CVE-2020-11991 — When using the StreamGenerator, the code parse a user-provided XML

When using the StreamGenerator, the code parse a user-provided XML. A specially crafted XML, including external system entities, could be used to access any file on the server system.

01What is this vulnerability?

When using the StreamGenerator, the code parse a user-provided XML. A specially crafted XML, including external system entities, could be used to access any file on the server system.

02Affected products

Vendor	Product	Versions
n	a / Apache Cocoon	Apache Cocoon 2.1.0 to 2.1.12

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2020-09-11T13:28:20.000Z
• Last modified: 2024-08-04T11:48:57.582Z

09References

• lists.apache.org — https://lists.apache.org/thread.html/r77add973ea521185e1a90aca00ba9dae7caa8d8b94…