CVE-2023-40720 in FortiVoice
Summary
by MITRE • 05/14/2024
An authorization bypass through user-controlled key vulnerability [CWE-639] in FortiVoiceEntreprise version 7.0.0 through 7.0.1 and before 6.4.8 allows an authenticated attacker to read the SIP configuration of other users via crafted HTTP or HTTPS requests.
If you want to get best quality of vulnerability data, you may have to visit VulDB.
Analysis
by VulDB Data Team • 05/14/2024
This vulnerability represents a critical authorization bypass flaw that undermines the security model of FortiVoice Enterprise systems. The issue stems from insufficient validation of user permissions when processing requests for SIP configuration data, allowing authenticated attackers to exploit a user-controlled key mechanism to access sensitive information belonging to other users. The vulnerability affects versions 7.0.0 through 7.0.1 and prior releases before 6.4.8, indicating a prolonged period during which the system remained susceptible to this specific authorization bypass attack vector. The flaw operates through crafted HTTP or HTTPS requests that manipulate the key parameter used to identify target users, effectively circumventing the intended access controls that should restrict configuration data to authorized users only.
The technical implementation of this vulnerability aligns with CWE-639, which specifically addresses authorization flaws where user-controllable inputs are used to determine access permissions. Attackers can leverage this weakness by crafting malicious requests that specify arbitrary user identifiers within the SIP configuration retrieval process, thereby gaining unauthorized access to configuration details that should remain protected. The vulnerability demonstrates a fundamental breakdown in the principle of least privilege, where the system fails to properly validate whether the requesting user has legitimate authorization to access the specified user's SIP configuration data. This authorization bypass occurs at the application layer where user input is directly used to construct access control decisions without proper sanitization or validation of the input parameters.
The operational impact of this vulnerability extends beyond simple information disclosure, as SIP configuration data typically contains sensitive credentials, authentication parameters, and communication settings that could enable further attacks within the network. An attacker who successfully exploits this vulnerability could potentially gain access to user authentication tokens, server configurations, and communication protocols that might facilitate lateral movement or more sophisticated attacks. The fact that this vulnerability affects multiple versions within the 7.0.x release series suggests that the underlying authorization mechanism was not properly addressed during the development lifecycle, creating a persistent risk for organizations using these specific FortiVoice Enterprise versions. This authorization bypass could also serve as a stepping stone for attackers to escalate privileges or access additional system resources that rely on the same authentication mechanisms.
Organizations should prioritize immediate mitigation by upgrading to versions 6.4.8 or later where this vulnerability has been addressed through proper input validation and authorization checks. The implementation of additional network segmentation and monitoring controls can help detect unauthorized access attempts to SIP configuration endpoints. Security teams should also conduct comprehensive audits of user permissions and access controls within their FortiVoice Enterprise deployments to identify any potential exploitation attempts. This vulnerability highlights the importance of proper authorization validation in applications and underscores the need for security testing that specifically targets user-controlled input scenarios to prevent similar authorization bypass attacks. The remediation process should include reviewing all application endpoints that handle user-specific data to ensure proper access control mechanisms are in place.