CVE-2011-3651 in Firefox
Summary
by MITRE
Multiple unspecified vulnerabilities in the browser engine in Mozilla Firefox 7.0 and Thunderbird 7.0 allow remote attackers to cause a denial of service (memory corruption and application crash) or possibly execute arbitrary code via unknown vectors.
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Analysis
by VulDB Data Team • 11/26/2021
The vulnerability identified as CVE-2011-3651 represents a critical security flaw affecting Mozilla Firefox 7.0 and Thunderbird 7.0 browser engines, demonstrating the inherent risks associated with complex software components that handle diverse input sources. This vulnerability class falls under the broader category of memory corruption issues that can lead to severe consequences including application instability and potential code execution. The unspecified nature of the vulnerability vectors indicates that attackers could exploit multiple distinct pathways within the browser engine, making comprehensive mitigation challenging and highlighting the complexity of modern web browser security architectures.
The technical flaw manifests as memory corruption within the browser engine's handling of various input data types, which can result in unpredictable application behavior when processing maliciously crafted content. This type of vulnerability typically arises from inadequate input validation, buffer overflows, or improper memory management practices within the software's core rendering and processing components. The vulnerability's impact extends beyond simple denial of service to potentially enabling remote code execution, which represents a significant escalation in threat severity according to common vulnerability scoring systems. Such memory corruption vulnerabilities are often categorized under CWE-122 (Heap Overflow) or CWE-787 (Out-of-bounds Write) depending on the specific implementation flaw.
From an operational perspective, this vulnerability presents a substantial risk to organizations relying on these browser versions, as attackers could leverage the flaw to compromise user systems without requiring any local privileges or user interaction beyond visiting a malicious webpage. The potential for remote code execution means that successful exploitation could result in complete system compromise, data exfiltration, or establishment of persistent backdoors within affected environments. This aligns with ATT&CK technique T1203 (Exploitation for Client Execution) and represents a classic example of how browser engine vulnerabilities can serve as initial access vectors in broader attack campaigns. The vulnerability's presence in both Firefox and Thunderbird indicates a shared underlying component architecture that makes multiple products susceptible to the same flaw, emphasizing the importance of coordinated security updates across software ecosystems.
Organizations should implement immediate mitigation strategies including mandatory security updates to the latest available versions of Firefox and Thunderbird, which would address the underlying memory corruption issues through proper input validation and memory management improvements. Network-based mitigations such as web application firewalls and content filtering solutions can provide additional layers of protection, while user education regarding safe browsing practices remains essential. Regular security assessments and vulnerability scanning should be conducted to identify any remaining exposure risks, and incident response procedures should be updated to account for potential exploitation of similar memory corruption vulnerabilities. The vulnerability also underscores the importance of maintaining up-to-date threat intelligence feeds and security patches to protect against emerging threats targeting browser engine components.