CVE-2023-49954: 
3CX 3CXPhone vulnerability analysis and mitigation

The CRM Integration in 3CX versions before 18.0.9.23 and 20 before 20.0.0.1494 contains a critical SQL Injection vulnerability (CVE-2023-49954). The vulnerability allows attackers to perform SQL injection attacks via a first name, search string, or email address in the CRM integration templates used for connecting to various databases (CVE Details, Security Online).

The vulnerability exists in the CRM integration templates that use placeholders ([FirstName], [SearchText], [Email]) to populate database queries. These templates fail to properly sanitize user input when connecting to databases like MongoDB, MsSQL, MySQL, and PostgreSQL. The vulnerability has received a CVSS v3.1 Base Score of 9.8 (CRITICAL) with the vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H, indicating its severe nature (NVD).

The SQL injection vulnerability could allow attackers to manipulate database queries and potentially access or corrupt valuable data. According to 3CX's CISO Pierre Jourdan, approximately 0.25% of 3CX's user base (minimum of 875 customers) could be affected by this vulnerability. The attack vectors include both authenticated WebClient access and unauthenticated LiveChat API endpoints (Bleeping Computer).

Until the release of the hotfix (versions 18.0.9.23 and 20.0.0.1494), 3CX recommends customers disable CRM integration by setting the CRM solution to 'None'. This is currently the only viable workaround to protect against potential SQL injection attacks. The vulnerability specifically affects SQL Database Templates (MsSQL, MySQL, PostgreSQL), while customers using MongoDB or web-based CRM integration templates are not affected (Bleeping Computer).

The vulnerability was initially discovered by independent security researcher Theo Stein on October 11, 2023. Despite multiple attempts to contact 3CX through various channels, including CERT/CC, the company did not acknowledge the vulnerability until December 15, 2023. This delayed response has raised concerns in the security community about 3CX's vulnerability disclosure handling (Bleeping Computer).