CVE-2021-41110

CWL Viewer: deserialization of untrusted data can lead to complete takeover by an attacker

CVSS 9.1 CRITICALEPSS 2.7%CWE-502

Vexday Risk Score

28Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 9.1EPSS 2.7%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

01 Oct 2021Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

cwlviewer is a web application to view and share Common Workflow Language workflows. Versions prior to 1.3.1 contain a Deserialization of Untrusted Data vulnerability. Commit number f6066f09edb70033a2ce80200e9fa9e70a5c29de (dated 2021-09-30) contains a patch. There are no available workarounds aside from installing the patch. The SnakeYaml constructor, by default, allows any data to be parsed. To fix the issue the object needs to be created with a `SafeConstructor` object, as seen in the patch.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Affected products

common-workflow-language · cwlviewer

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References

https://github.com/common-workflow-language/cwlviewer/commit/f6066f09edb70033a2ce80200e9fa9e70a5c29de https://github.com/common-workflow-language/cwlviewer/security/advisories/GHSA-7g7j-f5g3-fqp7 https://www.fatalerrors.org/a/analysis-of-the-snakeyaml-deserialization-in-java-security.html