Technical Description

Multiple vulnerabilities were identified in MIT Kerberos, which could be exploited by remote attackers to execute arbitrary commands or cause a denial of service.

The first issue occurs in the MIT krb5 Key Distribution Center (KDC) implementation when processing specially crafted TCP/UDP requests, which could be exploited by an unauthenticated attacker to cause a denial of service or execute arbitrary code on the KDC host.

The second vulnerability is due to a double-free error in the "krb5_recvauth()" function, which could be exploited by an unauthenticated remote attacker to execute arbitrary code in the context of a program calling the vulnerable function (this includes the kpropd program which typically runs on slave Key Distribution Center hosts).

Affected Products

MIT Kerberos 5 version 1.4.1 (krb5-1.4.1) and prior

Solution

Upgrade to krb5-1.4.2 release :
http://web.mit.edu/kerberos/dist/index.html
Or apply patches :
http://web.mit.edu/kerberos/advisories/2005-002-patch_1.4.1.txt
http://web.mit.edu/kerberos/advisories/2005-003-patch_1.4.1.txt

References

http://www.vupen.com/english/advisories/2005/1066
http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2005-002-kdc.txt
http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2005-003-recvauth.txt

Credits

Vulnerabilities reported by Daniel Wachdorf and Magnus Hagander

ChangeLog

2005-07-12 : Initial release

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