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Vulnerability · Published Aug 30, 2023 · Assigned by GitHub_M

CVE-2023-36811Archive spoofing vulnerability in borgbackup

Medium 4.7

In plain English

A medium-severity security flaw in borg from borgbackup. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 1% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)4.7Medium
Exploit odds (30 days)0.1%top 98.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.20borgbackup1.2.6-r0ALPINE-CVE-2023-36811
Alpine:v3.21borgbackup1.2.6-r0ALPINE-CVE-2023-36811
Alpine:v3.22borgbackup1.2.6-r0ALPINE-CVE-2023-36811
Alpine:v3.23borgbackup1.2.6-r0ALPINE-CVE-2023-36811
Alpine:v3.24borgbackup1.2.6-r0ALPINE-CVE-2023-36811
Debian:12borgbackupno fix listedDEBIAN-CVE-2023-36811
Debian:13borgbackup1.2.5-1DEBIAN-CVE-2023-36811
Debian:14borgbackup1.2.5-1DEBIAN-CVE-2023-36811
PyPIborgbackup1.2.5PYSEC-2023-164
PyPIborgbackup1.2.5GHSA-8fjr-hghr-4m99
Ubuntu:22.04:LTSborgbackupno fix listedUBUNTU-CVE-2023-36811
Ubuntu:24.04:LTSborgbackupno fix listedUBUNTU-CVE-2023-36811

Affected products (as reported)

VendorProductVersions
borgbackup borg < 1.2.5

Weakness: CWE-347 · Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N

References