TITLE:
Sony SunnComm MediaMax DRM Software Insecure Directory Permissions

SECUNIA ADVISORY ID:
SA17933

VERIFY ADVISORY:
http://secunia.com/advisories/17933/

CRITICAL:
Less critical

IMPACT:
Manipulation of data, Privilege escalation

WHERE:
Local system

SOFTWARE:
SunnComm MediaMax 5.x
http://secunia.com/product/6385/

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.

SOLUTION:
Update to the fixed version.
http://sonybmg.com/mediamax/

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.

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

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