CVE-2017-17111 in Readymade Classifieds Script
Summary
by MITRE
Posty Readymade Classifieds Script 1.0 allows an attacker to inject SQL commands via a listings.php?catid= or ads-details.php?ID= request.
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Analysis
by VulDB Data Team • 10/30/2025
The vulnerability identified as CVE-2017-17111 affects the Posty Readymade Classifieds Script version 1.0, representing a critical SQL injection flaw that exposes the application to unauthorized data access and manipulation. This vulnerability stems from inadequate input validation and sanitization within the script's handling of user-supplied parameters in two specific endpoints: listings.php with the catid parameter and ads-details.php with the ID parameter. The flaw enables attackers to construct malicious SQL queries that bypass normal authentication mechanisms and directly interact with the underlying database system. According to CWE-89, this vulnerability maps directly to SQL injection, a well-documented weakness that allows attackers to execute arbitrary SQL commands and potentially gain complete control over the database server.
The technical implementation of this vulnerability occurs when user input from the catid and ID parameters is directly incorporated into SQL query construction without proper sanitization or parameterization. Attackers can exploit this by crafting malicious payloads that manipulate the SQL execution flow, potentially leading to unauthorized data retrieval, modification, or deletion. The vulnerability's impact extends beyond simple data theft as it can enable attackers to escalate privileges, extract sensitive information such as user credentials, and even compromise the entire application infrastructure. This type of injection vulnerability is particularly dangerous because it can be exploited through standard web browser interactions, making it accessible to attackers with minimal technical expertise.
The operational impact of CVE-2017-17111 is severe and multifaceted, potentially allowing attackers to gain unauthorized access to classified listings data, user accounts, and administrative information stored within the database. An attacker could exploit this vulnerability to retrieve sensitive user data including personal information, contact details, and potentially authentication credentials stored in the database. The vulnerability also poses risks to data integrity and availability, as attackers could modify or delete listings and advertisements within the classifieds system. This type of attack falls under the ATT&CK framework's technique T1071.004 for application layer protocol and T1046 for network service scanning, demonstrating how attackers can leverage SQL injection to gather intelligence and establish persistent access to web applications. The vulnerability's exploitation can lead to complete system compromise and unauthorized access to the classifieds platform's administrative functions.
Mitigation strategies for this vulnerability require immediate implementation of proper input validation and parameterized query construction throughout the application codebase. The most effective approach involves implementing prepared statements or parameterized queries for all database interactions, ensuring that user input is treated as data rather than executable code. Additionally, implementing proper input sanitization, output encoding, and web application firewall rules can significantly reduce the attack surface. Organizations should also conduct comprehensive code reviews to identify similar vulnerabilities in other parameters and endpoints, as this represents a common pattern in legacy web applications. According to industry best practices and NIST guidelines, regular security assessments and vulnerability scanning should be implemented to prevent similar issues in future deployments. The remediation process must include updating the classifieds script to a patched version or implementing proper security controls at the application level to prevent SQL injection attacks from compromising the system's integrity and confidentiality.