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TITLE:
Heimdal GSS-API and kdc NULL Pointer Dereferences Denial of Service

SECUNIA ADVISORY ID:
SA39953

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/39953/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=39953

RELEASE DATE:
2010-05-29

DISCUSS ADVISORY:
http://secunia.com/advisories/39953/#comments

AVAILABLE ON SITE AND IN CUSTOMER AREA:
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http://secunia.com/advisories/39953/

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https://ca.secunia.com/?page=viewadvisory&vuln_id=39953

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 * AUTOMATED SCANNING

http://secunia.com/vulnerability_scanning/personal/
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DESCRIPTION:
Some vulnerabilities have been reported in Heimdal, which can be
exploited by malicious users to cause a DoS (Denial of Service).

1) A vulnerability is caused due to a NULL pointer dereference error
when processing certain authenticators, which can be exploited to
cause a crash by sending an AP-REQ authenticator with a missing
checksum field.

This is related to:
SA39762

2) A vulnerability is caused due to a NULL pointer dereference error
within kdc when processing certain messages with missing values,
which can be exploited to cause a crash by sending specially crafted
messages.

SOLUTION:
Update to version 1.3.3.

PROVIDED AND/OR DISCOVERED BY:
The vendor credits Tom Yu of MIT Kerberos.

ORIGINAL ADVISORY:
http://www.h5l.org/advisories.html?show=2010-05-27

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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