CVE-2008-6559 in UnixWare
Summary
by MITRE
Merge mcd in ReliantHA 1.1.4 in SCO UnixWare 7.1.4 allows local users to gain root privileges via a crafted -d argument that contains .. (dot dot) sequences that point to a directory containing a file whose name includes shell metacharacters.
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Analysis
by VulDB Data Team • 10/20/2024
The vulnerability described in CVE-2008-6559 represents a classic path traversal issue within the Merge mcd component of ReliantHA version 1.1.4 running on SCO UnixWare 7.1.4 operating system. This flaw exists in the handling of command line arguments, specifically the -d parameter which is designed to specify directories for merging operations. The vulnerability arises from insufficient input validation and sanitization of user-supplied directory paths, creating a scenario where maliciously crafted input can manipulate the system's file resolution mechanism. The flaw is particularly dangerous because it allows local users to escalate their privileges from standard user level to root access, making it a critical security concern for systems running this specific version of the software.
The technical implementation of this vulnerability stems from the improper handling of directory traversal sequences within the merge mcd utility. When a user provides a crafted -d argument containing .. (dot dot) sequences, the system fails to properly canonicalize or validate these paths before processing them. This allows an attacker to navigate beyond the intended directory boundaries and access files or directories that should otherwise be restricted. The vulnerability becomes exploitable when the specified directory contains files whose names include shell metacharacters such as ampersands, semicolons, or backticks. These metacharacters, when processed by the shell, can execute arbitrary commands with elevated privileges, effectively bypassing normal access controls and privilege boundaries.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it represents a fundamental breakdown in the system's security model. Local users who can execute the merge mcd utility can leverage this flaw to gain root access without requiring any special authentication mechanisms or prior exploitation steps. This makes the vulnerability particularly dangerous in multi-user environments where users may have legitimate access to the system but should not possess administrative privileges. The attack vector is relatively simple to execute, requiring only the ability to run the merge mcd utility with crafted arguments, which could potentially be achieved through various means including social engineering or by exploiting other vulnerabilities that provide local execution capabilities. The vulnerability also demonstrates poor input validation practices and inadequate path resolution mechanisms that violate fundamental security principles.
Mitigation strategies for CVE-2008-6559 should focus on both immediate remediation and long-term architectural improvements. The most direct solution involves patching the affected ReliantHA software to properly validate and sanitize all user-supplied directory paths, implementing strict canonicalization checks that prevent traversal beyond intended boundaries. System administrators should also consider implementing mandatory access controls and privilege separation mechanisms to limit the potential impact of such vulnerabilities. Additionally, the use of secure coding practices including input validation, proper path handling, and privilege escalation controls should be enforced throughout the system architecture. This vulnerability aligns with CWE-22 Path Traversal and CWE-78 Improper Neutralization of Special Elements used in a Command, and corresponds to ATT&CK techniques involving privilege escalation through command injection and path traversal attacks. Organizations should also implement monitoring and logging mechanisms to detect suspicious usage patterns of the merge mcd utility, as well as conduct regular security assessments to identify similar vulnerabilities in other system components that may be susceptible to similar exploitation patterns.