CVE-2005-1520 in Mailutils
Summary
by MITRE
Buffer overflow in the header_get_field_name function in header.c for GNU Mailutils 0.5 and 0.6, and other versions before 0.6.90, allows remote attackers to execute arbitrary code via a crafted e-mail.
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Analysis
by VulDB Data Team • 01/03/2025
The vulnerability identified as CVE-2005-1520 represents a critical buffer overflow flaw within the GNU Mailutils email processing library. This issue affects versions 0.5 and 0.6 of the software, with the vulnerability persisting through versions prior to 0.6.90. The flaw specifically resides in the header_get_field_name function located within the header.c source file, making it a prime target for remote code execution attacks. The vulnerability stems from inadequate input validation and bounds checking during the processing of email headers, creating a scenario where maliciously crafted email messages can trigger memory corruption. This type of vulnerability falls under the Common Weakness Enumeration category CWE-121, which describes heap-based buffer overflow conditions where insufficient bounds checking allows attackers to overwrite adjacent memory locations. The attack vector is particularly dangerous as it enables remote code execution without requiring authentication, making it an attractive target for automated exploitation campaigns.
The technical implementation of this vulnerability occurs when the header_get_field_name function processes email header fields without proper bounds checking on the input data. When a malformed email message containing crafted header data is processed, the function fails to validate the length of the incoming field name, allowing an attacker to overflow the allocated buffer space. This overflow can overwrite critical memory locations including return addresses, function pointers, or other control data structures within the program's execution context. The exploitation process typically involves crafting a specially formatted email header that, when parsed by the vulnerable Mailutils library, triggers the buffer overflow condition. The resulting memory corruption can be leveraged to redirect program execution to malicious code injected by the attacker, effectively allowing remote code execution on systems running vulnerable versions of GNU Mailutils.
The operational impact of CVE-2005-1520 extends beyond simple remote code execution to encompass potential system compromise and data breach scenarios. Systems utilizing vulnerable Mailutils versions for email processing, including mail servers, email clients, and email filtering systems, become susceptible to exploitation by remote attackers. The vulnerability's presence in widely used email processing libraries means that the attack surface is extensive, potentially affecting organizations of all sizes that rely on GNU Mailutils for email handling. The remote nature of the attack eliminates the need for physical access or local privileges, making it particularly dangerous for networked systems. Security researchers have categorized this vulnerability under the MITRE ATT&CK framework as part of the T1059.007 technique for command and scripting interpreter, where attackers can leverage the remote code execution capability to establish persistent access, escalate privileges, or deploy additional malware components. Organizations running vulnerable systems face significant risk of unauthorized access, data exfiltration, and potential lateral movement within their networks.
Mitigation strategies for CVE-2005-1520 primarily focus on upgrading to patched versions of GNU Mailutils, specifically version 0.6.90 or later where the buffer overflow vulnerability has been addressed. System administrators should conduct comprehensive inventory assessments to identify all systems running vulnerable versions and prioritize patch deployment across the organization. Network-level defenses such as email filtering systems and intrusion detection/prevention systems can provide additional layers of protection by monitoring for suspicious email patterns that may indicate exploitation attempts. Input validation and sanitization measures should be implemented at multiple levels to reduce the effectiveness of potential exploitation attempts, even if the primary patch is not immediately available. Organizations should also consider implementing network segmentation and access controls to limit the potential impact of successful exploitation. The vulnerability highlights the importance of maintaining up-to-date software libraries and implementing robust security practices including regular vulnerability assessments, patch management processes, and security monitoring to detect and respond to exploitation attempts. Additionally, the use of security-focused email processing libraries and the implementation of email security standards such as those defined by the IETF can help reduce the attack surface for similar vulnerabilities in the future.