CVE-2013-5757 in SIP-T38G
Summary
by MITRE
Absolute path traversal vulnerability in Yealink VoIP Phone SIP-T38G allows remote authenticated users to read arbitrary files via a full pathname in the dumpConfigFile function in the command parameter to cgi-bin/cgiServer.exx.
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Analysis
by VulDB Data Team • 10/09/2024
The CVE-2013-5757 vulnerability represents a critical absolute path traversal flaw in Yealink VoIP phone models, specifically the SIP-T38G device. This vulnerability exists within the web-based administration interface of the device, where the dumpConfigFile function fails to properly validate user-supplied input parameters. The flaw allows authenticated remote attackers to manipulate the command parameter in the cgi-bin/cgiServer.exx endpoint to access arbitrary files on the device filesystem. The vulnerability stems from insufficient input sanitization and improper path validation mechanisms within the device's web server implementation.
The technical exploitation of this vulnerability occurs through a carefully crafted HTTP request that includes a full pathname in the command parameter of the cgiServer.exx endpoint. When the device processes this input without proper validation, it directly interprets the malicious path specification and attempts to read the specified file from the device's file system. This allows an authenticated attacker to traverse the filesystem and access sensitive configuration files, log files, and potentially system credentials that should remain protected. The vulnerability is particularly dangerous because it operates within the device's legitimate administrative interface, making it difficult to detect through standard network monitoring.
The operational impact of this vulnerability extends beyond simple information disclosure, as it can potentially lead to complete system compromise. An attacker who gains access to configuration files may extract sensitive information such as SIP account credentials, network configuration details, and other administrative settings that could facilitate further attacks. The vulnerability affects the device's authentication model since it requires valid credentials to exploit, but once accessed, it provides a significant foothold for lateral movement within the network. This aligns with attack patterns documented in the attack technique matrix under credential access and privilege escalation categories, where initial authentication is used to gain deeper system access.
Mitigation strategies for CVE-2013-5757 should focus on immediate patching of affected firmware versions and implementation of network segmentation controls. Organizations should ensure that Yealink devices are updated to the latest firmware releases that address this path traversal vulnerability. Network access controls should be implemented to restrict access to the device's administrative interfaces, limiting access to trusted network segments only. Additionally, implementing proper input validation mechanisms and using secure coding practices in web application development can prevent similar vulnerabilities from occurring. The vulnerability maps to CWE-22 Path Traversal and CWE-77 Path Traversal in the Common Weakness Enumeration catalog, which are classified as high-risk security issues requiring immediate attention. Regular security assessments and vulnerability scanning should be conducted to identify similar issues in other networked devices within the organization's infrastructure.