getmail: Filesystem overwrite vulnerability — GLSA 200409-32

getmail contains a vulnerability that could potentially allow any local user to create or overwrite files in any directory on the system. This flaw can be escalated further and possibly lead to a complete system compromise.

Affected Packages

net-mail/getmail on all architectures
Affected versions < 4.2.0
Unaffected versions >= 4.2.0

Background

getmail is a reliable fetchmail replacement that supports Maildir, Mboxrd and external MDA delivery.

Description

David Watson discovered a vulnerability in getmail when it is configured to run as root and deliver mail to the maildirs/mbox files of untrusted local users. A malicious local user can then exploit a race condition, or a similar symlink attack, and potentially cause getmail to create or overwrite files in any directory on the system.

Impact

An untrusted local user could potentially create or overwrite files in any directory on the system. This vulnerability may also be exploited to have arbitrary commands executed as root.

Workaround

Do not run getmail as a privileged user; or, in version 4, use an external MDA with explicitly configured user and group privileges.

Resolution

All getmail users should upgrade to the latest version:

 # emerge sync
 
 # emerge -pv ">=net-mail/getmail-4.2.0"
 # emerge ">=net-mail/getmail-4.2.0"

References

Release Date
September 23, 2004

Latest Revision
May 22, 2006: 02

Severity
high

Exploitable
local

Bugzilla entries