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CVE-2009-1571: Mozilla Firefox: Use after free

CVE-2009-1571 has a CVSS v2 base score of 10.0 (the maximum on that scale) and affects Mozilla Firefox. 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 HTML parser in Mozilla Firefox 3.0.x before 3.0.18 and 3.5.x before 3.5.8, Thunderbird before 3.0.2, and SeaMonkey before 2.0.3 allows remote attackers to execute arbitrary code via unspecified method calls that attempt to access freed objects in low-memory situations.

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.

Underlying weakness

CWE-94: Improper Control of Generation of Code

The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.

Affected products

Mozilla Firefox: 3.0; 3.0 alpha; 3.0 beta2; 3.0 beta5; 3.0.1; 3.0.2; 3.0.3; 3.0.4; 3.0.5; 3.0.6; 3.0.7; 3.0.8
Mozilla Seamonkey: 1.0; 1.0 alpha; 1.0 beta; 1.0.1; 1.0.2; 1.0.3; 1.0.4; 1.0.5; 1.0.6; 1.0.7; 1.0.8; 1.0.9