CVE-2012-4186 in Firefox
Summary
by MITRE
Heap-based buffer overflow in the nsWaveReader::DecodeAudioData function in Mozilla Firefox before 16.0, Firefox ESR 10.x before 10.0.8, Thunderbird before 16.0, Thunderbird ESR 10.x before 10.0.8, and SeaMonkey before 2.13 allows remote attackers to execute arbitrary code via unspecified vectors.
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Analysis
by VulDB Data Team • 10/22/2024
The heap-based buffer overflow vulnerability identified as CVE-2012-4186 resides within the nsWaveReader::DecodeAudioData function of Mozilla Firefox and related applications including Thunderbird and SeaMonkey. This critical flaw affects versions prior to Firefox 16.0 and Firefox ESR 10.x before 10.0.8, Thunderbird 16.0 and earlier, Thunderbird ESR 10.x before 10.0.8, and SeaMonkey 2.13 and earlier. The vulnerability stems from inadequate input validation and memory management during audio data processing, specifically when handling wave format audio files. The flaw manifests when the application attempts to decode audio data without properly bounds-checking the input buffer size against the allocated heap memory space.
This vulnerability represents a classic heap overflow condition that can be exploited by remote attackers to execute arbitrary code on affected systems. The technical implementation involves the nsWaveReader component responsible for parsing and decoding wave audio files, which fails to validate the size of incoming audio data before attempting to copy it into heap-allocated buffers. When maliciously crafted audio files are processed, the insufficient boundary checks allow attackers to overwrite adjacent heap memory regions, potentially leading to stack corruption, memory pointer manipulation, or code execution. The vulnerability operates at the application layer and does not require any user interaction beyond opening or processing the malicious audio file.
The operational impact of this vulnerability extends beyond simple code execution to encompass potential system compromise and data theft. Attackers leveraging this flaw can gain full control over affected systems, enabling them to install malware, modify system files, or establish persistent backdoors. The attack surface is broad given that these applications are widely used for email and web browsing, making the exploitation vector highly accessible. The vulnerability's classification under CWE-121 heap-based buffer overflow aligns with the specific memory corruption pattern observed, while its exploitation fits within the ATT&CK framework under the T1059 technique for command and scripting interpreter. The affected applications process multimedia content as part of their normal operations, making the attack surface particularly concerning for enterprise environments.
Mitigation strategies for CVE-2012-4186 include immediate patching of all affected software versions to the latest releases containing the memory safety fixes. Organizations should implement network segmentation and content filtering to prevent processing of untrusted audio files, particularly in email systems where Thunderbird and Firefox are commonly deployed. Security teams should enable automatic updates where possible and conduct comprehensive vulnerability assessments to identify any systems running outdated versions. Additional defensive measures include deploying intrusion detection systems that can identify suspicious file processing patterns and implementing strict access controls for applications handling multimedia content. The remediation process should also involve regular security audits of web and email applications to ensure compliance with security baselines and prevent similar vulnerabilities from emerging in future releases.