CVE-2017-7891 in sourcebans-pp
Summary
by MITRE
sourcebans-pp (SourceBans++) 1.5.4.7 has XSS in admin.comms.php via the rebanid parameter.
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Analysis
by VulDB Data Team • 11/29/2022
The vulnerability identified as CVE-2017-7891 affects SourceBans++, a popular web-based administration tool for Source engine games such as Counter-Strike and Team Fortress 2. This particular flaw exists within the admin.comms.php script of version 1.5.4.7, making it susceptible to cross-site scripting attacks that could potentially compromise the security of administrators using the platform. The vulnerability specifically manifests through the rebanid parameter, which is processed without proper input validation or output encoding, creating an avenue for malicious actors to inject and execute arbitrary JavaScript code within the context of an administrator's browser session.
The technical nature of this vulnerability aligns with CWE-79, which categorizes cross-site scripting flaws as weaknesses in web applications that allow attackers to inject client-side scripts into web pages viewed by other users. In this case, the rebanid parameter serves as the injection vector where unfiltered user input is directly incorporated into the page's output without appropriate sanitization or encoding measures. When an administrator visits a page containing malicious content passed through this parameter, the injected JavaScript executes within their browser with the privileges of their session, potentially enabling full administrative control over the SourceBans++ system.
The operational impact of this vulnerability extends beyond simple data theft or session hijacking, as it provides attackers with the capability to escalate their privileges within the SourceBans++ environment. Since the tool is designed for server administration and communication management, successful exploitation could allow attackers to manipulate bans, modify player communications, access sensitive administrative functions, or even gain access to underlying server configurations. This represents a significant risk to game server administrators who rely on SourceBans++ for maintaining order and security within their communities, as the attack requires minimal technical skill to execute and can be automated through various means.
Mitigation strategies for this vulnerability should prioritize immediate patching of the affected SourceBans++ version to the latest stable release that addresses the XSS flaw. Additionally, administrators should implement proper input validation and output encoding practices throughout the application, particularly for all parameters that accept user-supplied data. The implementation of content security policies and proper parameter sanitization techniques would help prevent similar vulnerabilities from manifesting in other areas of the application. Security monitoring should also be enhanced to detect suspicious parameter values being passed through the application, and regular security audits should be conducted to identify potential injection points that may require similar remediation efforts. This vulnerability demonstrates the critical importance of input validation in web applications and aligns with ATT&CK technique T1213, which covers data from information repositories, particularly in the context of web application security flaws that enable unauthorized access to administrative functions.