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TITLE:
Microsoft Windows Environment Variable Expansion Library Loading
Vulnerability

SECUNIA ADVISORY ID:
SA41984

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/41984/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=41984

RELEASE DATE:
2010-10-29

DISCUSS ADVISORY:
http://secunia.com/advisories/41984/#comments

AVAILABLE ON SITE AND IN CUSTOMER AREA:
 * Last Update
 * Popularity
 * Comments
 * Criticality Level
 * Impact
 * Where
 * Solution Status
 * Operating System / Software
 * CVE Reference(s)

http://secunia.com/advisories/41984/

ONLY AVAILABLE IN CUSTOMER AREA:
 * Authentication Level
 * Report Reliability
 * Secunia PoC
 * Secunia Analysis
 * Systems Affected
 * Approve Distribution
 * Remediation Status
 * Secunia CVSS Score
 * CVSS

https://ca.secunia.com/?page=viewadvisory&vuln_id=41984

ONLY AVAILABLE WITH SECUNIA CSI AND SECUNIA PSI:
 * AUTOMATED SCANNING

http://secunia.com/vulnerability_scanning/personal/
http://secunia.com/vulnerability_scanning/corporate/wsus_sccm_3rd_third_party_patching/

DESCRIPTION:
A vulnerability has been discovered in Microsoft Windows, which can
be exploited by malicious people to potentially compromise a user's
system.

The vulnerability is caused due to Windows not properly expanding
certain values in environment variables (e.g. "%APPDATA%" in the
"PATH" environment variable), leading to the unexpanded value being
used as relative search path when loading resources. This can be
exploited to load arbitrary resources by tricking a user into opening
a file located on a remote WebDAV or SMB share with certain
applications.

Successful exploitation allows execution of arbitrary code.
Currently, known applications presenting valid attack vectors are
e.g. Apple iTunes and Safari.

The vulnerability is confirmed in a fully patched Windows XP
Professional SP3 and is also reported in Windows Vista Business, and
Windows 7 Professional. Other versions may also be affected.

SOLUTION:
Do not open untrusted files.

PROVIDED AND/OR DISCOVERED BY:
Known, documented bug in Windows.

Security impact reported by ACROS Security.

ORIGINAL ADVISORY:
Windows KB32908:
http://support.microsoft.com/kb/329308

ACROS Security:
http://blog.acrossecurity.com/2010/10/breaking-setdlldirectory-protection.html

OTHER REFERENCES:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

DEEP LINKS:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXTENDED DESCRIPTION:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXTENDED SOLUTION:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXPLOIT:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

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About:
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vulnerabilities.

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