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Sony SunnComm MediaMax DRM Software Insecure Directory Permissions
Secunia Advisory: SA17933
Release Date: 2005-12-07
Last Update: 2006-04-13
Popularity: 8,445 views

Critical:
Less critical
Impact: Manipulation of data
Privilege escalation
Where: Local system
Solution Status: Vendor Patch

Software:SunnComm MediaMax 5.x

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Description:
Jesse Burns and Alex Stamos has reported a security issue in SunnComm MediaMax, which can be exploited by malicious, local users to gain escalated privileges.

The security issue is caused due to insecure default directory ACLs being set on the "SunnComm Shared" directory, which allows "everyone" full access to the directory. This can be exploited by non-administrative users to modify the installed files, and potentially gain escalated privileges by e.g. replacing the MMX.exe program with a malicious program. The MMX.exe program will be automatically executed when another user inserts a MediaMax protected CD.

Changing the directory ACL manually is reportedly not effective as the insecure permissions will be restored the next time a MediaMax protected CD is played.

The security issue has been reported in version 5.0.21.0. Prior versions may also be affected.

Note: The MediaMax software reportedly will install itself even if the user declines the license agreement. The first patch is reportedly insecure as a malicious user can replace MediaMAX.dll with a malicious copy prior to the patch being applied. The replaced DLL will be loaded when user runs the patch.

Solution:
Apply the second patch (released on 2005-12-08).
http://www.sonybmg.com/indexmediamax.html

Refer to Sony's advisory for the list of CD titles that include the MediaMax software.

Provided and/or discovered by:
Jesse Burns and Alex Stamos, iSEC Partners.

Additional information by:
Alex Halderman

Changelog:
2005-12-19: Updated "Description" and "Solution" and credit sections.
2006-04-13: Added link to US-CERT vulnerability note.

Original Advisory:
Sony:
http://sonybmg.com/mediamax/
http://www.sonybmg.com/mediamax/titles.html

EFF:
http://www.eff.org/news/archives/2005_12.php#004234

iSEC Partners:
http://www.eff.org/IP/DRM/Sony-BMG/MediaMaxVulnerabilityReport.pdf

Alex Halderman:
http://www.freedom-to-tinker.com/?p=942

Other References:
US-CERT VU#928689:
http://www.kb.cert.org/vuls/id/928689


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