SB2021061540 - XML Entity Expansion in Opencast

Description

This security bulletin contains information about 1 vulnerability.

1) XML Entity Expansion (CVE-ID: CVE-2021-32623)

CWE-ID: CWE-776 - Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a remote user to cause a denial of service.

The vulnerability exists due to uncontrolled resource consumption in the XML parser when processing a crafted XML request. A remote user can send a specially crafted XML document to cause a denial of service.

Exploitation requires ingest privileges, and a single HTTP request can trigger the issue.

Remediation

Install update from vendor's website.

References

• https://github.com/opencast/opencast/security/advisories/GHSA-9gwx-9cwp-5c2m
• https://github.com/advisories/GHSA-9gwx-9cwp-5c2m