CVE-2008-1250 in 320 SIP Phone
Summary
by MITRE
Multiple cross-site request forgery (CSRF) vulnerabilities in the web interface on the central phone server for the Snom 320 SIP Phone allow remote attackers to perform actions as the phone user, as demonstrated by inserting an address-book entry containing an XSS sequence.
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Analysis
by VulDB Data Team • 11/09/2017
The CVE-2008-1250 vulnerability represents a critical cross-site request forgery weakness discovered in the web interface of Snom 320 SIP phones, specifically within the central phone server component. This vulnerability stems from inadequate validation of HTTP requests originating from the web interface, allowing remote attackers to manipulate the phone's functionality through crafted malicious requests. The flaw exists in the authentication and authorization mechanisms that fail to properly verify the legitimacy of requests submitted through the web-based administrative interface, creating an exploitable pathway for unauthorized actions.
The technical implementation of this vulnerability involves the absence of proper anti-CSRF tokens or validation mechanisms within the phone server's web interface. When a user accesses the phone's administrative web interface, the system should validate that requests originate from legitimate sources and contain appropriate authentication tokens. However, the Snom 320's implementation fails to enforce these security checks, enabling attackers to construct malicious requests that appear to come from authenticated users. The demonstration of this vulnerability through address-book entry insertion containing XSS sequences illustrates how attackers can leverage CSRF to inject malicious content that executes within the context of the authenticated user's session, potentially leading to complete compromise of the phone's configuration and communication capabilities.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it enables attackers to perform arbitrary actions within the phone's administrative interface. This includes but is not limited to modifying phone settings, adding malicious entries to address books, altering user permissions, and potentially redirecting phone communications. The presence of XSS capabilities within the attack vector significantly amplifies the threat, as successful CSRF exploitation can lead to session hijacking, data exfiltration, and further network infiltration. Organizations relying on these devices for voice communications face substantial risks including unauthorized access to phone directories, potential interception of sensitive conversations, and compromise of the entire IP phone infrastructure.
This vulnerability aligns with CWE-352, which specifically addresses cross-site request forgery weaknesses in web applications and systems. The flaw demonstrates poor input validation and insufficient session management practices that violate fundamental web security principles. From an ATT&CK framework perspective, this vulnerability maps to technique T1566 for initial access through social engineering and T1071 for application layer protocol usage, as attackers can leverage the compromised phone's web interface to further expand their access within the network. The attack chain typically involves crafting malicious web pages or email attachments that, when viewed by an authenticated user, automatically submit CSRF requests to the vulnerable phone interface, effectively performing unauthorized actions on behalf of the legitimate user.
Organizations should implement immediate mitigations including disabling the web interface when not actively required, implementing proper anti-CSRF token mechanisms, and ensuring that all administrative interfaces require robust authentication and session management. Network segmentation and access controls should be enforced to limit exposure of these devices to untrusted networks. Regular security assessments and firmware updates are essential to address similar vulnerabilities in legacy systems. The vulnerability also highlights the importance of secure coding practices in embedded systems and the necessity of implementing proper CSRF protection mechanisms even in devices that may not traditionally be considered web-facing applications.