CVE-2011-0017 Path traversal in n/a

Medium 6.9 Published 2 Feb 2011 Updated 6 Aug 2024

Local attackers can append data to arbitrary files via symlink attacks due to unchecked setuid/setgid return values in Exim.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Local or same network only
Victim action needed: Not needed
Fix: Available

What is CVE-2011-0017?

CVE-2011-0017 is a medium-severity path traversal vulnerability in Exim Exim, published on 2 Feb 2011. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

The open_log function in log.c in Exim 4.72 and earlier does not check the return value from (1) setuid or (2) setgid system calls, which allows local users to append log data to arbitrary files via a symlink attack.

Weakness: CWE-59, CWE-20

Which versions are affected by CVE-2011-0017?

It affects 1 product.

Products include Exim Exim.

How do I fix CVE-2011-0017?

Upgrade to a fixed version.

Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.

Is CVE-2011-0017 being exploited?

There is no known exploitation of CVE-2011-0017 in the wild and no public exploit code.

All Exim Exim vulnerabilities

Sources

Also known as DEBIAN-CVE-2011-0017, GHSA-6w36-rjfw-vf62.