CVE-2001-0784 in Icecast
Summary
by MITRE
Directory traversal vulnerability in Icecast 1.3.10 and earlier allows remote attackers to read arbitrary files via a modified .. (dot dot) attack using encoded URL characters.
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Analysis
by VulDB Data Team • 12/22/2024
The vulnerability identified as CVE-2001-0784 represents a critical directory traversal flaw affecting Icecast versions 1.3.10 and earlier, which has significant implications for media streaming server security. This vulnerability stems from inadequate input validation within the Icecast streaming server software, specifically in how it processes URL-encoded characters during file access requests. The flaw allows malicious actors to bypass normal file access controls and retrieve arbitrary files from the server's filesystem, potentially exposing sensitive configuration data, user information, or system files.
The technical mechanism of this vulnerability operates through the exploitation of URL encoding techniques combined with directory traversal sequences. Attackers can craft specially formatted requests containing encoded dot-dot sequences that, when processed by the vulnerable Icecast server, result in unintended file system navigation. This occurs because the server fails to properly sanitize or validate the URL components before resolving file paths, allowing attackers to traverse directories beyond the intended media serving boundaries. The vulnerability specifically targets the server's handling of encoded characters, making it particularly dangerous as it can bypass traditional security measures that might only inspect unencoded input.
From an operational perspective, this vulnerability creates severe risks for organizations relying on Icecast for media streaming services. An attacker who successfully exploits this flaw could gain access to sensitive files including configuration files that might contain database credentials, administrative passwords, or other system-level information. The impact extends beyond simple information disclosure, as attackers could potentially access log files that reveal system architecture details, user access patterns, or other intelligence that could facilitate further attacks. Additionally, the vulnerability could be leveraged to retrieve system binaries or configuration files that might contain further exploitable weaknesses within the server environment.
The vulnerability aligns with CWE-22, which specifically addresses improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal attacks. This classification indicates that the flaw represents a fundamental security issue in how the application handles file system path resolution. From an ATT&CK framework perspective, this vulnerability maps to T1083 (File and Directory Discovery) and potentially T1566 (Phishing) if attackers use the retrieved information to craft more sophisticated social engineering campaigns. The attack chain typically involves reconnaissance, crafting malicious requests with encoded path traversal sequences, and exploiting the server's failure to validate input properly. Organizations using affected versions of Icecast should consider this vulnerability as a high-priority threat requiring immediate remediation.
Mitigation strategies for CVE-2001-0784 primarily focus on immediate version upgrades to Icecast 1.3.11 or later, which contain patches addressing the directory traversal vulnerability. System administrators should also implement network-level controls including firewall rules that restrict access to streaming ports and services, and deploy web application firewalls that can detect and block malicious path traversal attempts. Input validation should be strengthened at multiple layers including application-level sanitization of URL parameters, implementation of proper access controls that restrict file system access to legitimate media directories, and regular security audits of streaming server configurations. Additionally, organizations should consider implementing intrusion detection systems that can identify suspicious patterns in network traffic related to directory traversal attempts, and maintain comprehensive monitoring of file access logs to detect potential exploitation attempts. The vulnerability serves as a reminder of the critical importance of proper input validation and access control mechanisms in network services, particularly those handling user-supplied data that may contain path traversal sequences.