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TITLE:
GNOME Display Manager "PostLogin" Script Weakness

SECUNIA ADVISORY ID:
SA43437

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/43437/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=43437

RELEASE DATE:
2011-03-08

DISCUSS ADVISORY:
http://secunia.com/advisories/43437/#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/43437/

ONLY AVAILABLE IN CUSTOMER AREA:
 * Authentication Level
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https://ca.secunia.com/?page=viewadvisory&vuln_id=43437

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 weakness has been reported in GNOME Display Manager, which can lead
to unexpected behavior with potentially security relevant
implications.

The weakness is caused due to the GNOME Display Manager invoking the
"PostLogin" script with an incorrect username, which results in e.g.
the $USER, $USERNAME, and $LOGNAME variables being assigned a wrong
value (e.g. "gdm" instead of the username of the user who just logged
in).

Note: This only affects deployments where the "PostLogin" script
relies on the correctness of e.g. the $USER, $USERNAME, and $LOGNAME
variables (the default "PostLogin" script does not contain any
functionality).

SOLUTION:
Update to version 2.30.0.

PROVIDED AND/OR DISCOVERED BY:
Reported by ericlesoll in a GNOME bug.

ORIGINAL ADVISORY:
GNOME Bug #602403:
https://bugzilla.gnome.org/show_bug.cgi?id=602403

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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private users keeping their systems up to date against the latest
vulnerabilities.

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