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TITLE:
SSSD Automatic Ticket Renewal Credentials Cache File Security Issue

SECUNIA ADVISORY ID:
SA44387

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/44387/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=44387

RELEASE DATE:
2011-05-02

DISCUSS ADVISORY:
http://secunia.com/advisories/44387/#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/44387/

ONLY AVAILABLE IN CUSTOMER AREA:
 * Authentication Level
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https://ca.secunia.com/?page=viewadvisory&vuln_id=44387

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 security issue has been reported in SSSD, which can be exploited by
malicious people to hijack another user's account.

The security issue is caused due to the automatic ticket renewal
service setting the credential cache path as the user's cached
credentials, which can be exploited to log in as another user by
determining or predicting the name of the other user's cache file.

Successful exploitation requires that the automatic ticket renewal
option and offline authentication are enabled, the SSSD daemon is
authenticating in offline mode, and a renewal operation for the
victim user has been performed without any further authentication
from the victim user taking place.

Note: Remote attackers may only be able to predict the filename if
the "mkstemp()" suffix has been removed from the
"krb5_ccache_template" SSSD configuration option.

The vulnerability is reported in versions 1.5.0 to 1.5.7.

SOLUTION:
Update to version 1.5.7.

PROVIDED AND/OR DISCOVERED BY:
The vendor credits Marko Myllynen, Red Hat.

ORIGINAL ADVISORY:
https://fedorahosted.org/sssd/wiki/Releases/Notes-1.5.7
https://fedorahosted.org/sssd/ticket/856
http://git.fedorahosted.org/git/?p=sssd.git;a=commitdiff;h=fffdae81651b460f3d2c119c56d5caa09b4de42a

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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