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Re: CVE Request: grep
From: Kurt Seifried <kseifried () redhat com>
Date: Fri, 21 Dec 2012 23:54:10 -0700

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On 12/21/2012 05:19 PM, Seth Arnold wrote:
Hello Kurt, Steve, all.

Paul, I've included you on Cc: to help determine if several grep
patches are security-relevant.

A bug reporter [1] that claims he has, or can produce, a code
execution exploit against grep < 2.11. I've verified that our grep
2.10 package segfaults on the amd64 platform with the simple
reproducer:

$ perl -e 'print "x"x(2**31)' | grep x > /dev/null Segmentation
fault (core dumped)

Confirmed it segfaults. Would it be possible to get a reproducer for
this issue?

Please use CVE-2012-5667 for this issue.

This specific problem was patched [2] with the following checkin: 
http://git.savannah.gnu.org/cgit/grep.git/commit/?id=cbbc1a45b9f843c811905c97c90a5d31f8e6c189

 This checkin adds this text to the NEWS file:

+ grep no longer dumps core on lines whose lengths do not fit in
'int'. + (e.g., lines longer than 2 GiB on a typical 64-bit host). 
+ Instead, grep either works as expected, or reports an error. + An
error can occur if not enough main memory is available, or if the +
GNU C library's regular expression functions cannot handle such
long lines. + [bug present since "the beginning"]

Please assign a CVE number for this problem.


Several other checkins around the 2.11 timeframe also look like
they may be security-relevant:

PCRE over-long line fix: 
http://git.savannah.gnu.org/cgit/grep.git/commit/?id=4572ea4649d025e51463d48c2d06a1c66134cdb8

 Integer overflow issues: 
http://git.savannah.gnu.org/cgit/grep.git/commit/?id=8fcf61523644df42e1905c81bed26838e0b04f91

 Paul, are any security issues fixed with those patches? Did I
overlook any other patches that need CVE numbers?

Thanks


1: https://bugs.launchpad.net/ubuntu/+source/grep/+bug/1091473 2:
http://lists.gnu.org/archive/html/bug-grep/2012-12/msg00004.html



- -- 
Kurt Seifried Red Hat Security Response Team (SRT)
PGP: 0x5E267993 A90B F995 7350 148F 66BF 7554 160D 4553 5E26 7993

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