CVE-2002-1279 in Masqmail
Summary
by MITRE
Multiple buffer overflows in conf.c for Masqmail 0.1.x before 0.1.17, and 0.2.x before 0.2.15, allow local users to gain privileges via certain entries in the configuration file (-C option).
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Analysis
by VulDB Data Team • 06/30/2024
The vulnerability described in CVE-2002-1279 represents a critical buffer overflow issue affecting Masqmail versions 0.1.x prior to 0.1.17 and 0.2.x prior to 0.2.15. This flaw exists within the configuration file processing functionality of the masqmail mail transfer agent, specifically in the conf.c source file. The vulnerability manifests when the application processes certain entries in configuration files provided through the command-line -C option, creating a scenario where malicious input can overwrite adjacent memory locations. This type of vulnerability falls under the CWE-121 category of stack-based buffer overflow, where insufficient bounds checking allows attackers to overwrite stack variables and potentially execute arbitrary code.
The technical exploitation of this vulnerability requires local user access and leverages the application's handling of configuration parameters. When masqmail processes a specially crafted configuration file through the -C option, the buffer overflow occurs during parsing operations where the application fails to validate the length of input data against the allocated buffer space. This allows an attacker to overwrite return addresses, function pointers, or other critical stack variables, potentially enabling privilege escalation from the current user context to a higher privilege level. The vulnerability is particularly dangerous because it operates at the local user level, meaning any user with access to the system can potentially exploit it to gain elevated privileges.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it represents a fundamental flaw in input validation and memory management within a critical system component. Masqmail, being a mail transfer agent, often runs with elevated privileges to properly handle mail routing and delivery functions, making successful exploitation particularly dangerous. The vulnerability affects multiple version lines of the software, indicating a persistent flaw in the codebase that required significant development effort to address. Attackers could potentially leverage this to gain root access on systems running affected versions, compromise mail services, or use the elevated privileges to establish persistent backdoors or further compromise the system.
Security mitigations for this vulnerability involve immediate patching of affected masqmail installations to versions 0.1.17 or 0.2.15 and later. System administrators should also implement strict input validation for configuration files, particularly those processed through command-line options, and consider restricting local user access to configuration files. The vulnerability demonstrates the importance of proper bounds checking and input validation in system software, aligning with ATT&CK technique T1068 for privilege escalation through local exploitation. Organizations should also implement regular security assessments of mail systems and ensure that all system components are kept up to date with security patches. The incident highlights the critical nature of validating user inputs and the potential consequences of insufficient memory boundary checking in network services and system utilities.