full-disclosure - [FD] Code Execution Vulnerabilities In 7zip

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Date: Sat, 14 May 2016 05:05:20 +0100
From: Nick Boyce <nick.boyce@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Code Execution Vulnerabilities In 7zip

Just karma whoring here, since I noticed the announcement and figured
the news needs to spread.  Cisco Talis discovered a number of bugs in
7zip versions prior to 16.00, some of which lead to arbitrary code
execution when processing certain malformed archives:

http://www.zdnet.com/article/severe-7-zip-vulnerabilities-cause-top-security-software-tools-patch-panic/#ftag=RSSbaffb68
http://blog.talosintel.com/2016/05/multiple-7-zip-vulnerabilities.html

Versions from 9.20 to 15.00 are said to contain some or all of the bugs.

The comment stream in the 2nd link contains this remark:

"By default 7zip will pass inputs through all of its decompression
routines so blocking certain extensions will not work unless you also
pass a command line argument that specifies the parser to use. These
bugs will trigger with a malformed UDF/HFS file with a .zip extension
unless the added command line argument is used."

Upgrading to 7zip V16.00 ("as soon as possible") is said to fix the
vulnerabilities.

The official 7zip changelog at http://www.7-zip.org/history.txt for
16.00 just says "Some bugs were fixed".

Nick
-- 
Cloud so convenient
Service provider not bright
All the files are gone

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