CVE-2007-3347 in DPH-540
Summary
by MITRE
The D-Link DPH-540/DPH-541 phone accepts SIP INVITE messages that are not from the Call Server s IP address, which allows remote attackers to engage in arbitrary SIP communication with the phone, as demonstrated by communication with forged caller ID.
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Analysis
by VulDB Data Team • 09/04/2018
The vulnerability identified as CVE-2007-3347 affects D-Link DPH-540 and DPH-541 IP phone devices that implement Session Initiation Protocol for voice communication. These devices fail to properly validate the source IP address of incoming SIP INVITE messages, creating a significant security flaw in the authentication and authorization mechanisms of the phone system. This weakness allows unauthorized remote attackers to bypass normal call routing procedures and establish arbitrary SIP communication sessions with the affected devices.
The technical flaw resides in the lack of proper source address validation within the SIP message processing pipeline of these IP phones. When a SIP INVITE message is received, the device should verify that the message originates from a legitimate call server or authorized endpoint before accepting and processing the communication request. However, the D-Link phones accept INVITE messages from any IP address, regardless of whether the sender is authorized to make calls through the system. This represents a fundamental breakdown in network security controls and demonstrates poor implementation of the SIP protocol security model.
The operational impact of this vulnerability is substantial and multifaceted. Remote attackers can exploit this weakness to conduct unauthorized communication sessions, potentially leading to eavesdropping on calls, manipulation of call routing, and unauthorized access to the phone system. The demonstration of forged caller ID functionality indicates that attackers can manipulate the identity of callers, which could be used for social engineering attacks, impersonation of legitimate users, or disruption of business communications. This vulnerability essentially allows attackers to bypass the phone system's intended security boundaries and gain unauthorized access to voice communication capabilities.
This vulnerability maps to CWE-284 Access Control Issues, specifically related to inadequate access control mechanisms for network communication protocols. The flaw also aligns with ATT&CK technique T1190 Exploit Public-Facing Application, as the vulnerability exists in a publicly accessible communication protocol implementation. The lack of proper source validation represents a failure in implementing the principle of least privilege for network communications, where the device should only accept legitimate communication from authorized sources.
Mitigation strategies should focus on implementing network-level controls such as firewall rules that restrict access to the SIP ports and services to only trusted IP addresses. Network segmentation can help isolate these devices from untrusted networks, while implementing proper SIP authentication mechanisms and secure communication protocols can provide additional layers of protection. Regular security assessments of networked devices should be conducted to identify similar vulnerabilities in other communication equipment, and firmware updates should be applied promptly when available to address known security issues. Organizations should also consider implementing network monitoring solutions to detect anomalous SIP traffic patterns that may indicate exploitation attempts.