CVE-2011-5091 in grboard
Summary
by MITRE
Multiple SQL injection vulnerabilities in GR Board (aka grboard) 1.8.6.5 Community Edition allow remote attackers to execute arbitrary SQL commands via the (1) tableType or (2) blindTarget parameter to view.php, (3) the delTargets[0] parameter to view_memo.php, or (4) the isReported parameter to write_ok.php.
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Analysis
by VulDB Data Team • 02/17/2019
The vulnerability identified as CVE-2011-5091 represents a critical security flaw in GR Board version 1.8.6.5 Community Edition, a web-based bulletin board system that was widely used for online forums and community discussions. This vulnerability manifests as multiple SQL injection flaws that collectively expose the application to remote code execution attacks, potentially allowing malicious actors to gain unauthorized access to sensitive data and system resources. The affected software operates within a typical web application environment where user inputs are processed through various PHP scripts to interact with underlying database systems, creating multiple attack vectors that adversaries can exploit to manipulate database queries.
The technical exploitation of this vulnerability occurs through four distinct parameter injection points within the application's codebase. The primary attack vectors include the tableType and blindTarget parameters in the view.php script, which when manipulated can alter the SQL query structure to execute arbitrary database commands. Additionally, the delTargets[0] parameter in view_memo.php and the isReported parameter in write_ok.php provide further opportunities for attackers to inject malicious SQL code. These injection points directly correlate to CWE-89, which defines SQL injection as the insertion of malicious SQL code into input fields for execution by the database engine. The vulnerability essentially allows attackers to bypass normal input validation mechanisms and directly manipulate the database query execution flow.
The operational impact of CVE-2011-5091 extends beyond simple data theft, as successful exploitation could enable attackers to perform complete database compromise including data modification, deletion, or unauthorized access to administrative functions. This vulnerability particularly affects organizations relying on community forum platforms where user-generated content is processed through the vulnerable scripts, potentially exposing user credentials, private messages, and other sensitive information stored within the database. The remote nature of the attack means that adversaries need only access to the web application to exploit these vulnerabilities, making them particularly dangerous for publicly accessible systems. Attackers could leverage these flaws to escalate privileges, establish persistent access, or conduct further reconnaissance against the underlying infrastructure.
Mitigation strategies for this vulnerability require immediate implementation of input validation and parameter sanitization measures across all affected PHP scripts. Organizations should implement proper prepared statements or parameterized queries to prevent SQL injection attacks, as recommended by the OWASP Top Ten project and the ATT&CK framework's methodology for preventing command injection vulnerabilities. The most effective approach involves filtering all user inputs through strict validation routines and implementing proper output encoding to prevent malicious code execution. Additionally, regular security audits and vulnerability assessments should be conducted to identify similar flaws in other components of the application stack. System administrators should also consider implementing web application firewalls and intrusion detection systems to monitor for suspicious database query patterns that might indicate exploitation attempts. The vulnerability demonstrates the critical importance of proper input validation in web applications and serves as a reminder of the potential consequences when security measures are insufficiently implemented in database interaction components.