CVE-2006-2548 in Prodder
Summary
by MITRE
Prodder before 0.5, and perlpodder before 0.5, allows remote attackers to execute arbitrary code via shell metacharacters in the URL of a podcast (url attribute of an enclosure tag, or $enc_url variable), which is executed when running wget.
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Analysis
by VulDB Data Team • 03/08/2025
The vulnerability identified as CVE-2006-2548 affects Prodder and perlpodder podcast management tools prior to version 0.5, representing a critical remote code execution flaw that exploits improper input validation in podcast URL handling. This vulnerability resides in the manner these tools process podcast enclosure URLs, specifically when parsing the url attribute within enclosure tags or the $enc_url variable, creating a dangerous condition where attacker-controlled input can be directly executed by the underlying wget command. The flaw demonstrates characteristics consistent with CWE-78, which describes improper neutralization of special elements used in operating system commands, making it a classic command injection vulnerability that allows remote attackers to execute arbitrary system commands with the privileges of the user running the podcast management tool.
The technical implementation of this vulnerability occurs when the podcast management tools receive a maliciously crafted podcast feed containing specially formatted URLs within enclosure tags. When these tools process the feed and attempt to download the podcast content using wget, they fail to properly sanitize or escape the URL parameters before passing them to the operating system command. This allows attackers to inject shell metacharacters such as semicolons, ampersands, or backticks that are interpreted by the shell, enabling arbitrary command execution on the target system. The vulnerability is particularly concerning because it operates at the command execution layer, where user input directly influences system-level operations without proper validation or sanitization.
The operational impact of this vulnerability extends beyond simple code execution, as it can lead to complete system compromise when the podcast management tool is running with elevated privileges. Attackers can leverage this vulnerability to install backdoors, exfiltrate data, modify system configurations, or establish persistent access to the compromised system. The remote nature of the attack means that malicious actors do not need physical access to the system, and the vulnerability can be exploited through malicious podcast feeds distributed via various channels. This creates a significant risk for organizations that automatically process or subscribe to external podcast feeds, as the attack can occur without user interaction or awareness. The vulnerability also demonstrates characteristics aligned with ATT&CK technique T1059.007 for command and script interpreter, where adversaries use legitimate system utilities to execute malicious commands.
Mitigation strategies for this vulnerability require immediate patching of affected versions to version 0.5 or later, where proper input sanitization has been implemented. Organizations should also consider implementing network-level restrictions on outbound wget connections to limit potential exploitation, though this approach provides only partial protection. Input validation mechanisms must be strengthened to properly escape or filter shell metacharacters from all user-supplied data, particularly URL parameters. Additionally, the principle of least privilege should be enforced by running podcast management tools with minimal required permissions, preventing attackers from gaining elevated system access even if exploitation occurs. Security monitoring should include detection of unusual wget command executions and suspicious network connections initiated by podcast management tools. The vulnerability serves as a reminder of the critical importance of input validation in applications that interact with external data sources and execute system commands, emphasizing the need for comprehensive security practices that address both application-level and system-level vulnerabilities.