CVE-2004-0089 in Mac OS X
Summary
by MITRE
Buffer overflow in TruBlueEnvironment in Mac OS X 10.3.x and 10.2.x allows local users to gain privileges via a long environment variable.
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Analysis
by VulDB Data Team • 12/15/2024
The vulnerability identified as CVE-2004-0089 represents a critical buffer overflow flaw within the TruBlueEnvironment component of Mac OS X versions 10.2.x and 10.3.x. This issue manifests as a classic stack-based buffer overflow that occurs when processing environment variables, specifically affecting the system's ability to handle excessively long input parameters. The vulnerability resides in the way the system processes environment variables during application execution, creating an opportunity for malicious manipulation of memory layout.
The technical exploitation of this vulnerability leverages the fundamental flaw in input validation mechanisms within the TruBlueEnvironment subsystem. When a local user provides an environment variable exceeding the allocated buffer size, the system fails to properly terminate or validate the input, allowing subsequent memory writes to overwrite adjacent memory locations. This overflow can potentially overwrite critical program execution data including return addresses, function pointers, or other control structures that govern program flow. The vulnerability is particularly dangerous because it operates within the context of a local user account, yet can be exploited to escalate privileges to the root level, making it a significant concern for system security.
From an operational perspective, this vulnerability presents a substantial risk to Mac OS X systems running the affected versions as it allows privilege escalation without requiring network access or specialized attack vectors. The local nature of the exploit means that any user with access to the system can potentially leverage this flaw to gain administrative privileges, fundamentally compromising system integrity and confidentiality. The impact extends beyond simple privilege escalation to potentially enable full system compromise, as the attacker can execute arbitrary code with elevated privileges. This vulnerability aligns with CWE-121, which categorizes stack-based buffer overflow conditions, and demonstrates how improper input handling can lead to critical security breaches.
The exploitation of this vulnerability follows established attack patterns documented in the MITRE ATT&CK framework, particularly relating to privilege escalation techniques within the operating system. Attackers can craft malicious environment variables that, when processed by the vulnerable TruBlueEnvironment component, trigger the buffer overflow and subsequently execute malicious code with elevated privileges. The vulnerability affects systems where the TruBlueEnvironment component is actively utilized, typically in contexts where environment variables are processed during application startup or execution. Organizations should consider implementing immediate mitigations including system updates, environment variable length restrictions, and monitoring for unusual process behavior that may indicate exploitation attempts.
The root cause of this vulnerability stems from inadequate bounds checking and input validation within the system's environment variable processing logic. This flaw represents a common category of software security issues that can be prevented through proper defensive programming practices including buffer size validation, use of safe string handling functions, and comprehensive input sanitization. System administrators should prioritize patching affected systems and consider implementing additional security controls such as mandatory access controls and process monitoring to detect potential exploitation attempts. The vulnerability also highlights the importance of regular security assessments and vulnerability management programs to identify and remediate similar issues before they can be exploited by malicious actors.