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TITLE:
Kerberos KDC "prepare_error_as" Double-Free Vulnerability

SECUNIA ADVISORY ID:
SA43783

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/43783/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=43783

RELEASE DATE:
2011-03-17

DISCUSS ADVISORY:
http://secunia.com/advisories/43783/#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/43783/

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=43783

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 reported in Kerberos, which can be exploited
by malicious people to potentially compromise a vulnerable system.

The vulnerability is caused due to an error in KDC within the
"prepare_error_as()" function in src/kdc/do_as_req.c when handling
AS-REQ request and can be exploited to trigger a double-free
condition by sending specially crafted AS-REQ requests.

Successful exploitation may allow execution of arbitrary code, but
requires that the Public Key Cryptography for Initial Authentication
(PKINIT) capability is enabled.

The vulnerability is reported in KDC in releases krb5-1.7 and later.

SOLUTION:
Apply patch.

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

PROVIDED AND/OR DISCOVERED BY:
Cameron Meadors, Red Hat

ORIGINAL ADVISORY:
http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2011-003.txt

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:
This Advisory was delivered by Secunia as a free service to help
private users keeping their systems up to date against the latest
vulnerabilities.

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Definitions: (Criticality, Where etc.)
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Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

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