CVE-2011-10011 in WeBid
Summary
by MITRE • 08/14/2025
WeBid 1.0.2 contains a remote code injection vulnerability in the converter.php script, where unsanitized input in the to parameter of a POST request is written directly into includes/currencies.php. This allows unauthenticated attackers to inject arbitrary PHP code, resulting in persistent remote code execution when the modified script is accessed or included by the application.
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Analysis
by VulDB Data Team • 08/15/2025
The vulnerability identified as CVE-2011-10011 affects WeBid version 1.0.2 and represents a critical remote code execution flaw that stems from inadequate input validation within the converter.php script. This vulnerability specifically targets the handling of the 'to' parameter in POST requests, where user-supplied data flows directly into the includes/currencies.php file without proper sanitization or escaping mechanisms. The flaw exists at the intersection of insecure data handling and code generation practices, creating a persistent backdoor that can be exploited by unauthenticated attackers to execute arbitrary PHP code on the target system.
The technical implementation of this vulnerability follows a classic path of code injection where the attacker crafts a malicious POST request containing specially formatted input in the 'to' parameter. When the application processes this request, the unsanitized data is written directly to the currencies.php file, which is subsequently included or executed by the application. This creates a persistent threat vector where the injected code remains active even after the initial exploit, as the modified file becomes part of the application's normal execution flow. The vulnerability operates under CWE-94, which classifies it as an "Improper Control of Generation of Code ('Code Injection')" and aligns with ATT&CK technique T1190, "Exploit Public-Facing Application," demonstrating how attackers can leverage web application flaws to achieve remote code execution.
The operational impact of this vulnerability extends beyond simple code injection, as it provides attackers with complete control over the affected system. Once exploited, attackers can execute commands with the privileges of the web server, potentially leading to data theft, system compromise, or further lateral movement within the network. The persistent nature of the vulnerability means that even if the initial exploit is discovered and patched, the injected code continues to execute whenever the modified file is accessed. This makes the vulnerability particularly dangerous for applications that rely on automated processes or regular file access patterns. The lack of authentication requirements for exploitation further amplifies the risk, as any attacker with network access to the vulnerable application can immediately leverage this flaw.
Mitigation strategies for CVE-2011-10011 should focus on immediate input validation and sanitization measures to prevent any user-supplied data from being written directly to executable files. Organizations should implement proper parameter validation, input filtering, and output encoding mechanisms to ensure that user data cannot be interpreted as code. The most effective remediation involves updating to a patched version of WeBid or implementing proper code review processes that prevent direct data injection into configuration or include files. Additionally, network segmentation and web application firewalls can provide additional layers of protection by monitoring and filtering suspicious POST requests. Regular security assessments and vulnerability scanning should be conducted to identify similar patterns of insecure data handling that could lead to comparable vulnerabilities in other applications. The vulnerability serves as a prime example of why secure coding practices must be integrated throughout the development lifecycle, particularly when dealing with dynamic code generation and file manipulation operations that could expose systems to persistent remote code execution threats.