CVE-2003-1430 in Unreal Engine
Summary
by MITRE
Directory traversal vulnerability in Unreal Tournament Server 436 and earlier allows remote attackers to access known files via a ".." (dot dot) in an unreal:// URL.
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Analysis
by VulDB Data Team • 12/22/2024
The CVE-2003-1430 vulnerability represents a classic directory traversal flaw that affected Unreal Tournament Server versions 436 and earlier, demonstrating how gaming servers could be exploited through malformed URL schemes. This vulnerability specifically targeted the unreal:// protocol handler used by the Unreal Tournament game server software, allowing remote attackers to manipulate file access paths through the use of double dot sequences. The flaw emerged from inadequate input validation within the server's URL parsing mechanism, which failed to properly sanitize or restrict directory navigation sequences that could be embedded within the unreal:// protocol URLs.
The technical exploitation of this vulnerability occurs when an attacker crafts a malicious unreal:// URL containing directory traversal sequences such as ".." that bypass normal file access controls. When the Unreal Tournament Server processes these malformed URLs, it interprets the traversal sequences and grants access to files that should otherwise be protected or restricted. This represents a fundamental failure in input validation and path resolution logic, where the server fails to implement proper boundary checking or canonicalization of file paths before attempting to access them. The vulnerability directly maps to CWE-22, which describes improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal attacks.
The operational impact of this vulnerability extends beyond simple information disclosure, as it could potentially allow attackers to access sensitive server files including configuration data, user credentials, or even system-level files that could facilitate further exploitation. Attackers could leverage this weakness to gain unauthorized access to server resources, potentially leading to complete server compromise or denial of service conditions. The vulnerability's remote nature means that attackers do not require local system access or credentials to exploit it, making it particularly dangerous in networked gaming environments where servers are accessible to the public. This type of attack falls under the ATT&CK technique T1083, which covers file and directory discovery, and could serve as a precursor to more sophisticated attacks involving privilege escalation or lateral movement within affected networks.
Mitigation strategies for this vulnerability include implementing proper input validation and sanitization of all URL parameters, particularly those containing path information. Server administrators should apply the latest security patches provided by Epic Games, as this vulnerability was addressed in subsequent versions of the Unreal Tournament Server software. Network-level protections such as firewall rules that restrict access to specific ports and protocols can help limit the attack surface, while implementing proper access controls and file system permissions can prevent unauthorized file access even if the traversal exploit is successful. Additionally, organizations should consider implementing web application firewalls or security monitoring solutions that can detect and block suspicious URL patterns containing directory traversal sequences. The vulnerability serves as a reminder of the importance of proper input validation in all network services and highlights how seemingly benign protocol handlers can become attack vectors when proper security controls are not implemented.