CVE-2002-0470 in PHPNetToolpack
Summary
by MITRE
PHPNetToolpack 0.1 relies on its environment s PATH to find and execute the traceroute program, which could allow local users to gain privileges by inserting a Trojan horse program into the search path.
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Analysis
by VulDB Data Team • 06/19/2024
The vulnerability identified as CVE-2002-0470 resides within PHPNetToolpack version 0.1, a network utility package that interfaces with system commands to perform network diagnostics. This particular flaw stems from the software's reliance on the system's PATH environment variable to locate and execute the traceroute program, creating a critical security weakness that can be exploited by local attackers. The issue manifests when the application does not explicitly specify the full path to the traceroute executable, instead trusting the operating system's PATH resolution mechanism to locate the appropriate binary. This design decision opens the door to privilege escalation attacks, as malicious actors can manipulate the execution environment to their advantage.
The technical implementation of this vulnerability aligns with CWE-426, which describes the improper use of a system call that can lead to privilege escalation through command injection or path manipulation. When PHPNetToolpack executes the traceroute command, it leverages the system's PATH variable to determine which traceroute binary to invoke, without implementing proper input validation or explicit path resolution. This behavior creates a race condition vulnerability where an attacker can insert a malicious Trojan horse program into the PATH at a higher precedence location than the legitimate traceroute binary. The attacker's malicious executable, when placed in a directory that appears earlier in the PATH, gets executed instead of the legitimate system traceroute utility, potentially executing arbitrary code with the privileges of the user running PHPNetToolpack.
The operational impact of this vulnerability extends beyond simple privilege escalation to encompass potential system compromise and data exposure. Local users who can manipulate the PATH environment variable or have write access to directories within it can effectively hijack the execution flow of PHPNetToolpack, leading to unauthorized code execution and potential privilege elevation. This vulnerability particularly affects systems where PHPNetToolpack is executed with elevated privileges or where local users have the ability to modify system PATH configurations. The attack vector is relatively straightforward as it requires only that an attacker can place a malicious executable in a directory within the PATH, making this a common target for privilege escalation attacks in Unix-like environments.
Mitigation strategies for this vulnerability should focus on implementing proper command path validation and privilege separation mechanisms. The recommended approach involves explicitly specifying full paths to system utilities rather than relying on PATH resolution, which directly addresses the root cause of the vulnerability. System administrators should ensure that PHPNetToolpack is configured to use absolute paths when invoking traceroute and other system commands, preventing the exploitation of PATH manipulation techniques. Additionally, implementing proper privilege separation by running PHPNetToolpack with minimal required privileges and utilizing sandboxing techniques can significantly reduce the potential impact of such vulnerabilities. The ATT&CK framework categorizes this type of vulnerability under privilege escalation techniques, specifically targeting the PATH hijacking method that allows attackers to execute malicious code with elevated privileges. Organizations should also consider implementing monitoring and alerting mechanisms to detect suspicious PATH modifications or unauthorized executable installations in system directories that could indicate exploitation attempts.