February 2006

ID: 00150
Ref: 148/06
Date: 21 February 2006:16:13:39
Version: 1

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Title: Secunia - Mac OS X __MACOSX ZIP Archive Shell Script Execution
Abstract:
Vendors affected: Apple
Operating systems affected: Apple
Applications affected: Apple

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TITLE:
Mac OS X "__MACOSX" ZIP Archive Shell Script Execution

SECUNIA ADVISORY ID:
SA18963

VERIFY ADVISORY:
http://secunia.com/advisories/18963/

CRITICAL:
Extremely critical

IMPACT:
System access

WHERE:
- From remote

OPERATING SYSTEM:
Apple Macintosh OS X
http://secunia.com/product/96/

DESCRIPTION:
Michael Lehn has discovered a vulnerability in Mac OS X, which can be
exploited by malicious people to compromise a user's system.

The vulnerability is caused due to an error in the processing of file
association meta data (stored in the "__MACOSX" folder) in ZIP
archives. This can be exploited to trick users into executing a
malicious shell script renamed to a safe file extension stored in a
ZIP archive.

This can also be exploited automatically via the Safari browser when
visiting a malicious web site.

Secunia has constructed a test, which can be used to check if your
system is affected by this issue:
http://secunia.com/mac_os_x_command_execution_vulnerability_test/

The vulnerability has been confirmed on a fully patched system with
Safari 2.0.3 (417.8) and Mac OS X 10.4.5.

SOLUTION:
The vulnerability can be mitigated by disabling the "Open safe files
after downloading" option in Safari.

Do not open files in ZIP archives originating from untrusted sources.

PROVIDED AND/OR DISCOVERED BY:
Michael Lehn

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About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

Subscribe:
http://secunia.com/secunia_security_advisories/

Definitions: (Criticality, Where etc.)
http://secunia.com/about_secunia_advisories/


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Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.