CVE-2019-1676 Explained : Impact and Mitigation
Learn about CVE-2019-1676 affecting Cisco Meeting Server. Discover the impact, affected versions, and mitigation steps for this SIP processing DoS vulnerability.
Cisco Meeting Server SIP Processing Denial of Service Vulnerability
Understanding CVE-2019-1676
The Cisco Meeting Server (CMS) software is susceptible to a security weakness in its Session Initiation Protocol (SIP) call processing, potentially leading to a denial of service (DoS) situation.
What is CVE-2019-1676?
- Vulnerability in SIP call processing of Cisco Meeting Server (CMS)
- Allows unauthenticated remote attacker to trigger a DoS scenario
- Caused by inadequate validation of Session Description Protocol (SDP) messages
The Impact of CVE-2019-1676
- Attack Complexity: High
- Attack Vector: Network
- Availability Impact: High
- Base Score: 6.8 (Medium Severity)
- Exploitation could lead to DoS for all clients connected to CMS
Technical Details of CVE-2019-1676
The following technical details provide insight into the vulnerability.
Vulnerability Description
- Exploitable weakness in SIP call processing of CMS
- Unauthorized attacker can exploit the flaw remotely
Affected Systems and Versions
- Product: Cisco Meeting Server
- Vendor: Cisco
- Versions Affected: Preceding 2.3.9
Exploitation Mechanism
- Attacker crafts a specific SDP message to CMS call bridge
- Successful exploitation triggers CMS reload, causing DoS for connected clients
Mitigation and Prevention
Steps to address and prevent the vulnerability.
Immediate Steps to Take
- Update CMS to version 2.3.9 or higher
- Implement network security measures to detect and block malicious SIP traffic
Long-Term Security Practices
- Regularly monitor and update CMS software
- Conduct security assessments to identify and mitigate vulnerabilities
Patching and Updates
- Apply security patches provided by Cisco
- Stay informed about security advisories and updates from Cisco