CVE-2008-0304 in SeaMonkey
Summary
by MITRE
Heap-based buffer overflow in Mozilla Thunderbird before 2.0.0.12 and SeaMonkey before 1.1.8 might allow remote attackers to execute arbitrary code via a crafted external-body MIME type in an e-mail message, related to an incorrect memory allocation during message preview.
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Analysis
by VulDB Data Team • 12/09/2024
This vulnerability represents a critical heap-based buffer overflow in Mozilla Thunderbird and SeaMonkey email clients that existed prior to versions 2.0.0.12 and 1.1.8 respectively. The flaw specifically manifests when processing crafted external-body MIME types within email messages, creating a scenario where remote attackers can potentially execute arbitrary code on affected systems. The vulnerability stems from improper memory allocation handling during the message preview functionality, where the application fails to properly validate the size of incoming data before allocating heap memory for storage.
The technical implementation of this vulnerability involves the manipulation of MIME (Multipurpose Internet Mail Extensions) headers within email messages, specifically targeting the external-body parameter that references external resources. When Thunderbird or SeaMonkey encounters a maliciously crafted external-body MIME type, the application's parsing logic incorrectly calculates the required memory allocation, leading to a buffer overflow condition in the heap memory space. This memory corruption can be exploited to overwrite adjacent memory locations and potentially redirect program execution flow to attacker-controlled code.
From an operational perspective, this vulnerability presents a significant risk to email users who may inadvertently open maliciously crafted emails containing the specially formatted external-body MIME types. The attack vector requires no user interaction beyond simply viewing the email message in the preview pane, making it particularly dangerous as it can be exploited through passive email viewing. The remote code execution capability means that attackers can gain full control of the affected system, potentially leading to data theft, system compromise, or further network infiltration. This vulnerability aligns with CWE-121 Heap-based Buffer Overflow, which specifically addresses buffer overflows occurring in heap memory regions.
The impact of this vulnerability extends beyond individual user compromise to potentially affect entire email infrastructure and organizational security postures. Organizations relying on these email clients for business communications face significant risk from spear-phishing campaigns or mass email attacks that could leverage this vulnerability. Security professionals should consider this issue in the context of the ATT&CK framework, particularly under the T1190 - Exploit Public-Facing Application and T1059 - Command and Scripting Interpreter tactics, as it represents a classic example of a remote code execution vulnerability in a widely deployed application.
Mitigation strategies should include immediate deployment of security patches to upgrade to versions 2.0.0.12 or later for Thunderbird and 1.1.8 or later for SeaMonkey. Organizations should also implement email filtering solutions that can detect and block emails containing suspicious external-body MIME structures. Network administrators should consider disabling external content loading in email clients and implementing strict MIME validation policies. Additionally, user education regarding the dangers of opening suspicious emails and the importance of keeping software updated remains crucial in defending against this type of attack vector.