btrbk: Remote Code Execution

Background

btrbk is a backup tool for btrfs subvolumes, taking advantage of btrfs specific capabilities to create atomic snapshots and transfer them incrementally to your backup locations.

Description

A vulnerability has been discovered in btrbk. Please review the CVE identifier referenced below for details.

Impact

Specialy crafted commands may be executed without being propely checked. Applies to remote hosts filtering ssh commands using ssh_filter_btrbk.sh in authorized_keys.

Workaround

There is no known workaround at this time.

Resolution

All btrbk users should upgrade to the latest version:

 # emerge --sync
 # emerge --ask --oneshot --verbose ">=app-backup/btrbk-0.31.2"