CVE-2006-2012 in Skulltag
Summary
by MITRE
Format string vulnerability in Skulltag 0.96f and earlier allows remote attackers to cause a denial of service via the version string.
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Analysis
by VulDB Data Team • 07/25/2018
The vulnerability identified as CVE-2006-2012 represents a format string vulnerability within Skulltag version 0.96f and earlier versions, constituting a critical security flaw that affects the game's network communication protocols. This vulnerability resides in the handling of version strings during client-server interactions, where the application fails to properly validate or sanitize input data before processing it through format string functions. The flaw specifically manifests when the game engine encounters malformed version information transmitted over the network, creating an exploitable condition that can be leveraged by remote attackers to disrupt normal operations.
The technical implementation of this vulnerability stems from improper input validation mechanisms within Skulltag's network protocol handler, where version strings are processed without adequate sanitization measures. When a malicious actor sends a specially crafted version string containing format specifiers such as %s, %d, or %x, the application's printf-like functions interpret these characters as format directives rather than literal text. This misinterpretation occurs because the software directly uses user-supplied version data in format string operations without first escaping or validating the input against known dangerous patterns. The vulnerability aligns with CWE-134, which specifically addresses the use of format strings with user-supplied data, making it a classic example of insecure coding practices that enable arbitrary code execution or system instability.
The operational impact of this vulnerability extends beyond simple denial of service conditions, as it fundamentally compromises the integrity of the game's network communication infrastructure. Remote attackers can exploit this weakness to crash the game server or client applications, effectively disrupting multiplayer gaming sessions and potentially causing complete service outages. The vulnerability's remote nature means that attackers do not require physical access to the system or local network privileges to exploit it, making it particularly dangerous in public gaming environments where multiple players connect to shared servers. This type of attack can be executed through various network-based methods including direct packet injection or by manipulating game client connections, providing attackers with multiple vectors for exploitation.
Security professionals should recognize this vulnerability as a prime example of how insufficient input validation can lead to severe operational disruptions in networked applications. The flaw demonstrates the importance of implementing robust input sanitization procedures and following secure coding practices that prevent format string vulnerabilities from being introduced into software systems. Organizations should prioritize immediate patching of affected Skulltag installations and implement network monitoring solutions to detect potential exploitation attempts. The vulnerability also highlights the need for regular security assessments of legacy gaming software, as many older applications remain in use despite known security flaws. From an ATT&CK framework perspective, this vulnerability maps to the T1190 technique related to Exploit Public-Facing Application, emphasizing the critical importance of maintaining up-to-date security patches and implementing proper network segmentation to limit the impact of such exploits on broader network infrastructure.