CVE-2003-0834 in Solaris
Summary
by MITRE
Buffer overflow in CDE libDtHelp library allows local users to execute arbitrary code via (1) a modified DTHELPUSERSEARCHPATH environment variable and the Help feature, (2) DTSEARCHPATH, or (3) LOGNAME.
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Analysis
by VulDB Data Team • 07/20/2025
The vulnerability described in CVE-2003-0834 represents a critical buffer overflow flaw within the Common Desktop Environment CDE libDtHelp library, which forms part of the Unix-based desktop computing framework. This security weakness exists in the way the library processes environment variables and user input within the Help feature functionality, creating opportunities for malicious exploitation that can lead to arbitrary code execution on affected systems. The vulnerability specifically targets the CDE environment, which was widely used in enterprise computing environments during the early 2000s, making this issue particularly significant for organizations running legacy Unix systems.
The technical implementation of this buffer overflow occurs when the libDtHelp library fails to properly validate the length of strings provided through specific environment variables. Attackers can exploit this weakness by crafting malicious input through three distinct vectors: DTHELPUSERSEARCHPATH, DTSEARCHPATH, and LOGNAME environment variables. When these variables contain overly long strings that exceed the allocated buffer space, the library's memory management routines fail, causing stack corruption that can be leveraged to overwrite critical memory locations including return addresses and function pointers. This type of vulnerability falls under CWE-121, which specifically addresses stack-based buffer overflow conditions where insufficient bounds checking allows attackers to overwrite adjacent memory locations.
The operational impact of this vulnerability extends beyond simple privilege escalation, as local users who can manipulate these environment variables can effectively gain complete control over the affected system. The exploitation process typically involves carefully crafted input that causes the buffer overflow to redirect program execution flow to malicious code placed in the stack. This represents a classic attack pattern that aligns with ATT&CK technique T1059.001 for command and scripting interpreter, as attackers can execute arbitrary code within the context of the Help application. The vulnerability is particularly dangerous in multi-user environments where local users might have limited access but can still influence the execution environment through these variable manipulations.
Organizations affected by this vulnerability should implement immediate mitigations including patching the CDE libraries to address the buffer overflow conditions, implementing proper environment variable validation, and restricting user access to modify critical environment variables. System administrators should also consider implementing monitoring for unusual environment variable modifications and establish privilege separation mechanisms to limit the potential impact of such attacks. The vulnerability demonstrates the importance of proper input validation and memory management practices, as outlined in security standards such as the OWASP Top Ten and NIST SP 800-160 guidelines for secure coding practices. Additionally, organizations should conduct comprehensive vulnerability assessments to identify other potentially vulnerable components within their CDE environments and ensure that legacy systems are properly maintained or migrated to more secure modern alternatives.