CVE-2015-8326 in IPTables-Parse Module
Summary
by MITRE
The IPTables-Parse module before 1.6 for Perl allows local users to write to arbitrary files owned by the current user.
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Analysis
by VulDB Data Team • 11/11/2024
The CVE-2015-8326 vulnerability affects the IPTables-Parse module version 1.6 and earlier in Perl, presenting a significant local privilege escalation risk through improper file handling mechanisms. This flaw enables malicious local users to write to arbitrary files that are owned by the current user, potentially allowing them to manipulate system configurations or inject malicious content into critical network filtering rules. The vulnerability stems from inadequate validation of file paths and permissions within the module's file manipulation functions, creating a path traversal scenario where user-controlled input can influence the target file location.
The technical implementation of this vulnerability involves the module's failure to properly sanitize file paths during parsing operations of iptables rules. When the IPTables-Parse module processes network firewall configurations, it may inadvertently accept user-supplied input that specifies file destinations, allowing attackers to redirect file write operations to locations they control. This issue directly relates to CWE-22, which describes path traversal vulnerabilities, and CWE-73, which addresses external control of file name or path. The module's lack of proper input validation and secure file handling practices creates an attack surface where local users can exploit the parsing logic to gain unauthorized write access to files within the user's permissions scope.
The operational impact of this vulnerability extends beyond simple file manipulation, as it can be leveraged to compromise the integrity of network security configurations. Attackers could potentially modify iptables rule files to redirect traffic, disable security measures, or create backdoor access points within the network filtering infrastructure. This risk is particularly concerning in environments where the IPTables-Parse module is used with elevated privileges or in automated security management systems. The vulnerability aligns with ATT&CK technique T1059.007, which covers scripting through command-line interpreters, and T1548.002, focusing on abuse of group privileges, as local users might exploit this to gain unauthorized access to system resources through compromised configuration files.
Mitigation strategies for CVE-2015-8326 should prioritize immediate patching of the IPTables-Parse module to version 1.6 or later, where the vulnerability has been addressed through proper input validation and secure file handling mechanisms. System administrators should implement strict file permission controls and audit access to iptables configuration files to detect unauthorized modifications. Additional protective measures include restricting the execution privileges of the module, implementing file integrity monitoring systems, and conducting regular security assessments of Perl-based network management tools. Organizations should also consider implementing principle of least privilege for users who interact with network security configuration modules and establish monitoring procedures to detect anomalous file write operations that could indicate exploitation attempts.