Improper Verification of Cryptographic Signature Affecting borgbackup package, versions *


Severity

Recommended
low

Based on Debian security rating.

Threat Intelligence

EPSS
0.05% (17th percentile)

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  • Snyk IDSNYK-DEBIAN11-BORGBACKUP-5876488
  • published31 Aug 2023
  • disclosed30 Aug 2023

Introduced: 30 Aug 2023

CVE-2023-36811  (opens in a new tab)
CWE-347  (opens in a new tab)

How to fix?

There is no fixed version for Debian:11 borgbackup.

NVD Description

Note: Versions mentioned in the description apply only to the upstream borgbackup package and not the borgbackup package as distributed by Debian. See How to fix? for Debian:11 relevant fixed versions and status.

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 Base Scores

version 3.1