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TITLE:
policycoreutils "seunshare" Temporary Directory Security Bypass
Weakness

SECUNIA ADVISORY ID:
SA43415

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/43415/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=43415

RELEASE DATE:
2011-03-07

DISCUSS ADVISORY:
http://secunia.com/advisories/43415/#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/43415/

ONLY AVAILABLE IN CUSTOMER AREA:
 * Authentication Level
 * Report Reliability
 * Secunia PoC
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 * Systems Affected
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 * Secunia CVSS Score
 * CVSS

https://ca.secunia.com/?page=viewadvisory&vuln_id=43415

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:
Tavis Ormandy has reported a weakness in policycoreutils, which can
be exploited by malicious, local users to bypass certain security
features.

The weakness is caused due to the "seunshare" utility allowing
unprivileged users to create fake temporary directories without the
sticky bit being set. This can be exploited to e.g. perform symlink
attacks on applications relying on the temporary directory being
protected by the sticky bit.

SOLUTION:
Restrict access to the "seunshare" utility to trusted users only.

PROVIDED AND/OR DISCOVERED BY:
Tavis Ormandy

ORIGINAL ADVISORY:
Tavis Ormandy:
http://archives.neohapsis.com/archives/fulldisclosure/2011-02/0585.html

Red Hat Bug #633544:
https://bugzilla.redhat.com/show_bug.cgi?id=633544

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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