CVE-2008-1565 in Pjirc Module
Summary
by MITRE
Directory traversal vulnerability in forum/irc/irc.php in the PJIRC 0.5 module for phpBB allows remote attackers to include and execute arbitrary local files via a .. (dot dot) in the phpEx parameter.
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Analysis
by VulDB Data Team • 09/15/2025
The CVE-2008-1565 vulnerability represents a critical directory traversal flaw within the PJIRC 0.5 module for phpBB, specifically affecting the forum/irc/irc.php component. This vulnerability stems from inadequate input validation mechanisms that fail to properly sanitize user-supplied parameters before processing them within the application's file inclusion logic. The flaw manifests when the phpEx parameter contains directory traversal sequences such as .. (dot dot), enabling malicious actors to manipulate the file inclusion process and access arbitrary local files on the server hosting the vulnerable application. The vulnerability is classified under CWE-22 as a Directory Traversal Attack, which is a well-documented weakness in software applications that fail to properly validate file paths and prevent access to unauthorized resources. The impact of this vulnerability extends beyond simple information disclosure, as it can potentially allow remote code execution when combined with other attack vectors or when the application is configured to execute included files.
The technical exploitation of this vulnerability occurs through manipulation of the phpEx parameter within the irc.php script, where the application fails to validate or sanitize the input before using it in file inclusion operations. Attackers can construct malicious URLs that include directory traversal sequences, effectively bypassing normal file access controls and gaining access to sensitive files such as configuration files, database credentials, or other system resources that should remain protected. This flaw is particularly dangerous because it operates at the file system level, allowing attackers to traverse the directory structure and access files that may contain sensitive information or system configurations. The vulnerability is categorized under ATT&CK technique T1059.007 for Command and Scripting Interpreter: PowerShell, though more accurately it aligns with T1566.001 for Credential Access: Credential Dumping through unauthorized file access, and T1083 for File and Directory Discovery as attackers explore the system's file structure. The exploitation process typically involves crafting a request that includes sequences such as ../../../etc/passwd or similar traversal patterns that enable access to system files that should normally be restricted.
The operational impact of this vulnerability extends beyond simple unauthorized file access, as it can potentially allow attackers to execute arbitrary code on the target system when combined with other vulnerabilities or when the application is configured to process included files as executable content. This makes the vulnerability particularly dangerous in environments where the application is running with elevated privileges or where sensitive system files are accessible through the traversal mechanism. The vulnerability affects phpBB installations that have the PJIRC 0.5 module enabled, which is commonly used for integrating internet relay chat functionality into phpBB forums. Organizations using these vulnerable modules face significant risk of data breaches, system compromise, and potential lateral movement within their network infrastructure, as attackers can leverage this vulnerability to gain access to system configuration files, user credentials, or other sensitive resources that could be used for further attacks. The vulnerability's severity is amplified by the fact that it requires minimal input manipulation and can be exploited by attackers with basic knowledge of web application vulnerabilities.
Mitigation strategies for this vulnerability include immediate patching of the affected phpBB installations with the latest security updates that address the directory traversal flaw in the PJIRC module. System administrators should also implement input validation measures that sanitize all user-supplied parameters before processing them within the application, particularly focusing on path traversal sequences and special characters that could enable directory traversal attacks. The implementation of proper access controls and privilege separation ensures that even if an attacker successfully exploits the vulnerability, they cannot access critical system resources or execute arbitrary code. Network-level protections such as web application firewalls can provide additional defense-in-depth by detecting and blocking malicious requests containing directory traversal sequences. Regular security assessments and vulnerability scanning should be conducted to identify other potential directory traversal vulnerabilities within the application stack, as this class of vulnerability is particularly common in legacy applications and modules that have not been properly updated to address modern security requirements. Organizations should also implement proper logging and monitoring of file access patterns to detect potential exploitation attempts and maintain audit trails for forensic analysis.