Advisories for Golang/Github.com/Chainguard-Dev/Kaniko package

kaniko before v1.25.20 can send a Microsoft Entra ID (Azure AD) access token for Azure Resource Manager to a registry host an attacker controls. A Dockerfile that references an image on a lookalike host, such as FROM x.azurecr.io.attacker.com/img, is enough. The build needs no RUN instruction and never has to push. The flaw is in the Azure Container Registry (ACR) credential helper, github.com/chrismellard/docker-credential-acr-env. kaniko links it into the executor and …

kaniko unpacks build context archives using filepath.Join(dest, cleanedName) without enforcing that the final path stays within dest. A tar entry like ../outside.txt escapes the extraction root and writes files outside the destination directory. In environments with registry authentication, this can be chained with docker credential helpers to achieve code execution within the executor process. Affected versions >= 1.25.4, <= 1.25.9. Fix: Merged with PR #326 — uses securejoin for path …