oss-security - more bash parser bugs (CVE-2014-6277, CVE-2014-6278)

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Message-ID: <20141001202017.666b7d73@hboeck.de>
Date: Wed, 1 Oct 2014 20:20:17 +0200
From: Hanno Böck <hanno@...eck.de>
To: oss-security@...ts.openwall.com
Cc: Chet Ramey <chet.ramey@...e.edu>
Subject: more bash parser bugs (CVE-2014-6277, CVE-2014-6278)

Haven't seen it here yet. lcamtuf now disclosed details of the two
further parser bugs he found:
http://lcamtuf.blogspot.de/2014/10/bash-bug-how-we-finally-cracked.html

Basically if anyone hasn't applied one of the prefix patches yet now's
the time to do so.

While prefixing should shield against them they should still be fixed
for good.

CVE-2014-6277 can still be triggered to segfault a fully patched bash:
bash -c "f(){ x(){ _;}; x(){ _;}<<a;}"

Second issue PoC on fully patched system:
env BASH_FUNC_x%%='() { _;}>_[$($())] { echo vuln;}' bash -c :

(both likely not exploitable due to prefix shielding, but should be
fixed anyway)

-- 
Hanno Böck
http://hboeck.de/

mail/jabber: hanno@...eck.de
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