CVE-2014-9018 in Icecast
Summary
by MITRE
Icecast before 2.4.1 transmits the output of the on-connect script, which might allow remote attackers to obtain sensitive information, related to shared file descriptors.
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Analysis
by VulDB Data Team • 04/07/2022
The vulnerability identified as CVE-2014-9018 affects Icecast media streaming servers version 2.4.1 and earlier, presenting a significant information disclosure risk through improper handling of shared file descriptors during script execution. This flaw resides in the server's implementation of the on-connect script functionality, where the output generated by these scripts is inadvertently transmitted to connected clients, potentially exposing sensitive system information to remote attackers. The issue stems from the server's failure to properly isolate the execution environment of on-connect scripts from the network output stream, creating an attack vector that could be exploited by malicious actors to gain unauthorized access to system-level information.
The technical implementation of this vulnerability involves the improper management of file descriptor inheritance within the Icecast process execution model. When an on-connect script executes, it inherits file descriptors from the parent process, including those associated with network sockets and other system resources. The vulnerability occurs because the server does not properly sanitize or isolate the script output before transmitting it to connected clients, allowing the script's stdout and stderr streams to leak into the network response. This design flaw enables attackers to capture the output of the on-connect script, which may contain sensitive information such as system paths, configuration details, or other data that could aid in further exploitation attempts.
The operational impact of this vulnerability extends beyond simple information disclosure, as it can serve as a foundational attack vector for more sophisticated exploitation techniques. Remote attackers can leverage this vulnerability to gather reconnaissance information about the target system, potentially identifying system architecture details, installed software versions, or configuration parameters that could be used to craft more targeted attacks. The vulnerability particularly affects environments where Icecast servers are deployed with on-connect scripts that might output system information, making it a significant concern for organizations running media streaming services that may inadvertently expose sensitive operational data. This information leakage can facilitate subsequent attacks such as privilege escalation, system compromise, or further reconnaissance activities.
Mitigation strategies for CVE-2014-9018 should prioritize immediate patching of affected Icecast installations to version 2.4.1 or later, which contains the necessary fixes to properly isolate script execution output from network transmission. Organizations should also implement strict access controls and network segmentation to limit exposure of Icecast servers to untrusted networks, ensuring that only authorized clients can connect to streaming services. Additionally, administrators should review and sanitize all on-connect scripts to minimize the potential for information leakage, avoiding the inclusion of system-specific details or configuration data in script outputs. The vulnerability aligns with CWE-200, which addresses information exposure, and could potentially be leveraged in attacks consistent with techniques described in the ATT&CK framework under initial access and reconnaissance phases, particularly through the use of information gathering techniques to identify system weaknesses. Organizations should also consider implementing network monitoring solutions to detect unusual data transmission patterns that might indicate exploitation attempts.