Quantum Secular Labs / Blog / Advisories

CVE-2016-1962: Mozilla Firefox: Use after free

CVE-2016-1962 is rated critical with a CVSS v3.0 base score of 9.8 and affects Mozilla Firefox, along with 2 other products in NVD’s configuration data. Per its scoring, it can be exploited over the network, without authentication, without any user interaction. The scored impact on confidentiality, integrity and availability is the highest available.

Vulnerability description

Use-after-free vulnerability in the mozilla::DataChannelConnection::Close function in Mozilla Firefox before 45.0 and Firefox ESR 38.x before 38.7 allows remote attackers to execute arbitrary code by leveraging mishandling of WebRTC data-channel connections.

Severity breakdown

CVSS v3.0 9.8: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/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: Unchanged. Impact stays within the vulnerable component.
  • Confidentiality impact: High. Total loss of confidentiality; sensitive data can be fully disclosed.
  • 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.

Affected products

  • Mozilla Firefox: up to and including 44.0.2; 38.0; 38.0.1; 38.0.5; 38.1.0; 38.1.1; 38.2.0; 38.2.1; 38.3.0; 38.4.0; 38.5.0; 38.5.1
  • Opensuse: 13.1
  • Oracle Linux: 5.0; 6; 7

References