CVE-2004-2231 in Mlink
Summary
by MITRE
Zero G Software InstallAnywhere 5.0.6, 5.0.7, and earlier allows local users to overwrite arbitrary files via a symlink attack on the (1) persistent_state or (2) env.properties.X temporary files.
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Analysis
by VulDB Data Team • 07/17/2017
The vulnerability identified as CVE-2004-2231 affects Zero G Software InstallAnywhere versions 5.0.6 and earlier, representing a critical file system security flaw that enables local attackers to manipulate system files through symbolic link attacks. This issue manifests when the software creates temporary files during its operation, specifically targeting the persistent_state and env.properties.X files that are susceptible to symlink manipulation. The vulnerability stems from insufficient validation of temporary file creation processes, allowing malicious users to establish symbolic links that redirect file operations to arbitrary locations on the system. The attack vector exploits the predictable naming conventions of temporary files combined with inadequate permission checking mechanisms, creating an environment where local users can overwrite critical system files or inject malicious content into the installation process.
This vulnerability operates under the broader category of insecure temporary file handling as classified by CWE-377, specifically relating to CWE-378 which addresses the creation of temporary files with insecure permissions. The flaw represents a privilege escalation opportunity where local users can leverage their existing system access to gain elevated privileges or compromise system integrity. The technical implementation involves the software's failure to properly validate the existence and ownership of temporary files before writing to them, creating a race condition scenario where symbolic links can be inserted between the file existence check and the actual write operation. Attackers can exploit this by creating symbolic links with the same names as the temporary files, causing the installation process to write data to unintended locations rather than the intended temporary file locations.
The operational impact of this vulnerability extends beyond simple file overwrites, as it can enable attackers to modify critical system components or configuration files that influence the behavior of the InstallAnywhere application itself. This creates potential for persistent backdoors, privilege escalation, or complete system compromise depending on the target files that are overwritten. The vulnerability affects all local users of the affected software versions, making it particularly dangerous in multi-user environments where untrusted users might have access to the system. Additionally, since the attack requires only local access, it can be executed without network exposure, making it difficult to detect through traditional network monitoring approaches. The temporal nature of the vulnerability means it is most exploitable during the installation or update processes when the software creates these temporary files.
Mitigation strategies for CVE-2004-2231 should focus on immediate software updates to versions that address the temporary file handling vulnerabilities, as well as implementing proper file system permissions and access controls. System administrators should consider running the InstallAnywhere application with minimal required privileges and ensure that temporary file directories have appropriate permissions to prevent unauthorized symbolic link creation. The implementation of secure temporary file creation practices, including using unique naming conventions and proper file descriptor management, should be enforced. Organizations should also conduct regular security audits of installed software to identify and remediate similar vulnerabilities in legacy applications. This vulnerability aligns with ATT&CK technique T1059 which covers command and scripting interpreter usage, as attackers might leverage this vulnerability to execute malicious code through compromised installation processes. Additionally, the vulnerability demonstrates characteristics of T1548.001 which involves abuse of system permissions, as local users can exploit this flaw to gain elevated privileges or compromise system integrity through file system manipulation.