CVE-2017-6763 : Security Advisory and Response
Learn about CVE-2017-6763, a vulnerability in Cisco Meeting Server (CMS) 2.1.4 allowing a DoS attack. Find mitigation steps and prevention measures to secure your system.
A weakness in the H.264 protocol implementation in Cisco Meeting Server (CMS) 2.1.4 could lead to a denial of service (DoS) attack. An attacker could exploit this vulnerability to disrupt the CMS media process, causing a temporary interruption in media traffic.
Understanding CVE-2017-6763
This CVE identifies a vulnerability in the H.264 protocol implementation in Cisco Meeting Server (CMS) 2.1.4.
What is CVE-2017-6763?
The vulnerability allows an unauthorized remote attacker to trigger a DoS condition on a targeted system by sending a crafted H.264 FU-A packet through the affected application.
The Impact of CVE-2017-6763
- Successful exploitation can lead to a DoS condition on the impacted system, causing an unexpected restart of the CMS media process.
- While the CMS platform remains operational, users may experience a brief disruption in media traffic.
Technical Details of CVE-2017-6763
This section provides technical details of the vulnerability.
Vulnerability Description
The vulnerability arises from the lack of proper validation of Fragmentation Unit (FU-A) protocol packets within the affected application.
Affected Systems and Versions
- Product: Cisco Meeting Server
- Version: Cisco Meeting Server
Exploitation Mechanism
- An attacker can exploit the flaw by sending a meticulously crafted H.264 FU-A packet through the affected application.
Mitigation and Prevention
Steps to address and prevent the CVE-2017-6763 vulnerability.
Immediate Steps to Take
- Apply vendor-provided patches or updates promptly.
- Monitor network traffic for any suspicious activity.
- Implement firewall rules to restrict unauthorized access.
Long-Term Security Practices
- Regularly update and patch software to address known vulnerabilities.
- Conduct security assessments and penetration testing to identify weaknesses.
- Educate users on security best practices to prevent social engineering attacks.
Patching and Updates
- Stay informed about security advisories from Cisco.
- Apply recommended patches and updates to mitigate the vulnerability effectively.