CVE-2003-0385 in xaos
Summary
by MITRE
Buffer overflow in xaos 3.0-23 and earlier, when running setuid, allows local users to gain root privileges via a long -language option.
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Analysis
by VulDB Data Team • 11/26/2024
The vulnerability described in CVE-2003-0385 represents a critical buffer overflow flaw within the xaos graphics application version 3.0-23 and earlier. This issue specifically manifests when the application executes with elevated privileges through the setuid bit mechanism, creating a dangerous condition where local users can exploit the software's handling of command-line arguments. The vulnerability is triggered by providing an excessively long -language option parameter, which causes the application to overwrite adjacent memory locations beyond the intended buffer boundaries.
The technical nature of this flaw aligns with CWE-121, which categorizes buffer overflow conditions where insufficient bounds checking allows attackers to overwrite memory regions and potentially execute arbitrary code. The vulnerability exploits the fundamental principle of setuid applications where a program runs with the privileges of its owner rather than the user executing it, typically root for system-level utilities. When xaos processes the malformed -language argument, it fails to properly validate input length before copying data into fixed-size buffers, allowing attackers to overwrite return addresses, function pointers, or other critical memory structures.
The operational impact of this vulnerability extends far beyond simple privilege escalation as it provides attackers with complete control over the system where the vulnerable application resides. Local users who can execute the xaos program can leverage this flaw to elevate their privileges from regular user status to root level access, effectively bypassing all user permission controls and gaining unrestricted access to system resources, files, and processes. This type of local privilege escalation attack directly maps to ATT&CK technique T1068, which describes the exploitation of legitimate credentials and privileges to gain system-level access.
The exploitation process involves crafting a specially formatted command-line argument that exceeds the allocated buffer space, causing memory corruption that can be manipulated to redirect program execution flow. Attackers can potentially overwrite the return address on the stack to point to malicious code or existing system functions that provide shell access. This vulnerability demonstrates the critical importance of input validation in setuid applications, where any flaw in parameter handling can immediately translate into system compromise. The vulnerability is particularly dangerous because it requires no network connectivity or external attack vectors, making it exploitable through local system access alone.
Mitigation strategies for CVE-2003-0385 should focus on immediate software updates to versions that properly handle buffer boundaries and implement input validation for all command-line parameters. System administrators must ensure that the xaos package is updated to a patched version that prevents buffer overflows through proper bounds checking and memory management. Additionally, implementing the principle of least privilege by removing unnecessary setuid bits from applications that do not require elevated privileges can significantly reduce the attack surface. The recommended approach includes disabling setuid functionality for xaos if it is not essential for the application's core functionality, as well as implementing input sanitization measures that validate argument lengths before processing to prevent buffer overflow conditions from occurring in the first place.