CVE-2002-2236 in apt-www-proxy
Summary
by MITRE
Format string vulnerability in the awp_log function in apt-www-proxy 0.1 allows remote attackers to execute arbitrary code.
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Analysis
by VulDB Data Team • 07/12/2024
The CVE-2002-2236 vulnerability represents a critical format string flaw in the apt-www-proxy software version 0.1, specifically within the awp_log function. This vulnerability arises from improper handling of user-supplied input that is directly incorporated into format string operations without adequate sanitization or validation. The flaw exists in the proxy server's logging mechanism where external inputs are processed through printf-style functions without proper formatting controls, creating an exploitable condition that can be leveraged by remote attackers to execute arbitrary code on the affected system.
The technical implementation of this vulnerability stems from the software's failure to properly validate or escape input data before using it in format string operations. When the awp_log function processes incoming requests or log entries, it accepts user-provided data and directly passes it to format string functions such as printf or sprintf without proper parameter validation. This allows attackers to inject format specifiers into the log messages, which can then be exploited to manipulate the program's execution flow. The vulnerability is particularly dangerous because it enables attackers to perform stack smashing attacks, read arbitrary memory locations, or overwrite critical program variables and function pointers.
From an operational perspective, this vulnerability presents a severe risk to systems running apt-www-proxy 0.1 as it allows remote code execution without requiring authentication. Attackers can exploit this flaw to gain full control over the affected server, potentially leading to complete system compromise, data exfiltration, or use as a pivot point for further attacks within the network. The impact extends beyond immediate system compromise as the vulnerability could be used to establish persistent backdoors or to deploy additional malicious payloads. This makes the vulnerability particularly attractive to threat actors who seek to maintain long-term access to compromised systems while conducting reconnaissance or launching additional attacks.
The vulnerability aligns with CWE-134, which specifically addresses the use of format strings inappropriately, and maps to several ATT&CK techniques including T1059 for command and scripting interpreter and T1078 for valid accounts. Organizations should implement immediate mitigations including applying the vendor-supplied patches or upgrading to versions that address this vulnerability, disabling unnecessary proxy functionality, and implementing network segmentation to limit potential attack surfaces. Additionally, input validation should be strengthened throughout the application to prevent format string injection, and monitoring systems should be enhanced to detect unusual logging patterns that might indicate exploitation attempts. The remediation process should also include reviewing other functions within the application for similar format string vulnerabilities to prevent future incidents.
The broader implications of this vulnerability highlight the importance of secure coding practices and proper input validation in network services. It demonstrates how seemingly benign logging functionality can become a critical security weakness when proper security measures are not implemented. Organizations should conduct comprehensive security assessments of their proxy and caching systems, implement robust input sanitization mechanisms, and establish secure coding standards that prevent format string vulnerabilities from being introduced into software development processes. Regular security testing and vulnerability scanning should be integrated into the software development lifecycle to identify and remediate such issues before they can be exploited in production environments.