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Mac OS X File Association Meta Data Shell Script Execution
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Secunia Advisory:
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SA18963
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Release Date:
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2006-02-21
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Last Update:
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2006-03-14
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Critical:
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Extremely critical
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Impact:
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System access
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Where:
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From remote
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Solution Status:
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Partial Fix
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| OS: | Apple Macintosh OS X
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| | CVE reference: | CVE-2006-0848 (Secunia mirror)
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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 in ZIP archives (stored in the "__MACOSX" folder) and mail messages (defined via the AppleDouble MIME format). This can be exploited to trick users into executing a malicious shell script renamed to a safe file extension stored in a ZIP archive or in a mail attachment.
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), Mail 2.0.5 (746/746.2), and Mac OS X 10.4.5.
Solution:
Apply Security Update 2006-002.
NOTE: The update does not completely fix the vulnerability as it is still possible to trick users into opening malicious shell scripts (masqueraded as a safe file type) in ZIP archives. Do not open files in untrusted archives.
Provided and/or discovered by:
Michael Lehn
Changelog:
2006-02-22: Added link to US-CERT vulnerability note, and updated "Description" and "Solution" sections.
2006-02-27: Added CVE reference.
2006-03-02: Updated "Solution" section.
2006-03-03: Updated "Solution" section.
2006-03-14: Vendor issues Security Update 2006-002. Updated "Solution" section.
Other References:
US-CERT VU#999708:
http://www.kb.cert.org/vuls/id/999708
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.
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