Quantum Secular Labs / Blog / Advisories

CVE-2017-7664: Apache Openmeetings: Improper Restriction of XML External Entity Reference

CVE-2017-7664 is rated critical with a CVSS v3.0 base score of 10.0 and affects Apache Openmeetings. Per its scoring, it can be exploited over the network, without authentication, without any user interaction.

Vulnerability description

Uploaded XML documents were not correctly validated in Apache OpenMeetings 3.1.0.

Severity breakdown

CVSS v3.0 10.0: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:H

  • Attack vector: Network. Exploitable remotely over the network, with no need for local or physical access.
  • Attack complexity: Low. No special conditions; the attack can be repeated reliably.
  • Privileges required: None. No account or prior access is needed.
  • User interaction: None. No action from any user is needed.
  • Scope: Changed. Impact reaches beyond the vulnerable component to other resources.
  • Confidentiality impact: Low. Some information is exposed.
  • Integrity impact: High. Total loss of integrity; data or system state can be fully modified.
  • Availability impact: High. Total loss of availability; the component can be shut down.

Underlying weakness

CWE-611: Improper Restriction of XML External Entity Reference

The product processes an XML document that can contain XML entities with URIs that resolve to documents outside of the intended sphere of control, causing the product to embed incorrect documents into its output.

Affected products

  • Apache Openmeetings: 3.1.0; 3.1.1; 3.1.2; 3.1.3; 3.1.4; 3.1.5; 3.2.0; 3.2.1

References