Quantum Secular Labs / Blog / Advisories

CVE-2018-12392: Mozilla Firefox: Denial of service

CVE-2018-12392 is rated critical with a CVSS v3.0 base score of 9.8 and affects Mozilla Firefox, along with 8 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

When manipulating user events in nested loops while opening a document through script, it is possible to trigger a potentially exploitable crash due to poor event handling. This vulnerability affects Firefox < 63, Firefox ESR < 60.3, and Thunderbird < 60.3.

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: before 60.3.0; before 63.0
  • Mozilla Thunderbird: before 60.3.0
  • Debian Linux: 8.0; 9.0
  • Canonical Ubuntu Linux: 14.04; 16.04; 18.04; 18.10
  • Red Hat Enterprise Linux Desktop: 6.0; 7.0
  • Red Hat Enterprise Linux Server: 6.0; 7.0
  • Red Hat Enterprise Linux Server Aus: 7.6
  • Red Hat Enterprise Linux Server Eus: 7.5; 7.6
  • Red Hat Enterprise Linux Server Tus: 7.6
  • Red Hat Enterprise Linux Workstation: 6.0; 7.0

References