CVE-2008-1248 in 320 SIP Phone
Summary
by MITRE
The web interface on the central phone server for the Snom 320 SIP Phone allows remote attackers to make arbitrary phone calls via the "Call a number" field. NOTE: this might overlap CVE-2007-3440.
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Analysis
by VulDB Data Team • 04/12/2019
The vulnerability identified as CVE-2008-1248 affects the Snom 320 SIP phone's central phone server web interface, representing a critical security flaw that enables remote attackers to execute unauthorized phone calls. This vulnerability resides within the web-based management interface of the phone server system, which provides administrative access to various telephony functions including call routing and device configuration. The specific technical flaw manifests in the "Call a number" field functionality, where input validation mechanisms fail to properly sanitize user-provided data, creating an avenue for malicious exploitation.
The operational impact of this vulnerability extends beyond simple unauthorized call initiation, as it represents a privilege escalation vector that allows attackers to bypass normal call restrictions and potentially access restricted phone numbers or services. The vulnerability's nature aligns with CWE-20, which describes improper input validation, and specifically relates to CWE-79, input validation and XSS vulnerabilities, though the primary concern here involves arbitrary command execution rather than cross-site scripting. Attackers can leverage this flaw to make calls to any number without proper authorization, potentially leading to financial loss through unauthorized long-distance calls or security breaches through access to restricted communication channels.
From an attack perspective, this vulnerability maps to several ATT&CK techniques including T1190 for exploit public-facing application and T1071 for application layer protocol usage. The attack surface is particularly concerning as it involves a web interface that may be accessible from external networks, making it exploitable by remote attackers without physical access to the device. The overlap with CVE-2007-3440 suggests a pattern of similar vulnerabilities in the Snom 320 phone system, indicating potential architectural weaknesses in the web interface implementation that require comprehensive remediation rather than isolated fixes. Organizations utilizing this phone system face significant risk of unauthorized access to their telephony infrastructure, potentially compromising both operational security and financial integrity through unauthorized call usage.
The recommended mitigation strategies include implementing proper input validation and sanitization measures within the web interface, restricting external access to the phone server management interface through network segmentation, and applying firmware updates provided by the vendor to address the specific vulnerability. Additionally, organizations should consider implementing network access controls to limit who can access the web interface and establish monitoring procedures to detect unauthorized call attempts. The vulnerability underscores the importance of secure web application development practices and proper input validation, particularly in telephony systems where unauthorized access can have both financial and security implications.