Vulnerability Description
borgbackup is an opensource, deduplicating archiver with compression and authenticated encryption. A flaw in the cryptographic authentication scheme in borgbackup allowed an attacker to fake archives and potentially indirectly cause backup data loss in the repository. The attack requires an attacker to be able to: 1. insert files (with no additional headers) into backups and 2. gain write access to the repository. This vulnerability does not disclose plaintext to the attacker, nor does it affect the authenticity of existing archives. Creating plausible fake archives may be feasible for empty or small archives, but is unlikely for large archives. The issue has been fixed in borgbackup 1.2.5. Users are advised to upgrade. Additionally to installing the fixed code, users must follow the upgrade procedure as documented in the change log. Data loss after being attacked can be avoided by reviewing the archives (timestamp and contents valid and as expected) after any "borg check --repair" and before "borg prune". There are no known workarounds for this vulnerability.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Borgbackup | Borg | < 1.2.5 |
Related Weaknesses (CWE)
References
- https://github.com/borgbackup/borg/blob/1.2.5-cvedocs/docs/changes.rst#pre-125-aThird Party Advisory
- https://github.com/borgbackup/borg/commit/3eb070191da10c2d3f7bc6484cf3d51c3045f8Patch
- https://github.com/borgbackup/borg/security/advisories/GHSA-8fjr-hghr-4m99Vendor Advisory
- https://lists.fedoraproject.org/archives/list/[email protected]
- https://lists.fedoraproject.org/archives/list/[email protected]
- https://lists.fedoraproject.org/archives/list/[email protected]
- https://github.com/borgbackup/borg/blob/1.2.5-cvedocs/docs/changes.rst#pre-125-aThird Party Advisory
- https://github.com/borgbackup/borg/commit/3eb070191da10c2d3f7bc6484cf3d51c3045f8Patch
- https://github.com/borgbackup/borg/security/advisories/GHSA-8fjr-hghr-4m99Vendor Advisory
- https://lists.fedoraproject.org/archives/list/[email protected]
- https://lists.fedoraproject.org/archives/list/[email protected]
- https://lists.fedoraproject.org/archives/list/[email protected]
FAQ
What is CVE-2023-36811?
CVE-2023-36811 is a vulnerability with a CVSS score of 4.7 (MEDIUM). borgbackup is an opensource, deduplicating archiver with compression and authenticated encryption. A flaw in the cryptographic authentication scheme in borgbackup allowed an attacker to fake archives ...
How severe is CVE-2023-36811?
CVE-2023-36811 has been rated MEDIUM with a CVSS base score of 4.7/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2023-36811?
Check the references section above for vendor advisories and patch information. Affected products include: Borgbackup Borg.