CVE-2007-4382 in X-Lite
Summary
by MITRE
CounterPath X-Lite 3.0 34025, and possibly eyeBeam, allows remote attackers to cause a denial of service (device crash) via a SIP INVITE message without a Content-Type header.
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Analysis
by VulDB Data Team • 09/30/2024
The vulnerability identified as CVE-2007-4382 affects CounterPath X-Lite version 3.0 build 34025 and potentially eyeBeam softphone applications. This issue represents a classic denial of service weakness that exploits the improper handling of Session Initiation Protocol messages within the SIP stack. The vulnerability specifically targets the processing of SIP INVITE requests that lack the mandatory Content-Type header field, which is a fundamental component of the SIP protocol specification. When these applications receive such malformed messages, they fail to properly validate the incoming SIP INVITE and subsequently crash or become unresponsive, leading to a complete denial of service condition for the affected device or endpoint.
The technical flaw manifests in the application's SIP message parsing logic where the software does not implement adequate input validation for SIP INVITE messages. According to the SIP specification defined in RFC 3261, while the Content-Type header is optional for certain SIP methods, the absence of proper error handling when this header is missing can lead to application instability. The vulnerability stems from the application's failure to gracefully handle malformed SIP messages, which is a common pattern in software implementations that do not follow robust input validation principles. This weakness falls under the category of improper input validation as classified by CWE-20, specifically representing a condition where applications do not adequately check or sanitize input data before processing it. The flaw demonstrates a lack of defensive programming practices that should be implemented to prevent application crashes from malformed input.
The operational impact of this vulnerability extends beyond simple service disruption as it can be exploited remotely by attackers positioned outside the network perimeter. This makes it particularly dangerous in enterprise environments where VoIP systems are deployed, as unauthorized users can potentially bring down critical communication infrastructure without requiring any authentication or privileged access. The denial of service condition affects not only the targeted softphone application but can also impact the broader communication network as VoIP systems often integrate with other network services and may cause cascading failures. The vulnerability is particularly concerning because it requires minimal effort from attackers to exploit, as they only need to send a single malformed SIP INVITE message to trigger the crash. This characteristic aligns with the ATT&CK framework's concept of privilege escalation through service exploitation, where attackers can leverage application-level vulnerabilities to disrupt service availability.
Mitigation strategies for this vulnerability should focus on implementing proper input validation and error handling within the SIP processing stack. Network administrators should ensure that all affected applications are updated to versions that properly handle missing Content-Type headers in SIP INVITE messages. Additionally, implementing SIP message filtering at network boundaries can provide an additional layer of protection by blocking malformed SIP traffic before it reaches the vulnerable endpoints. The solution should also include monitoring and alerting mechanisms that can detect unusual SIP traffic patterns that may indicate exploitation attempts. Organizations should consider implementing SIP-specific security appliances or firewalls that can inspect and validate SIP messages for compliance with protocol standards. This vulnerability highlights the importance of adhering to security best practices in telecommunications software development and demonstrates the critical need for robust error handling in network-facing applications. The remediation process should also involve conducting thorough security testing of SIP implementations to identify similar weaknesses in other components of the communication infrastructure.