CVE-1999-0388 in suGuard
Summary
by MITRE
DataLynx suGuard trusts the PATH environment variable to execute the ps command, allowing local users to execute commands as root.
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Analysis
by VulDB Data Team • 09/21/2024
The vulnerability described in CVE-1999-0388 resides within the DataLynx suGuard security application, which was designed to provide enhanced system security controls. This particular flaw represents a classic privilege escalation vulnerability that exploits the trust relationship between the application and the system environment variables. The vulnerability specifically targets how suGuard handles the PATH environment variable during command execution, creating an exploitable condition that allows local attackers to gain elevated privileges. The issue stems from the application's improper handling of environment variables, where it relies on the PATH variable without sufficient validation or sanitization measures.
The technical flaw manifests when suGuard executes the ps command by relying on the PATH environment variable to locate the executable. This approach creates a path traversal vulnerability where an attacker can manipulate the PATH variable to point to a maliciously crafted ps binary located in a directory that appears earlier in the PATH than the legitimate system ps command. When suGuard executes the ps command, it inadvertently runs the attacker-controlled binary instead of the system ps utility, enabling arbitrary command execution with the privileges of the process running suGuard. This vulnerability directly maps to CWE-427 Uncontrolled Search Path Element, which describes situations where applications use environment variables in a manner that allows attackers to influence which executable is run. The flaw represents a fundamental security oversight in input validation and execution context management.
The operational impact of this vulnerability is significant as it allows local users to escalate their privileges to root level access without requiring authentication or specialized tools. Attackers can leverage this weakness to execute arbitrary commands with system-level privileges, potentially leading to complete system compromise. The vulnerability affects systems running DataLynx suGuard where local users have access to the system, making it particularly dangerous in multi-user environments where privilege separation is crucial. This type of vulnerability can be exploited through various attack vectors including shell script manipulation, environment variable modification, or by placing malicious binaries in strategic locations within the PATH. The attack pattern aligns with ATT&CK technique T1068, which covers Local Privilege Escalation through environment variable manipulation.
Mitigation strategies for this vulnerability should focus on implementing proper input validation and environment variable handling within the suGuard application. System administrators should ensure that the PATH environment variable is properly sanitized and that applications do not rely on untrusted PATH elements for command execution. The recommended approach involves using absolute paths for critical system commands rather than relying on PATH resolution, which prevents attackers from substituting executables. Additionally, implementing proper privilege separation and using mechanisms such as setuid restrictions can help limit the potential damage from such vulnerabilities. Organizations should also conduct regular security audits of their applications to identify similar path traversal issues and ensure that environment variables are properly validated before use. The vulnerability demonstrates the critical importance of secure coding practices and proper environment variable handling in security-sensitive applications, emphasizing the need for defense-in-depth strategies that include both application-level fixes and system-level security controls.