Description
apko allows users to build and publish OCI container images built from apk packages. Prior to version 1.2.7, apko verifies the signature on APKINDEX.tar.gz but never compares individually downloaded .apk packages against the checksum recorded in the signed index. The checksum is parsed and available via ChecksumString(), and the downloaded package control hash is computed, but the two values are never compared in getPackageImpl(). Mismatched packages are silently accepted. An attacker who can substitute download responses (compromised mirror, HTTP repository, poisoned CDN cache) can install arbitrary packages into built images. This issue has been patched in version 1.2.7.
Problem types
CWE-345: Insufficient Verification of Data Authenticity
CWE-494: Download of Code Without Integrity Check
Product status
References
github.com/...v/apko/security/advisories/GHSA-hcwr-pq9g-rq3m
github.com/...ommit/a118c3d604107532b5525bd4bee2fb369a6228aa
github.com/chainguard-dev/apko/releases/tag/v1.2.7