Bug 1146791 (CVE-2014-7186)

Summary: CVE-2014-7186 bash: parser can allow out-of-bounds memory access while handling redir_stack
Product: [Other] Security Response Reporter: Wade Mealing <wmealing>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED ERRATA QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: acathrow, alonbl, bazulay, bmcclain, carnil, collura, dblechte, dgregor, ecohen, fdeutsch, fweimer, gmollett, idith, iheim, jgreguske, jrusnack, lpeer, lsurette, michal.skrivanek, mjc, nobody, ooprala, pmatouse, sardella, security-response-team, yeylon
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
It was discovered that the fixed-sized redir_stack could be forced to overflow in the Bash parser, resulting in memory corruption, and possibly leading to arbitrary code execution when evaluating untrusted input that would not otherwise be run as code.
 Story Points: ---
Clone Of: Environment:
Last Closed: 2014-10-22 05:29:51 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: 1146992, 1146993, 1148137, 1148138, 1148152, 1148153, 1148771    
Bug Blocks: 1141602    
Attachments:
Description Flags
Patch for CVE-2014-7186 and CVE-2014-7187 none

Description Wade Mealing 2014-09-26 05:23:29 UTC 
IssueDescription:

It was discovered that the fixed-sized redir_stack could be forced to overflow in the Bash parser, resulting in memory corruption, and possibly leading to arbitrary code execution when evaluating untrusted input that would not otherwise be run as code.
Comment 2 Garth Mollett 2014-09-26 07:09:26 UTC 
Acknowledgements:

This issue was discovered by Florian Weimer of Red Hat Product Security.
Comment 3 Tomas Hoger 2014-09-30 07:06:51 UTC 
Created attachment 942613 [details]
Patch for CVE-2014-7186 and CVE-2014-7187

Patch for CVE-2014-7186 and CVE-2014-7187 that was applied to bash 4.3 packages in Fedora.

Source:
http://pkgs.fedoraproject.org/cgit/bash.git/tree/bash-4.2-cve-2014-7169-2.patch

(Note that patch file name incorrectly mentions CVE-2014-7169.)

The first to hunks of the patch are fix for this issue, the last one is for the CVE-2014-7187 (bug 1146804).
Comment 4 Tomas Hoger 2014-09-30 07:10:38 UTC 
A patch for this issue was applied to the bash packages in Red Hat Enterprise Linux via RHSA-2014:1306, RHSA-2014:1311, and RHSA-2014:1312:

https://rhn.redhat.com/errata/RHSA-2014-1306.html
https://rhn.redhat.com/errata/RHSA-2014-1311.html
https://rhn.redhat.com/errata/RHSA-2014-1312.html

The errata do not mention the CVE in the description, as the CVE is was only assigned after those updates were released.
Comment 5 Gerrit Slomma 2014-09-30 08:23:20 UTC 
Is this patched via RHSA-2014:1293 in Red Hat Enterprise Linux 5?
Comment 6 Tomas Hoger 2014-09-30 08:35:32 UTC 
Comment 4 above already answers your question.
Comment 11 errata-xmlrpc 2014-10-02 18:44:01 UTC 
This issue has been addressed in the following products:

  RHEV Manager version 3.4

Via RHSA-2014:1354 https://rhn.redhat.com/errata/RHSA-2014-1354.html
Comment 12 Huzaifa S. Sidhpurwala 2014-10-22 05:29:51 UTC 
Statement:

A patch for this issue was applied to the bash packages in Red Hat Enterprise Linux via RHSA-2014:1306, RHSA-2014:1311, and RHSA-2014:1312. The errata do not mention the CVE in the description, as the CVE was only assigned after those updates were released.