Bug 889935 (CVE-2012-5667)

Summary: CVE-2012-5667 grep: Integer overflow leading to heap-based buffer-overflow when reading large lines
Product: [Other] Security Response Reporter: Huzaifa S. Sidhpurwala <huzaifas>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED ERRATA QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: jlieskov, jrusnack, jskarvad, lkundrak
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Fixed In Version: grep 2.11 Doc Type: Bug Fix
Doc Text:
An integer overflow flaw, leading to a heap-based buffer overflow, was found in the way grep parsed large lines of data. An attacker able to trick a user into running grep on a specially crafted data file could use this flaw to crash grep or, potentially, execute arbitrary code with the privileges of the user running grep.
Story Points: ---
Clone Of: Environment:
Last Closed: 2015-07-22 18:12:00 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Bug Depends On: 1198218    
Bug Blocks: 889936, 1183652, 1193283    
Description Flags
Proposed fix
Proposed fix (to cover boundary case) none

Description Huzaifa S. Sidhpurwala 2012-12-24 04:57:00 UTC
An integer overflow leading to a heap-based buffer overflow was found in the way grep, A utility used to search through textual input for lines which contain a match to a specified pattern, parsed large lines of data. This flaw could use used to crash grep or potentially execute arbitrary code, if a local user was tricked into running grep on a specially crafted data file.

Patch: http://git.savannah.gnu.org/cgit/grep.git/commit/?id=cbbc1a45b9f843c811905c97c90a5d31f8e6c189
Reference: http://seclists.org/oss-sec/2012/q4/504

Comment 1 Huzaifa S. Sidhpurwala 2012-12-24 06:53:11 UTC
Upstream suggests that this issue only affects grep < 2.11

Comment 2 Huzaifa S. Sidhpurwala 2012-12-26 05:29:40 UTC
This issue affects the version of grep package as shipped with Fedora-16. 

This issue does NOT affect the version of grep package as shipped with Fedora-17.

Comment 5 Jaroslav Škarvada 2013-01-04 16:25:20 UTC
I am unable to reproduce the crash on F16.

64 bit machine with 4 GB RAM:
# perl -e 'print "x"x(2**31)' | grep x > /dev/null
grep: memory exhausted

# grep --version
grep (GNU grep) 2.9

Comment 7 Huzaifa S. Sidhpurwala 2013-01-21 09:44:58 UTC

This issue did not affect the version of grep as shipped with Red Hat Enterprise Linux 5.

Comment 10 Jaroslav Škarvada 2013-01-24 09:18:55 UTC
Created attachment 686585 [details]
Proposed fix

This is proposed fix/workaround for the problem. It is not clean solution, but it shouldn't have side-effects.

Comment 12 Jaroslav Škarvada 2013-01-24 09:44:09 UTC
Created attachment 686605 [details]
Proposed fix (to cover boundary case)

# perl -e 'print "x"x(1073741823)' | LANG=c grep x > /dev/null

# perl -e 'print "x"x(1073741824)' | LANG=c grep x > /dev/null
grep: line too long

Comment 15 errata-xmlrpc 2015-07-22 06:17:52 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6

Via RHSA-2015:1447 https://rhn.redhat.com/errata/RHSA-2015-1447.html