Security Response) 2008-10-08 07:24:38 UTC 
Proposed upstream patch:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=add52379dde2e5300e2d574b172e62c6cf43b3d3
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)