CVE-2004-2461 in gnubiff
Summary
by MITRE
Buffer overflow in pop3.c in gnubiff before 2.0.0 allows attackers to cause a denial of service (crash) and possibly execute arbitrary code.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 03/25/2019
The vulnerability identified as CVE-2004-2461 represents a critical buffer overflow flaw located within the pop3.c component of gnubiff version 2.0.0 and earlier. This issue arises from insufficient input validation when processing POP3 protocol responses, creating a scenario where maliciously crafted server responses can trigger memory corruption. The vulnerability specifically affects the handling of email server communications where gnubiff processes incoming POP3 messages, making it a significant concern for email notification systems that rely on this utility.
The technical implementation of this buffer overflow occurs when gnubiff receives malformed POP3 server responses that exceed the allocated buffer space in the pop3.c file. This flaw operates under CWE-121, which categorizes buffer overflow conditions where insufficient bounds checking allows attackers to overwrite adjacent memory locations. The vulnerability manifests when the application fails to properly validate the length of incoming data before copying it into fixed-size buffers, creating opportunities for both denial of service and potential code execution scenarios. Attackers can exploit this by crafting specially formatted POP3 server responses that cause the application to write beyond allocated memory boundaries.
From an operational perspective, this vulnerability presents substantial risk to systems utilizing gnubiff for email monitoring and notification services. The impact extends beyond simple service disruption to potentially allowing remote code execution, making it particularly dangerous in environments where the application runs with elevated privileges. The denial of service component can be leveraged to continuously crash the email notification service, while the code execution capability could enable attackers to gain unauthorized access to affected systems. This vulnerability directly maps to ATT&CK technique T1203, which covers exploitation of known vulnerabilities for privilege escalation and persistence.
Mitigation strategies for CVE-2004-2461 primarily focus on immediate version upgrading to gnubiff 2.0.0 or later, which contains the necessary patches to address the buffer overflow conditions. System administrators should also implement network-level protections such as firewall rules that limit access to POP3 servers and monitor for anomalous email traffic patterns. Input sanitization measures should be enhanced to validate all server responses before processing, and the application should be configured to run with minimal required privileges to limit potential damage from successful exploitation attempts. Additionally, regular security audits and vulnerability assessments should be conducted to identify similar buffer overflow conditions in other email processing utilities and system components.