Apache Storm Worker Launcher: Local Privilege Escalation to Root via Container Command Files Chowned to the Tenant

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-82430
StatePUBLISHED
Assignerapache
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-14 15:17:09 UTC
Updated2026-09-14 16:17:20 UTC
DescriptionDescription When launching a Docker or OCI worker, the setuid-root `worker-launcher` first changes ownership of the entire worker directory to the untrusted topology user, and only afterwards reads and acts on the command file that the supervisor wrote into that same directory. The file is opened without `O_NOFOLLOW` and without re-verifying its owner, so between the ownership change and the read the tenant can replace its contents. For the Docker path the parsed command is executed with real uid 0, and the command sanitiser is not a privilege boundary: it admits `-v` with an arbitrary source, `--device`, `--cap-add`, `--security-opt`, `--user` and `--net`, and copies positional arguments through verbatim. A rewritten file therefore yields an attacker-authored, root-equivalent container invocation with the host filesystem available. For the OCI path the same rewrite window applies, and mount validation is structural only, with no source or destination allow-list, so arbitrary host paths can be bind-mounted read-write into the container. The `username` field of the command file is likewise attacker-settable and is checked only against non-root and minimum-uid rules, permitting execution as another tenant's uid. Mitigation Upgrade to 3.1.0, where the command file is validated before the ownership change and re-verified on open, and where mount sources and destinations are constrained by configuration. Users who cannot upgrade immediately should disable Docker and OCI worker isolation, or restrict topology submission on affected supervisors to trusted principals. Note that the launcher must be rebuilt and reinstalled after upgrading. Credit The ASF -- found using Claude agents to study the security of open-source projects, validated and reported by Apache Storm.

Risk And Classification

Problem Types: CWE-367 | CWE-367 CWE-367 Time-of-check time-of-use (TOCTOU) race condition

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Apache Software Foundation Apache Storm Worker Launcher affected 3.0.0 3.1.0 semver Not specified

References

ReferenceSourceLinkTags
www.openwall.com/lists/oss-security/2026/09/13/10 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
lists.apache.org/thread/8d5pkn486p8vrz5klg6onk5r8k9sd9lv [email protected] lists.apache.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: The ASF using Claude Agents (en)

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