borgbackup up to 1.2.4 signature verification

Summaryinfo

A vulnerability was found in borgbackup up to 1.2.4 and classified as problematic. The affected element is an unknown function. Executing a manipulation can lead to signature verification. The identification of this vulnerability is CVE-2023-36811. The attack can only be executed locally. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in borgbackup up to 1.2.4 (Backup Software). It has been declared as problematic. This vulnerability affects an unknown code. The manipulation with an unknown input leads to a signature verification vulnerability. The CWE definition for the vulnerability is CWE-347. The product does not verify, or incorrectly verifies, the cryptographic signature for data. As an impact it is known to affect integrity. CVE summarizes:

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.

The weakness was shared 08/30/2023 as GHSA-8fjr-hghr-4m99. The advisory is available at github.com. This vulnerability was named CVE-2023-36811 since 06/27/2023. The technical details are unknown and an exploit is not available.

Upgrading to version 1.2.5 eliminates this vulnerability. Applying the patch 3eb070191da10c2d3f7bc6484cf3d51c3045f884 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

• Backup Software

Name

• borgbackup

Version

• 1.2.0
• 1.2.1
• 1.2.2
• 1.2.3
• 1.2.4

License

• open-source

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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