CVE-2003-0088 in Mac OS X
Summary
by MITRE
TruBlueEnvironment for MacOS 10.2.3 and earlier allows local users to overwrite or create arbitrary files and gain root privileges by setting a certain environment variable that is used to write debugging information.
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Analysis
by VulDB Data Team • 07/15/2024
The vulnerability described in CVE-2003-0088 represents a critical privilege escalation flaw within TruBlueEnvironment software running on MacOS 10.2.3 and earlier versions. This issue stems from improper handling of environment variables that are intended for debugging purposes, creating a pathway for local attackers to manipulate system behavior through crafted environmental conditions. The vulnerability specifically targets the debugging functionality of the application, which was designed to write diagnostic information to files on the system.
The technical flaw manifests when the application processes environment variables without adequate validation or sanitization, allowing attackers to inject malicious values that control file creation or modification operations. When certain environment variables are set by a local user, the application executes operations that result in arbitrary file creation or overwriting, with the potential to modify system-critical files. This improper environment variable handling creates a direct attack vector that bypasses normal access controls and privilege boundaries.
The operational impact of this vulnerability is severe as it enables local users to escalate their privileges from standard user level to root access. This privilege escalation occurs because the vulnerable application, when executed with elevated privileges or in a context where it can modify system files, allows the attacker to manipulate file operations through the environment variable manipulation. The ability to create or overwrite arbitrary files with root privileges effectively compromises the entire system integrity and can lead to complete system takeover.
This vulnerability aligns with CWE-276, which addresses improper privileges, and represents a classic example of insecure environment variable handling that can lead to privilege escalation attacks. The attack pattern follows principles outlined in the ATT&CK framework under privilege escalation techniques, specifically targeting the use of environment variables to manipulate program execution. The vulnerability demonstrates how debugging features, when not properly secured, can become attack vectors that undermine system security.
Mitigation strategies for this vulnerability should include immediate patching of the TruBlueEnvironment software to version 10.2.4 or later, which addresses the environment variable handling issue. System administrators should also implement proper environment variable sanitization practices and restrict the ability of untrusted users to set critical environment variables. Additionally, monitoring for unusual file creation patterns and implementing privilege separation measures can help detect and prevent exploitation attempts. The fundamental fix requires the application to validate and sanitize all environment variables before processing them, ensuring that attacker-controlled inputs cannot influence file operations that require elevated privileges.