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Highly critical

Kerberos V5 Multiple Vulnerabilities

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Release Date:  2005-07-13    Last Update:  2005-07-14    Views:  22,190

Secunia Advisory SA16041

Where:

From remote

Impact:

DoS, System access

Solution Status:

Vendor Patch

Software:

CVE Reference(s):

Description


Some vulnerabilities have been reported in Kerberos, which can be exploited by malicious people to cause a DoS (Denial of Service) or potentially compromise a vulnerable system.

1) A double-free error in the "krb5_recvauth()" function can potentially be exploited to execute arbitrary code in the context of the program calling this function.

Successful exploitation may lead to the compromise of an entire Kerberos realm or cause the program to crash.

The vulnerability has been reported in kpropd, klogind, and krshd versions 1.4.1 and prior. Any third-party programs calling the "krb5_recvauth()" function are also vulnerable.

2) An error in the Key Distribution Center (KDC) implementation causes the freeing of memory at random locations, which leads to heap corruption via a specially crafted TCP request.

Successful exploitation crashes the KDC.

The vulnerability has been reported in KDC implementations versions 1.4.1 and prior.

3) A boundary error in the KDC can cause a single-byte heap-based buffer overflow via a specially crafted TCP or UDP request. This can potentially be exploited to execute arbitrary code.

Successful exploitation may lead to the compromise of an entire Kerberos realm or cause a DoS.

The vulnerability has been reported in KDC implementations and application servers versions 1.4.1 and prior. Third-party application servers using MIT krb5 are also affected.


Solution:
Apply patches:

Further details available to Secunia VIM customers

Provided and/or discovered by:
1) The vendor credits Magnus Hagander.
2, 3) The vendor credits Daniel Wachdorf.

Original Advisory:
http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2005-003-recvauth.txt
http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2005-002-kdc.txt

Deep Links:
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: Kerberos V5 Multiple Vulnerabilities

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