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Vulnerability · Published Mar 6, 2023 · Assigned by GitHub_M

CVE-2023-26054Credentials inlined to Git URLs could end up in provenance attestation in BuildKit

Medium 6.5

In plain English

A medium-severity information exposure in buildkit from moby. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.0% (higher than 64% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)1.0%top 36.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

BuildKit is a toolkit for converting source code to build artifacts in an efficient, expressive and repeatable manner. In affected versions when the user sends a build request that contains a Git URL that contains credentials and the build creates a provenance attestation describing that build, these credentials could be visible from the provenance attestation. Git URL can be passed in two ways: 1) Invoking build directly from a URL with credentials. 2) If the client sends additional version control system (VCS) info hint parameters on builds from a local source. Usually, that would mean reading the origin URL from `.git/config` file. When a build is performed under specific conditions where credentials were passed to BuildKit they may be visible to everyone who has access to provenance attestation. Provenance attestations and VCS info hints were added in version v0.11.0. Previous versions are not vulnerable. In v0.10, when building directly from Git URL, the same URL could be visible in `BuildInfo` structure that is a predecessor of Provenance attestations. Previous versions are not vulnerable. This bug has been fixed in v0.11.4. Users are advised to upgrade. Users unable to upgrade may disable VCS info hints by setting `BUILDX_GIT_INFO=0`. `buildctl` does not set VCS hints based on `.git` directory, and values would need to be passed manually with `--opt`.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.20docker23.0.2-r0ALPINE-CVE-2023-26054
Alpine:v3.21docker23.0.2-r0ALPINE-CVE-2023-26054
Alpine:v3.22docker23.0.2-r0ALPINE-CVE-2023-26054
Alpine:v3.23docker23.0.2-r0ALPINE-CVE-2023-26054
Alpine:v3.24docker23.0.2-r0ALPINE-CVE-2023-26054
Gogithub.com/moby/buildkit0.11.4GHSA-gc89-7gcr-jxqc
Ubuntu:22.04:LTSdocker.io-app24.0.5-0ubuntu1~22.04.1UBUNTU-CVE-2023-26054

Affected products (as reported)

VendorProductVersions
moby buildkit >= 0.10.0, < 0.11.4

Weakness: CWE-200 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

References