Ingo H3: Folder name shell command injection

Background

Ingo H3 is a generic frontend for editing Sieve, procmail, maildrop and IMAP filter rules.

Description

Ingo H3 fails to properly escape shell metacharacters in procmail rules.

Impact

A remote authenticated attacker could craft a malicious rule which could lead to the execution of arbitrary shell commands on the server.

Workaround

Don’t use procmail with Ingo H3.

Resolution

All Ingo H3 users should upgrade to the latest version:

 # emerge --sync
 # emerge --ask --oneshot --verbose ">=www-apps/horde-ingo-1.1.2"