CVE-2007-5825 in Media Server
Summary
by MITRE
Format string vulnerability in the ws_addarg function in webserver.c in mt-dappd in Firefly Media Server 0.2.4 and earlier allows remote attackers to execute arbitrary code via a stats method action to /xml-rpc with format string specifiers in the (1) username or (2) password portion of base64-encoded data on the "Authorization: Basic" HTTP header line.
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Analysis
by VulDB Data Team • 07/29/2019
The vulnerability described in CVE-2007-5825 represents a critical format string flaw within the Firefly Media Server software ecosystem, specifically affecting versions 0.2.4 and earlier. This issue resides in the mt-dappd component's webserver.c file where the ws_addarg function fails to properly validate user input, creating a pathway for remote code execution through carefully crafted HTTP requests. The vulnerability manifests when the server processes XML-RPC requests containing base64-encoded authorization data, specifically targeting the username and password fields within the Authorization: Basic HTTP header. The flaw enables attackers to inject format string specifiers that can manipulate the server's memory operations and potentially execute arbitrary code with the privileges of the running service.
The technical exploitation of this vulnerability occurs through the manipulation of the stats method action within the XML-RPC interface, where the server's parsing of the Authorization header fails to sanitize the base64-encoded credentials before passing them to functions that perform string formatting operations. When the ws_addarg function processes these unvalidated inputs, it treats the format specifiers as actual formatting directives rather than literal data, leading to potential memory corruption and code execution. This type of vulnerability falls under CWE-134, which specifically addresses the use of format strings with user-supplied data without proper validation or sanitization. The attack vector requires a remote attacker to send a specially crafted HTTP request containing malicious format specifiers within the base64-encoded authorization header, which then gets processed by the vulnerable function during the server's authentication handling routine.
The operational impact of this vulnerability extends beyond simple privilege escalation as it provides attackers with complete control over the affected media server instance. Successful exploitation can result in unauthorized access to the media library, potential data exfiltration, and the ability to execute arbitrary commands on the host system. This represents a severe security risk for media servers that are accessible over networks, particularly those running older versions of Firefly Media Server where the vulnerability remains unpatched. The vulnerability affects systems that rely on XML-RPC interfaces for remote management and monitoring, making it particularly dangerous in enterprise environments where such interfaces are commonly exposed to external networks without proper access controls. The implications are further compounded by the fact that the vulnerability can be exploited without authentication requirements, as the malicious format strings can be embedded within the Authorization header itself.
Mitigation strategies for this vulnerability must address both immediate remediation and long-term security posture improvements. The primary solution involves upgrading to Firefly Media Server versions that have patched this vulnerability, as the original developers have released updates that properly validate and sanitize user inputs before processing them in formatting operations. Organizations should implement network segmentation to limit access to XML-RPC interfaces and ensure that authentication mechanisms are properly configured to prevent unauthorized access. Security monitoring should include detection of suspicious format string patterns in HTTP headers, particularly within Authorization fields. The implementation of input validation and sanitization measures at multiple layers of the application architecture can provide defense-in-depth protection against similar vulnerabilities. Additionally, regular security assessments and vulnerability scanning should be conducted to identify and remediate other potential format string vulnerabilities within the server infrastructure. This vulnerability demonstrates the critical importance of proper input validation and the potential for seemingly minor coding flaws to result in complete system compromise, aligning with ATT&CK technique T1059.007 for command and script injection through format string vulnerabilities.