Published: 12 September 2018
An issue was discovered in OpenAFS before 1.6.23 and 1.8.x before 1.8.2. The backup tape controller (butc) process accepts incoming RPCs but does not require (or allow for) authentication of those RPCs. Handling those RPCs results in operations being performed with administrator credentials, including dumping/restoring volume contents and manipulating the backup database. For example, an unauthenticated attacker can replace any volume's content with arbitrary data.
CVSS 3 base score: 9.8
Launchpad, Ubuntu, Debian
|Ubuntu 21.10 (Impish Indri)||
|Ubuntu 21.04 (Hirsute Hippo)||
|Ubuntu 20.04 LTS (Focal Fossa)||
|Ubuntu 18.04 LTS (Bionic Beaver)||
|Ubuntu 16.04 ESM (Xenial Xerus)||
(end of standard support, was needed)
|Ubuntu 14.04 ESM (Trusty Tahr)||
Does not exist
(trusty was needs-triage)
Per the upstream developers, "The in-tree backup suite is not believed to be in common use, so in that sense the impact is limited. Applying a strict firewall policy can also reduce the exposure of the butc to untrusted input and provide some level of remediation."