CVE-2002-0213 in K-AShare
Summary
by MITRE
xkas in Xinet K-AShare 0.011.01 for IRIX allows local users to read arbitrary files via a symlink attack on the VOLICON file, which is copied to the .HSicon file in a shared directory.
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Analysis
by VulDB Data Team • 06/06/2018
The vulnerability identified as CVE-2002-0213 affects Xinet K-AShare version 0.011.01 running on IRIX operating systems, presenting a significant security risk through improper file handling mechanisms. This flaw specifically targets the xkas component within the K-AShare application, which is designed to manage shared file access in networked environments. The vulnerability arises from insufficient validation of symbolic link references during file operations, creating an exploitable condition that allows local attackers to bypass normal access controls and retrieve unauthorized data from the system.
The technical implementation of this vulnerability stems from the application's failure to properly handle symbolic link attacks on the VOLICON file during the file copying process. When the xkas component processes shared directory operations, it creates a .HSicon file by copying the VOLICON file without adequate verification of the source file's nature. This process creates a race condition where a local attacker can manipulate the symbolic link structure to redirect the copy operation to target files outside the intended shared directory scope. The flaw directly relates to CWE-59, which describes improper handling of symbolic links, and represents a classic case of insecure file handling that enables privilege escalation through unauthorized file access.
The operational impact of this vulnerability extends beyond simple information disclosure, as it provides attackers with the ability to read arbitrary files from the system's filesystem. This capability allows adversaries to access sensitive configuration files, user data, and potentially system-critical information that should remain protected within the shared directory structure. The vulnerability is particularly dangerous in multi-user environments where shared directories are commonly used for collaboration, as it enables local users to escalate their privileges and access files belonging to other users or system processes. Attackers can exploit this weakness to gather credentials, system configurations, or other confidential information that could facilitate further attacks.
Mitigation strategies for this vulnerability require immediate implementation of proper file validation mechanisms and secure file handling practices. System administrators should ensure that all symbolic link references are properly verified before file operations are performed, implementing checks that prevent the exploitation of race conditions in file copying processes. The recommended approach involves modifying the xkas component to validate file paths and reject symbolic link references during critical file operations. Additionally, organizations should consider implementing mandatory access controls and privilege separation mechanisms that limit the ability of local users to manipulate shared directory structures. This vulnerability aligns with ATT&CK technique T1005 which describes data from local system, and T1059 which covers command and scripting interpreter, as attackers may use this vulnerability to gather information and potentially escalate privileges within the compromised environment.