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Insecure Library Loading
Moderately critical

Kerberos V5 "krb5_aname_to_localname()" Buffer Overflow Vulnerabilities

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Release Date:  2004-06-02    Last Update:  2004-06-05    Views:  17,070

Secunia Advisory SA11753

Where:

From remote

Impact:

System access

Solution Status:

Vendor Patch

Software:

CVE Reference(s):

Description


Vulnerabilities have been discovered in Kerberos V5, which can be exploited by malicious users to compromise a vulnerable system.

The vulnerabilities are caused due to boundary errors within the "krb5_aname_to_localname()" library function during conversion of Kerberos principal names into local account names. These can be exploited to cause heap-based buffer overflows by passing an overly long principal name when authenticating.

Exploitation may allow execution of arbitrary code on a vulnerable system with root privileges. However, this requires successful authentication to a vulnerable service, and the explicit mapping or rules-based mapping functionality has been enabled (not default configuration).

The vulnerabilities affect version 1.3.3 and prior.


Solution:
Disable the affected functionality or apply patch:

Further details available to Secunia VIM customers

Provided and/or discovered by:
Christopher Nebergall
Nico Williams

Original Advisory:
http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2004-001-an_to_ln.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 "krb5_aname_to_localname()" Buffer Overflow Vulnerabilities

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