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Insecure Library Loading
Highly critical

Kerberos Multiple Vulnerabilities

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Release Date:  2007-06-27    Views:  14,551

Secunia Advisory SA25800

Where:

From remote

Impact:

DoS, System access

Solution Status:

Vendor Workaround

Software:

CVE Reference(s):

Description


Some vulnerabilities have been reported in Kerberos, which can be exploited by malicious users and malicious people to compromise a vulnerable system.

1) An error exists within the "gssrpc__svcauth_gssapi" function in the RPC library, which can cause kadmind and possibly other third-party products to free an uninitialised pointer when receiving an RPC credential with a length of zero.

2) A signedness error exists within the "gssrpc__svcauth_unix()" function in the RPC library, which is used by kadmind and possibly other third-party products. This can be exploited to cause a stack-based buffer overflow.

Successful exploitation of vulnerability #1 and #2 potentially allows execution of arbitrary code.

3) A boundary error exists in kadmind within the "rename_principal_2_svc()" function and can be exploited to cause a stack-based buffer overflow.

Successful exploitation allows execution of arbitrary code but requires valid user credentials.

The vulnerabilities are reported in krb5-1.6.1. Other versions may also be affected.


Solution:
Apply patches (see vendor advisories for details).

Further details available to Secunia VIM customers

Provided and/or discovered by:
1, 2) The vendor credits Wei Wang, McAfee Avert Labs.
3) An anonymous person, reported via iDefense Labs.

Original Advisory:
Kerberos:
http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2007-004.txt
http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2007-005.txt

iDefense Labs:
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=548

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 Multiple Vulnerabilities

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