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pam_krb5 Credential Cache "exisiting_ticket" Security Bypass

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Release Date:  2008-10-03    Views:  6,110

Secunia Advisory SA32119

Where:

Local system

Impact:

Security Bypass

Solution Status:

Vendor Patch

Software:

CVE Reference(s):

Description


A security issue has been reported in pam_krb5, which can be exploited by malicious, local users to bypass certain security restrictions.

The security issue is caused due to pam_krb5 not correctly restricting users from reusing the existing credentials of another user. This can be exploited to e.g. switch into another user's account by setting the "KRB5CCNAME" variable to point to the credentials cache of the target user.

Successful exploitation requires that the "existing_ticket" option is enabled.

The security issue is reported in versions 2.2.0 to 2.2.25, 2.3.0, and 2.3.1. Other versions may also be affected.


Solution:
Update to version 2.3.2-1.

Provided and/or discovered by:
Stéphane Bertin

Original Advisory:
RHSA-2008-0907:
https://rhn.redhat.com/errata/RHSA-2008-0907.html

Red Hat Bug #461960:
https://bugzilla.redhat.com/show_bug.cgi?id=461960

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: pam_krb5 Credential Cache "exisiting_ticket" Security Bypass

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