CVE-2014-3427 in Voip Phone
Summary
by MITRE
CRLF injection vulnerability in Yealink VoIP Phones with firmware 28.72.0.2 allows remote attackers to inject arbitrary HTTP headers and conduct HTTP response splitting attacks via the model parameter to servlet.
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Analysis
by VulDB Data Team • 09/22/2024
The CVE-2014-3427 vulnerability represents a critical cross-site scripting and HTTP response splitting flaw discovered in Yealink VoIP phones running firmware version 28.72.0.2 and potentially other affected versions. This vulnerability resides in the web-based management interface of these telecommunications devices, specifically within the servlet component that processes incoming requests. The flaw stems from insufficient input validation and sanitization of the model parameter, which is utilized in the device's web server implementation. Attackers can exploit this weakness by crafting malicious HTTP requests that include carriage return line feed sequences within the model parameter, thereby manipulating the HTTP response headers. This vulnerability falls under the CWE-113 category for improper neutralization of CRLF sequences in HTTP headers and is closely related to the broader class of HTTP response splitting attacks that have been documented in various web application security frameworks. The attack vector is particularly concerning because it allows remote unauthenticated attackers to inject arbitrary HTTP headers into the response stream, potentially enabling them to redirect users to malicious websites or inject malicious content into web pages served by the affected devices.
The technical exploitation of this vulnerability requires the attacker to send a specially crafted HTTP request containing CRLF sequences in the model parameter to the vulnerable servlet endpoint. When the device processes this input without proper sanitization, it incorporates the malicious sequences into the HTTP response headers, effectively allowing the attacker to split the HTTP response into multiple parts. This manipulation can lead to various security consequences including session hijacking, cross-site scripting attacks, and cache poisoning. The vulnerability is particularly dangerous in enterprise environments where VoIP phones are often connected to internal networks and may be used for authentication or administrative functions. The impact extends beyond simple header injection as the attacker can potentially craft malicious responses that appear to originate from the legitimate device, enabling sophisticated social engineering attacks or man-in-the-middle scenarios. This type of vulnerability is classified under the ATT&CK technique T1190 for Proxying and T1071.004 for Application Layer Protocol HTTP, demonstrating how attackers can leverage web application flaws to manipulate network traffic.
The operational impact of CVE-2014-3427 is significant for organizations relying on Yealink VoIP infrastructure, particularly in environments where network security is paramount. The vulnerability can be exploited from external networks without requiring authentication, making it a prime target for automated scanning and exploitation campaigns. Once exploited, attackers can potentially redirect users to phishing sites, inject malicious scripts into web pages, or manipulate the device's web interface to gain unauthorized access to network resources. The affected firmware version 28.72.0.2 represents a specific release where the input validation mechanisms were insufficient to prevent the injection of CRLF sequences. Organizations using these devices face risks of data exfiltration, network disruption, and potential compromise of the broader enterprise network. The vulnerability's impact is amplified by the fact that VoIP phones often serve as entry points for network reconnaissance and may contain sensitive configuration information or authentication tokens. Mitigation efforts should include immediate firmware updates from Yealink, network segmentation to isolate VoIP infrastructure, and implementation of web application firewalls to detect and prevent such injection attacks. Security teams should also monitor for signs of exploitation through network traffic analysis and implement proper input validation controls at all network boundaries to prevent similar vulnerabilities from being exploited in other components of the VoIP infrastructure.