CVE-2012-4215 in Firefox
Summary
by MITRE
Use-after-free vulnerability in the nsPlaintextEditor::FireClipboardEvent function in Mozilla Firefox before 17.0, Firefox ESR 10.x before 10.0.11, Thunderbird before 17.0, Thunderbird ESR 10.x before 10.0.11, and SeaMonkey before 2.14 allows remote attackers to execute arbitrary code or cause a denial of service (heap memory corruption) via unspecified vectors.
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Analysis
by VulDB Data Team • 10/22/2024
The vulnerability identified as CVE-2012-4215 represents a critical use-after-free condition within Mozilla Firefox's plaintext editor component, specifically affecting the nsPlaintextEditor::FireClipboardEvent function. This flaw exists in multiple Mozilla products including Firefox, Thunderbird, and SeaMonkey across various versions, creating widespread exposure across the browser ecosystem. The vulnerability stems from improper memory management where freed memory blocks are accessed after they have been deallocated, creating opportunities for malicious exploitation.
The technical nature of this vulnerability aligns with CWE-416, which categorizes use-after-free conditions as a fundamental memory safety issue. When the FireClipboardEvent function processes clipboard operations, it fails to properly manage object references, allowing attackers to manipulate memory state through carefully crafted input sequences. The flaw manifests during clipboard event handling operations where the application attempts to access memory that has already been freed, leading to heap corruption that can be leveraged for arbitrary code execution.
Operational impact of this vulnerability extends beyond simple denial of service scenarios to include complete system compromise. Remote attackers can exploit this condition by crafting malicious web content that triggers the vulnerable code path, potentially leading to privilege escalation or complete system control. The heap corruption resulting from this use-after-free condition can be exploited through return-oriented programming techniques or direct memory manipulation, making it particularly dangerous in modern exploit frameworks. This vulnerability affects not just individual user systems but represents a significant threat to enterprise environments where these browsers are widely deployed.
Mitigation strategies for CVE-2012-4215 primarily focus on immediate version updates to patched releases of affected Mozilla products. Organizations should prioritize deployment of Firefox 17.0, Thunderbird 17.0, and SeaMonkey 2.14, along with their respective ESR versions, to eliminate exposure to this vulnerability. Additional protective measures include implementing web application firewalls, restricting clipboard access through browser policies, and deploying memory corruption detection tools. The ATT&CK framework categorizes this vulnerability under T1059 for remote code execution and T1068 for privilege escalation techniques, emphasizing the need for comprehensive defensive measures beyond simple patching. Security teams should also consider implementing network monitoring to detect exploitation attempts and establish incident response procedures specifically addressing heap corruption vulnerabilities in browser components.