Bug 463661 (CVE-2008-4210)

Summary: CVE-2008-4210 kernel: open() call allows setgid bit when user is not in new file's group
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: buckh, dhoward, esandeen, jpirko, lwang, peterm, pstyles, qcai, vgoyal
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2010-12-21 17:41:49 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 463682, 463683, 463684, 463685, 463686, 463687, 463865, 463867    
Bug Blocks:    
Attachments:
Description Flags
Reproducer (public) none

Description Eugene Teo (Security Response) 2008-09-24 05:40:37 UTC 
Description of problem:
When creating a file, open()/creat() allows the setgid bit to be set via the mode argument even when, due to the bsdgroups mount option or the file being created in a setgid directory, the new file's group is one which the user is not a member of.  The user can then use ftruncate() and memory-mapped I/O to turn the new file into an arbitrary binary and thus gain the privileges of this group, since these operations do not clear the setgid bit.
Comment 1 Eugene Teo (Security Response) 2008-09-24 06:06:59 UTC 
Reference:
http://bugzilla.kernel.org/show_bug.cgi?id=8420
Comment 2 Eugene Teo (Security Response) 2008-09-24 06:13:00 UTC 
Created attachment 317560 [details]
Reproducer (public)
Comment 7 Eugene Teo (Security Response) 2008-09-24 10:30:34 UTC 
Proposed upstream patch:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=7b82dc0e64e93f430182f36b46b79fcee87d3532
Comment 8 Eugene Teo (Security Response) 2008-09-24 10:37:04 UTC 
Additional references:
http://article.gmane.org/gmane.comp.security.oss.general/974
Comment 13 Eugene Teo (Security Response) 2008-09-26 04:02:39 UTC 
(In reply to comment #7)
> Proposed upstream patch:
> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=7b82dc0e64e93f430182f36b46b79fcee87d3532

This should include commit 01de85e057328ecbef36e108673b1e81059d54c1 as well.
Comment 18 Eugene Teo (Security Response) 2008-10-07 01:14:28 UTC 
http://marc.info/?l=linux-kernel&m=101812479210977&w=2
Comment 19 Eugene Teo (Security Response) 2008-10-07 01:18:39 UTC 
(In reply to comment #18)
> http://marc.info/?l=linux-kernel&m=101812479210977&w=2

More references:
http://marc.info/?l=linux-kernel&m=101811359004161&w=2
http://marc.info/?l=linux-kernel&m=101811887207549&w=2
Comment 21 Buck Huppmann 2008-11-12 22:44:04 UTC 
is there a RHSA coming for this for RH 4, a la

http://www.redhat.com/support/errata/RHSA-2008-0957.html
Comment 24 Vincent Danen 2010-12-21 17:41:49 UTC 
This was addressed via:

Red Hat Linux Advanced Workstation 2.1 (RHSA-2008:0787)
Red Hat Enterprise Linux version 5 (RHSA-2008:0957)
Red Hat Enterprise Linux version 4 (RHSA-2008:0972)
Red Hat Enterprise Linux version 3 (RHSA-2008:0973)
Red Hat Enterprise Linux version 2.1 (RHSA-2009:0001)