CVE-2015-3172 in EidoGo
Summary
by MITRE • 07/07/2022
EidoGo is susceptible to Cross-Site Scripting (XSS) attacks via maliciously crafted SGF input.
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Analysis
by VulDB Data Team • 07/20/2022
The vulnerability identified as CVE-2015-3172 affects EidoGo, a web-based Go game application that processes SGF (Smart Game Format) files for game data representation. This security flaw represents a classic cross-site scripting vulnerability that allows attackers to inject malicious scripts into web pages viewed by other users. The vulnerability specifically manifests when the application processes SGF input without proper sanitization or encoding of user-supplied data, creating an avenue for persistent XSS attacks that can compromise user sessions and execute unauthorized actions within the victim's browser context.
The technical implementation of this vulnerability stems from inadequate input validation and output encoding mechanisms within the EidoGo application's SGF processing functionality. When users upload or interact with SGF files containing malicious script code, the application fails to properly escape or sanitize special characters that could be interpreted as HTML or JavaScript commands. This allows attackers to embed malicious payloads within SGF files that are then rendered in the web interface, executing in the context of other users' browsers. The vulnerability falls under CWE-79 which specifically addresses Cross-Site Scripting flaws, and aligns with ATT&CK technique T1566.001 for initial access through malicious file downloads.
The operational impact of this vulnerability extends beyond simple script execution, as it can enable attackers to steal user session cookies, perform actions on behalf of authenticated users, and potentially gain access to sensitive game data or user information. An attacker could craft an SGF file containing malicious JavaScript that, when viewed by another user, would execute in their browser and could redirect them to phishing sites, steal authentication tokens, or manipulate game state. The persistent nature of this vulnerability means that once a malicious SGF file is processed and stored, it continues to pose a threat to all users who encounter it. This represents a significant risk for collaborative gaming environments where users frequently share game files and could lead to unauthorized access to user accounts and potential data breaches.
Mitigation strategies for this vulnerability should focus on implementing comprehensive input validation and output encoding mechanisms throughout the application's SGF processing pipeline. The recommended approach includes sanitizing all user-supplied SGF data by removing or encoding potentially dangerous characters, implementing proper HTML escaping for all dynamic content, and utilizing Content Security Policy headers to limit script execution. Additionally, the application should employ strict input validation to reject SGF files containing known malicious patterns and implement proper error handling that does not expose internal system information. Security patches should ensure that all SGF data is properly encoded before being rendered in web pages, and regular security testing should be conducted to verify that the implemented protections remain effective against evolving attack vectors. Organizations should also consider implementing web application firewalls and monitoring systems to detect and prevent exploitation attempts targeting this vulnerability.