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Postfix Symlink Handling and Destination Ownership Security Issues

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Release Date:  2008-08-14    Last Update:  2008-08-19    Views:  10,533

Secunia Advisory SA31485

Where:

Local system

Impact:

Exposure of sensitive information, Privilege escalation

Solution Status:

Vendor Patch

Software:

CVE Reference(s):

Description


Sebastian Krahmer has reported some security issues in Postfix, which can be exploited by malicious, local users to disclose potentially sensitive information and perform certain actions with escalated privileges.

1) A security issue is caused due to Postfix incorrectly handling symlink files. This can be exploited to e.g. append mail messages to arbitrary files by creating a hardlink to a symlink owned by the root user.

Successful exploitation requires write permission to the mail spool directory, that there is no "root" mailbox, and users can create a hardlink to a symlink (e.g. Linux 2.x, Solaris, Irix 6.5).

2) A security issue is caused due to Postfix not correctly checking the ownership of the destination when delivering email. This can be exploited to e.g. disclose emails by creating an insecure mailbox file for other users.

Successful exploitation requires permission to create files within the mail spool directory.


Solution:
Update to version 2.5.4 Patchlevel 4.

Provided and/or discovered by:
Sebastian Krahmer, SuSE

Original Advisory:
SuSE:
http://lists.opensuse.org/opensuse-security-announce/2008-08/msg00002.html

Postfix:
http://de.postfix.org/ftpmirror/official/postfix-2.5.4.HISTORY
http://article.gmane.org/gmane.mail.postfix.announce/110

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: Postfix Symlink Handling and Destination Ownership Security Issues

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