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CVE-2015-2731: Mozilla Firefox: Use after free

CVE-2015-2731 has a CVSS v2 base score of 10.0 (the maximum on that scale) and affects Mozilla Firefox, along with 1 other product in NVD’s configuration data. Per its scoring, it can be exploited over the network, without authentication. The scored impact on confidentiality, integrity and availability is the highest available.

Vulnerability description

Use-after-free vulnerability in the CSPService::ShouldLoad function in the microtask implementation in Mozilla Firefox before 39.0, Firefox ESR 38.x before 38.1, and Thunderbird before 38.1 allows remote attackers to execute arbitrary code by leveraging client-side JavaScript that triggers removal of a DOM object on the basis of a Content Policy.

Severity breakdown

CVSS v2.0 10.0: AV:N/AC:L/Au:N/C:C/I:C/A:C

  • Access vector: Network. Exploitable remotely over the network.
  • Access complexity: Low. No special conditions are required.
  • Authentication: None. No authentication is needed.
  • Confidentiality impact: Complete. Total information disclosure.
  • Integrity impact: Complete. Total loss of integrity.
  • Availability impact: Complete. Total shutdown of the component.

Affected products

  • Mozilla Firefox: up to and including 38.1.0; 31.0; 31.1.0; 31.1.1; 31.3.0; 31.5.1; 31.5.2; 31.5.3; 38.0
  • Mozilla Thunderbird: up to and including 38.0.1
  • Mozilla Firefox Esr: 31.1; 31.2; 31.3; 31.4; 31.5; 31.6.0; 31.7.0
  • Oracle Solaris: 11.3

References