CVE-2002-1127 in OSF 1
Summary
by MITRE
Buffer overflow in uucp in Compaq Tru64/OSF1 3.x allows local users to execute arbitrary code via a long source (-s) command line parameter.
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Analysis
by VulDB Data Team • 06/29/2024
The vulnerability described in CVE-2002-1127 represents a critical buffer overflow flaw within the uucp utility of Compaq Tru64/OSF1 operating system version 3.x. This issue specifically affects the handling of command line parameters, particularly the source (-s) option, which creates a dangerous condition where insufficient input validation allows maliciously crafted parameters to overwrite adjacent memory locations. The uucp utility, which stands for Unix to Unix Copy Protocol, is a fundamental networking tool used for transferring files between Unix systems, making this vulnerability particularly concerning as it could be exploited by local users with existing system access to escalate privileges and execute arbitrary code with elevated privileges.
The technical implementation of this buffer overflow occurs when the uucp program processes the -s command line parameter without proper bounds checking or input validation. When a local attacker provides an excessively long source parameter, the program's internal buffer allocation fails to accommodate the input, resulting in memory corruption that can be leveraged to overwrite critical program variables, return addresses, or function pointers. This type of vulnerability falls under CWE-121, which specifically addresses stack-based buffer overflow conditions, and represents a classic example of how insufficient input validation can create exploitable conditions. The flaw exists at the system call level where user-supplied parameters are directly processed without adequate sanitization, creating a pathway for attackers to manipulate the program's execution flow.
The operational impact of this vulnerability extends beyond simple privilege escalation as it provides local attackers with the capability to execute arbitrary code with the privileges of the uucp process, which typically runs with elevated permissions. This could enable attackers to gain root access to the system, modify critical system files, establish persistent backdoors, or compromise the integrity of the entire operating environment. The vulnerability is particularly dangerous because it requires minimal privileges to exploit - only local access to the system is necessary, making it an attractive target for both malicious insiders and attackers who have already gained some level of system access. The attack vector is straightforward and reliable, as it simply requires the execution of a specially crafted uucp command with an overly long -s parameter, making it difficult to defend against through traditional network-based security measures.
Mitigation strategies for this vulnerability should focus on both immediate patching and defensive configuration measures. The primary solution involves applying the vendor-supplied security patches that correct the buffer handling in the uucp utility by implementing proper input validation and bounds checking for command line parameters. Organizations should also consider implementing discretionary access controls to limit local user access to uucp and related system utilities, as well as monitoring system logs for suspicious uucp command executions. From a defensive standpoint, this vulnerability aligns with ATT&CK technique T1068, which covers local privilege escalation through the exploitation of system vulnerabilities, and demonstrates the importance of maintaining up-to-date system patches and implementing proper input validation across all system utilities. Additionally, system administrators should consider disabling unnecessary uucp functionality or restricting its use to specific trusted users, as the vulnerability could be mitigated through operational controls even before patching is completed.