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Maildrop: privilege escalation


1.  Gentoo Linux Security Advisory

Version Information

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


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

2.  Impact Information


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


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


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


There is no known workaround at this time.


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


Page updated September 06, 2010

Summary: This is a Gentoo Linux Security Advisory

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