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policyd-weight: Insecure temporary file creation

Content:

1.  Gentoo Linux Security Advisory

Version Information

Advisory Reference GLSA 200804-11 / policyd-weight
Release Date April 11, 2008
Latest Revision April 11, 2008: 01
Impact normal
Exploitable local
Package Vulnerable versions Unaffected versions Architecture(s)
mail-filter/policyd-weight < 0.1.14.17 >= 0.1.14.17 All supported architectures

Related bugreports: #214403

Synopsis

policyd-weight uses temporary files in an insecure manner, allowing for a symlink attack.

2.  Impact Information

Background

policyd-weight is a Perl policy daemon for the Postfix MTA intended to eliminate forged envelope senders and HELOs.

Description

Chris Howells reported that policyd-weight creates and uses the "/tmp/.policyd-weight/" directory in an insecure manner.

Impact

A local attacker could exploit this vulnerability to delete arbitrary files or change the ownership to the "polw" user via symlink attacks.

3.  Resolution Information

Workaround

Set "$LOCKPATH = '/var/run/policyd-weight/'" manually in "/etc/policyd-weight.conf".

Resolution

All policyd-weight users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=mail-filter/policyd-weight-0.1.14.17"

This version changes the default path for sockets to "/var/run/policyd-weight", which is only writable by a privileged user. Users need to restart policyd-weight immediately after the upgrade due to this change.

4.  References



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Page updated April 11, 2008

Summary: This is a Gentoo Linux Security Advisory

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