Maildrop: privilege escalation

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 201009-02 / maildrop
Release Date	September 06, 2010
Latest Revision	September 06, 2010: 01
Impact	high
Exploitable	local

Package	Vulnerable versions	Unaffected versions	Architecture(s)
mail-filter/maildrop	< 2.4.2	>= 2.4.2	All supported architectures

Related bugreports: #308043

Synopsis

Insecure permission handling in maildrop might allow local attackers to elevate their privileges.

2. Impact Information

Background

maildrop is the mail filter/mail delivery agent that is used by the Courier Mail Server.

Description

Christoph Anton Mitterer reported that maildrop does not properly drop its privileges when run as root.

Impact

A local attacker could create a specially crafted .mailfilter file, possibly leading to the execution of arbitrary commands with the "root" group privileges. NOTE: Successful exploitation requires that maildrop is run as root with the -d option.

3. Resolution Information

Workaround

There is no known workaround at this time.

Resolution

All maildrop users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=mail-filter/maildrop-2.4.2"

4. References

CVE-2010-0301

Page updated September 06, 2010

Summary: This is a Gentoo Linux Security Advisory

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