policyd-weight uses temporary files in an insecure manner, allowing for a symlink attack.
| Package | Arch | Vulnerable | Unaffected |
|---|---|---|---|
| mail-filter/policyd-weight | * | < 0.1.14.17 | >= 0.1.14.17 |
policyd-weight is a Perl policy daemon for the Postfix MTA intended to eliminate forged envelope senders and HELOs.
Chris Howells reported that policyd-weight creates and uses the "/tmp/.policyd-weight/" directory in an insecure manner.
A local attacker could exploit this vulnerability to delete arbitrary files or change the ownership to the "polw" user via symlink attacks.
Set "$LOCKPATH = '/var/run/policyd-weight/'" manually in "/etc/policyd-weight.conf".
All policyd-weight users should upgrade to the latest version:
# 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.