Security Advisory SA32119 - pam_krb5 Credential Cache "exisiting_ticket" Security Bypass

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Secunia Advisory SA32119

pam_krb5 Credential Cache "exisiting_ticket" Security Bypass

Secunia Advisory

SA32119

Release Date

2008-10-03

Popularity

5,622 views

Comments

0 comments

Criticality level

Less critical

Impact

Security Bypass

Where

Local system

Authentication level

This information is available to Secunia VIM customers

Report reliability

This information is available to Secunia VIM customers

Solution Status

Vendor Patch

Systems affected

This information is available to Secunia VIM customers

Approve distribution

This information is available to Secunia VIM customers

Software:

pam_krb5 2.x

Secunia CVSS Score

This information is available to Secunia VIM Customers

CVE Reference(s)

CVE-2008-3825 CVSS score available to Secunia VIM customers

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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Secunia Advisory SA32119

pam_krb5 Credential Cache "exisiting_ticket" Security Bypass

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