T08 · Insecure Dependencies
- Location
SKILL.md:127- Finding
Unpinned Third-Party Debug Images Execute Mutable External Content
- Content
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Vulnerability Details
File Location:
SKILL.md:127,SKILL.md:172, andSKILL.md:206-209
Vulnerability Type: Supply-chain exposure through unpinned container images
Risk Level: MediumVulnerable code snippets:
bash # Attach a debug container to the same namespace docker run -it --pid=container:my-container --net=container:my-container busybox shbash # If curl/ping not available in container, install or use a debug container: docker run --rm --network container:my-container curlimages/curl curl -s http://localhost:8080bash # If tcpdump not available, use a sidecar docker run --rm --net=container:my-container nicolaka/netshoot tcpdump -i eth0 -n # netshoot has: tcpdump, curl, nslookup, netstat, iperf, etc. docker run --rm --net=container:my-container nicolaka/netshoot bashTechnical Analysis
The documented commands run third-party images without pinning them to reviewed, immutable SHA-256 digests. An unqualified image such as
busybox,curlimages/curl, ornicolaka/netshootnormally resolves to a mutable tag. Consequently, the image content executed by a future user may differ from the content reviewed when the Skill was published.This is especially sensitive because these debug images are attached directly to a target container's network namespace, and in one case its PID namespace. Code in a compromised image could inspect network traffic, connect to internal services reachable by the target container, enumerate processes, or interfere with processes where namespace permissions permit. The issue is a supply-chain weakness rather than evidence that the currently referenced projects are malicious.
Attack Path
- An attacker compromises an upstream image publisher, registry account, build pipeline, or mutable image tag.
- The attacker publishes a modified image under one of the image references used by the Skill.
- An operator follows the document ...[truncated 1232 chars]
- Remediation
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Remediation Suggestions
- Pin every debugging image to a reviewed immutable digest, for example:
bash docker run --rm \ --net=container:my-container \ registry.example/netshoot@sha256:<reviewed-digest> \ tcpdump -i eth0 -n - Specify the complete trusted registry and repository name rather than relying on implicit registry resolution.
- Verify image signatures and provenance with an approved mechanism such as Docker Content Trust, Notary, or Sigstore/Cosign.
- Maintain an allowlist of approved debugging images and periodically scan them for vulnerabilities and unexpected changes.
- Prefer internally mirrored images whose digests are controlled and reviewed by the organization.
- Apply least privilege: use network or PID namespace sharing only when required, run with a non-root user where practical, drop unnecessary capabilities, use a read-only root filesystem, and apply seccomp/AppArmor/SELinux restrictions.
- Explain the security implications immediately beside each namespace-sharing command so operators can make an informed decision before execution.
- Pin every debugging image to a reviewed immutable digest, for example: