oss-sec mailing list archives
Re: more bash parser bugs (CVE-2014-6277, CVE-2014-6278)
From: Chet Ramey <chet.ramey () case edu>
Date: Wed, 01 Oct 2014 14:27:54 -0400
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 10/1/14, 2:20 PM, Hanno Böck wrote:
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)
I have patches for these, and they are in the pipeline. Chet - -- ``The lyf so short, the craft so long to lerne.'' - Chaucer ``Ars longa, vita brevis'' - Hippocrates Chet Ramey, ITS, CWRU chet () case edu http://cnswww.cns.cwru.edu/~chet/ -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (Darwin) iEYEARECAAYFAlQsR6oACgkQu1hp8GTqdKtxOQCdGtpKc/kiYnypk44IlIp3y1C2 3MAAnRiNiAdo8SAHubCwKlrHGU4hnHXa =wGXW -----END PGP SIGNATURE-----
Current thread:
- more bash parser bugs (CVE-2014-6277, CVE-2014-6278) Hanno Böck (Oct 01)
- Re: more bash parser bugs (CVE-2014-6277, CVE-2014-6278) Chet Ramey (Oct 01)
- Re: more bash parser bugs (CVE-2014-6277, CVE-2014-6278) Shawn (Oct 01)
- Re: more bash parser bugs (CVE-2014-6277, CVE-2014-6278) Chet Ramey (Oct 01)
- Re: more bash parser bugs (CVE-2014-6277, CVE-2014-6278) Shawn (Oct 01)
- Re: more bash parser bugs (CVE-2014-6277, CVE-2014-6278) Ed Prevost (Oct 01)
- Re: more bash parser bugs (CVE-2014-6277, CVE-2014-6278) Zach Wikholm (Oct 01)
- RE: more bash parser bugs (CVE-2014-6277, CVE-2014-6278) Henry, Bobby (Oct 01)
- Re: more bash parser bugs (CVE-2014-6277, CVE-2014-6278) Chet Ramey (Oct 01)
- Re: more bash parser bugs (CVE-2014-6277, CVE-2014-6278) Ed Prevost (Oct 01)
- Re: more bash parser bugs (CVE-2014-6277, CVE-2014-6278) Shawn (Oct 01)
- Re: more bash parser bugs (CVE-2014-6277, CVE-2014-6278) Michal Zalewski (Oct 01)
- Re: more bash parser bugs (CVE-2014-6277, CVE-2014-6278) Chet Ramey (Oct 01)