CVE-2002-1251 in log2mail
Summary
by MITRE
Buffer overflow in log2mail before 0.2.5.1 allows remote attackers to execute arbitrary code via a long log message.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 06/30/2024
The vulnerability identified as CVE-2002-1251 represents a critical buffer overflow flaw in the log2mail utility version 0.2.5.0 and earlier. This software component serves as a logging tool that processes system log messages and forwards them via email notifications. The buffer overflow occurs when the application receives a log message that exceeds the allocated buffer space, creating an exploitable condition that can be remotely triggered by malicious actors. The flaw stems from inadequate input validation and bounds checking within the log message processing routine, allowing attackers to overflow the fixed-size buffer and overwrite adjacent memory locations. This vulnerability falls under the CWE-121 category of stack-based buffer overflow, which is classified as a fundamental memory safety issue that has been consistently exploited in various security incidents throughout the history of software development. The affected system components typically operate in environments where log monitoring and alerting are critical for system administration and security operations, making this vulnerability particularly dangerous as it can be leveraged to gain unauthorized control over systems that rely on this utility for log processing.
The technical exploitation of this vulnerability requires remote attackers to craft and send a specially formatted log message that exceeds the buffer capacity, typically measured in bytes. When the log2mail utility processes this oversized message, the buffer overflow can lead to arbitrary code execution with the privileges of the user running the application, which often includes system administrator or root privileges. The attack vector is particularly concerning because it does not require authentication, making it a remote code execution vulnerability that can be exploited over network connections. The memory corruption resulting from this overflow can be manipulated to redirect program execution flow, potentially allowing attackers to inject malicious code or overwrite critical program structures. The vulnerability demonstrates a classic example of insufficient input sanitization, where the application fails to properly validate the length of incoming data before attempting to store it in fixed-size memory buffers. This flaw aligns with ATT&CK technique T1059.007 for command and script injection, as successful exploitation would enable adversaries to execute arbitrary commands on the compromised system. The vulnerability's impact is amplified by the fact that log messages are often processed automatically and may contain untrusted data from various sources within networked environments, creating multiple potential attack entry points.
The operational impact of CVE-2002-1251 extends beyond immediate code execution capabilities to encompass broader system compromise and potential data breaches. Systems utilizing vulnerable log2mail versions may become fully compromised when attackers successfully exploit this vulnerability, as the execution of arbitrary code can lead to complete system takeover. The vulnerability affects environments where automated log monitoring and alerting are critical components of system administration, potentially allowing attackers to establish persistent backdoors or exfiltrate sensitive information from the compromised systems. Organizations relying on this utility for security monitoring may experience false positives or missed security events due to the exploitation, as the overflow can corrupt the logging process itself. The vulnerability's remote nature means that attackers can exploit it from anywhere on the network, making it particularly dangerous for organizations with exposed systems or those that do not properly isolate their logging infrastructure. Additionally, the exploitation may be automated through scripts or tools designed for buffer overflow exploitation, increasing the potential for widespread compromise across multiple systems. Security teams may find their logging systems compromised, potentially leading to situations where legitimate security events are not properly recorded or reported, creating blind spots in incident response capabilities.
Mitigation strategies for CVE-2002-1251 must focus on immediate remediation through software updates and comprehensive system hardening. The primary and most effective solution involves upgrading to log2mail version 0.2.5.1 or later, which includes proper buffer size validation and bounds checking mechanisms. Organizations should implement network segmentation to limit access to systems running vulnerable log2mail versions and ensure that only trusted sources can send log messages to these systems. Input validation should be strengthened at all levels of the logging infrastructure, including implementing maximum message length limits and sanitizing all log data before processing. System administrators should consider implementing intrusion detection systems that can monitor for suspicious log message patterns that may indicate exploitation attempts. Regular security audits and vulnerability assessments should include checks for outdated logging utilities and other system components that may be vulnerable to similar buffer overflow conditions. The implementation of proper memory protection mechanisms such as stack canaries, address space layout randomization, and non-executable stack protections can provide additional defense-in-depth measures. Organizations should also establish robust incident response procedures that include monitoring for signs of exploitation and ensuring that log data remains intact and trustworthy for security analysis purposes. The vulnerability serves as a reminder of the importance of keeping security-critical software components updated and the necessity of implementing proper input validation and bounds checking in all software applications, particularly those handling untrusted data from network sources.