CVE-2001-0197 in Icecast
Summary
by MITRE
Format string vulnerability in print_client in icecast 1.3.8beta2 and earlier allows remote attackers to execute arbitrary commands.
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Analysis
by VulDB Data Team • 10/08/2025
The vulnerability identified as CVE-2001-0197 represents a critical format string flaw within the icecast streaming media server version 1.3.8beta2 and earlier releases. This vulnerability exists within the print_client function which handles client connection logging and reporting. The issue arises from improper input validation and sanitization of user-supplied data that gets directly incorporated into format string operations without proper escaping or validation. When remote attackers craft malicious input containing format specifiers such as %s, %d, or %x, the application fails to properly handle these characters, leading to potential exploitation. The vulnerability is classified under CWE-134 which specifically addresses the use of format strings with user-supplied data, making it a direct descendant of the well-known format string vulnerability pattern that has plagued numerous software systems over the years. This weakness falls squarely within the attack pattern category of CWE-119 which encompasses issues related to improper restriction of operations within a sphere of control, as the application fails to properly restrict the execution flow when processing user input. The implications of this vulnerability extend beyond simple information disclosure, as it provides attackers with the capability to execute arbitrary code on the affected system. The operational impact is severe given that icecast servers are commonly deployed in production environments where they handle sensitive streaming data and may be accessible from untrusted networks. Attackers can exploit this vulnerability by sending specially crafted requests to the server that contain malicious format specifiers, potentially leading to stack-based buffer overflows, memory corruption, or direct command execution. The attack vector is particularly dangerous because it allows remote code execution without requiring authentication, making it an attractive target for malicious actors seeking to compromise streaming server infrastructure. This vulnerability aligns with the MITRE ATT&CK framework under the technique T1059.007 which covers command and script injection, specifically targeting remote code execution through format string vulnerabilities. The security implications are compounded by the fact that icecast servers often run with elevated privileges to handle media streaming operations, potentially allowing attackers to gain system-level access. The vulnerability also represents a classic example of improper input validation where the application fails to distinguish between legitimate format specifiers and malicious input that could be used to manipulate program execution flow. Organizations running affected versions of icecast should immediately implement mitigations including upgrading to patched versions, implementing input validation measures, and applying network-level restrictions to limit exposure to this vulnerability. The remediation approach should include not only patch management but also comprehensive code review practices to identify similar format string vulnerabilities in other components of the system. This vulnerability demonstrates the critical importance of proper input sanitization and the dangers of allowing user-supplied data to directly influence format string operations within application code.
The technical exploitation of CVE-2001-0197 requires understanding how format string vulnerabilities function at the memory level. When the print_client function processes user input containing format specifiers, it directly passes this data to functions like printf or sprintf without proper validation. This allows attackers to manipulate the stack contents and potentially overwrite return addresses or function pointers. The vulnerability is particularly dangerous because it can be exploited to achieve arbitrary code execution through stack manipulation techniques. The impact extends beyond simple denial of service to full system compromise, especially when the icecast server operates with sufficient privileges to execute system commands. Security professionals should note that this vulnerability is characteristic of older software systems where security considerations were not as rigorously applied during development phases. The presence of such vulnerabilities in widely deployed software like icecast highlights the importance of maintaining up-to-date security patches and conducting regular vulnerability assessments. Organizations should implement comprehensive monitoring solutions to detect exploitation attempts and ensure that all network services are regularly updated to address known security flaws. The remediation process involves not only applying the appropriate patches but also establishing secure coding practices that prevent similar vulnerabilities from being introduced in future development cycles. This vulnerability serves as a historical example of how format string issues can lead to complete system compromise and underscores the need for robust input validation mechanisms in all software components. The exploitation of this vulnerability can be detected through network traffic analysis and log monitoring, particularly when analyzing client connection logs and error messages generated by the affected system.