Quantum Secular Labs / Blog / Advisories

CVE-2015-2733: Mozilla Firefox: Use after free

CVE-2015-2733 has a CVSS v2 base score of 10.0 (the maximum on that scale) and affects Mozilla Firefox, along with 3 other products 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 CanonicalizeXPCOMParticipant function in Mozilla Firefox before 39.0 and Firefox ESR 31.x before 31.8 and 38.x before 38.1 allows remote attackers to execute arbitrary code via vectors involving attachment of an XMLHttpRequest object to a dedicated worker.

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 Firefox Esr: 31.1; 31.2; 31.3; 31.4; 31.5; 31.6.0; 31.7.0
  • Oracle Solaris: 11.3
  • Novell Suse Linux Enterprise Desktop: 11 sp4; 12.0
  • Novell Suse Linux Enterprise Server: 12.0

References