CVE-2004-0105 in Metamail
Summary
by MITRE
Multiple buffer overflows in Metamail 2.7 and earlier allow remote attackers to execute arbitrary code.
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Analysis
by VulDB Data Team • 11/19/2024
The vulnerability identified as CVE-2004-0105 represents a critical security flaw affecting Metamail version 2.7 and earlier releases. This issue manifests through multiple buffer overflow conditions that can be exploited by remote attackers to gain unauthorized code execution capabilities on affected systems. Metamail, a widely used email handling utility in the late 1990s and early 2000s, was particularly susceptible to these vulnerabilities due to its handling of email message formats and attachments. The buffer overflows occur when the application processes malformed email content without proper input validation, creating opportunities for attackers to craft malicious payloads that exceed allocated memory buffers. These vulnerabilities are classified under CWE-121 as stack-based buffer overflow conditions, where attacker-controlled data can overwrite adjacent memory locations including return addresses and function pointers. The exploitation potential of these buffer overflows aligns with ATT&CK technique T1059.007 for command and scripting interpreter execution, as successful exploitation would enable attackers to execute arbitrary code with the privileges of the affected process. The attack surface is particularly concerning as Metamail was commonly used in email processing pipelines, making it a prime target for remote exploitation through email-based attack vectors.
The technical implementation of these buffer overflows stems from insufficient bounds checking within Metamail's email parsing routines. When processing email headers, message bodies, or attachment data, the application fails to validate the length of incoming data against allocated buffer sizes, allowing attackers to overflow these buffers and potentially overwrite critical program execution flow. The vulnerability manifests in multiple locations within the application's codebase where string operations are performed without proper input sanitization. This type of vulnerability is particularly dangerous because it can be triggered through normal email processing operations, requiring no special privileges from the attacker beyond the ability to send email messages to a target system. The buffer overflow conditions can be exploited to overwrite stack canaries, return addresses, or other critical memory segments, enabling attackers to redirect program execution to malicious code injected into the overflowed buffer space. The exploitation process typically involves crafting specially formatted email messages containing oversized data fields that trigger the buffer overflow conditions during normal message processing.
The operational impact of CVE-2004-0105 extends beyond simple code execution capabilities, as successful exploitation can lead to complete system compromise and persistent access. Attackers leveraging these vulnerabilities can establish backdoors, escalate privileges, or deploy additional malicious payloads through the compromised Metamail process. The widespread adoption of Metamail in various email processing environments means that a single exploited system could serve as a foothold for broader network infiltration. Organizations using vulnerable versions of Metamail face significant risk of data breaches, system compromise, and potential lateral movement within their network infrastructure. The vulnerability also impacts email security protocols and can be used to bypass certain security controls that rely on proper email processing behavior. Given that Metamail was often integrated into larger email infrastructure components, the exploitation could potentially affect multiple systems simultaneously. The vulnerability's remote nature means that attackers can exploit it without requiring physical access to target systems, making it particularly concerning for organizations with email-based attack surface exposure. Network security monitoring systems may not immediately detect exploitation attempts as they can appear as legitimate email processing activities.
Mitigation strategies for CVE-2004-0105 require immediate action to address the root cause vulnerabilities within Metamail installations. The primary recommendation involves upgrading to Metamail versions that contain proper input validation and buffer management fixes, as version 2.8 and later releases address these specific buffer overflow conditions. Organizations should implement network segmentation and email filtering controls to reduce exposure to potentially malicious email content that could trigger these vulnerabilities. Security patches and updates should be applied immediately to all systems running vulnerable Metamail versions, with particular attention to email servers and gateway systems. Additional defensive measures include implementing email content filtering that can detect and block malformed email content likely to trigger buffer overflows, as well as monitoring email processing logs for unusual patterns that might indicate exploitation attempts. System administrators should consider disabling unnecessary email processing features that might expose vulnerable code paths, and implement strict input validation for all email-related processing functions. The mitigation approach should also include regular vulnerability assessments to identify other potential buffer overflow conditions within the email infrastructure, as similar vulnerabilities may exist in other components of the email processing stack. Security teams should develop incident response procedures specifically addressing potential exploitation of these buffer overflow vulnerabilities, including forensic analysis capabilities for detecting and analyzing compromise indicators.