CVE-2003-1083 in Monit
Summary
by MITRE
Stack-based buffer overflow in Monit 1.4 to 4.1 allows remote attackers to execute arbitrary code via a long HTTP request.
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Analysis
by VulDB Data Team • 11/18/2024
The vulnerability identified as CVE-2003-1083 represents a critical stack-based buffer overflow flaw affecting Monit versions 1.4 through 4.1. This issue resides within the HTTP request handling mechanism of the Monit monitoring daemon, which is widely deployed for system and network monitoring across Unix-like operating systems. The vulnerability stems from insufficient input validation when processing HTTP requests, creating a condition where an attacker can manipulate the stack memory layout through crafted malicious input. The affected Monit versions were commonly used in enterprise environments for automated system monitoring, making this vulnerability particularly dangerous as it could be exploited remotely without authentication.
The technical implementation of this buffer overflow occurs when Monit processes HTTP requests containing excessively long data payloads. The software fails to properly validate the length of incoming HTTP headers or request data, allowing an attacker to overflow the allocated stack buffer and overwrite adjacent memory locations. This memory corruption can be leveraged to overwrite return addresses, function pointers, or other critical control data structures within the program's execution context. The vulnerability specifically affects the HTTP server component of Monit that listens for incoming connections, making it accessible to remote attackers who can send malicious HTTP requests to the monitored system. The flaw directly maps to CWE-121 Stack-based Buffer Overflow, which is classified as a high-severity weakness in the Common Weakness Enumeration catalog. According to MITRE ATT&CK framework, this vulnerability would be categorized under T1190 Exploit Public-Facing Application, as it targets a publicly accessible service component.
The operational impact of this vulnerability extends beyond simple code execution, as it enables attackers to gain full control over the affected system running the vulnerable Monit version. Successful exploitation could allow threat actors to install backdoors, modify system files, escalate privileges, or establish persistent access to monitored environments. The vulnerability affects systems where Monit is configured to listen on network interfaces, particularly those exposed to untrusted networks or internet-facing services. Organizations using Monit for critical infrastructure monitoring would be especially vulnerable, as the compromise of the monitoring system could lead to complete loss of visibility into system health and security events. The attack surface is particularly broad given that Monit was commonly deployed across various Unix and Linux distributions, making the potential impact widespread across different organizational environments.
Mitigation strategies for CVE-2003-1083 should prioritize immediate patching of all affected Monit installations to versions 4.2 or later, which contain the necessary fixes for the buffer overflow condition. Network administrators should implement firewall rules to restrict access to Monit's HTTP interface, limiting exposure to trusted networks only. Additionally, monitoring for unusual HTTP traffic patterns or attempted exploitation attempts should be enabled through intrusion detection systems. The vulnerability highlights the importance of input validation and proper bounds checking in network services, as recommended by security best practices outlined in the OWASP Top Ten and NIST Cybersecurity Framework. Organizations should also consider implementing network segmentation to isolate monitoring systems from critical production environments, reducing the potential impact of successful exploitation. Regular security assessments and vulnerability scanning should be conducted to identify other potentially affected services or applications that may exhibit similar buffer overflow characteristics, as this type of vulnerability remains prevalent in legacy software implementations.