Source: btrbk X-Debbugs-CC: [email protected] Severity: grave Tags: security
Hi, The following vulnerability was published for btrbk. CVE-2026-62943[0]: | btrbk is a tool for creating snapshots and remote backups of Btrfs | subvolumes. From 0.29.0 until 0.32.7, btrbk's ssh_filter_btrbk.sh | constructs allow_stream_match with a start anchor but without an | end-of-string anchor for the complete command. A user restricted | through an authorized_keys forced command can append a trailing pipe | command after a valid btrbk command prefix, bypassing the allowlist | and executing arbitrary commands with the privileges of the backup- | target SSH account. Deployments that do not use ssh_filter_btrbk.sh | in authorized_keys are not affected. This issue is fixed in version | 0.32.7. https://github.com/digint/btrbk/security/advisories/GHSA-pf45-7g54-65h5 https://github.com/digint/btrbk/commit/29ca3c093205395bdeb9dd98677ab4139c458aec (v0.32.7) If you fix the vulnerability please also make sure to include the CVE (Common Vulnerabilities & Exposures) id in your changelog entry. For further information see: [0] https://security-tracker.debian.org/tracker/CVE-2026-62943 https://www.cve.org/CVERecord?id=CVE-2026-62943 Please adjust the affected versions in the BTS as needed.
