CVE-2017-3808 : Security Advisory and Response
Learn about CVE-2017-3808, a vulnerability in Cisco Unified Communications Manager that could lead to a denial of service situation. Find out about affected versions and mitigation steps.
A vulnerability in the Session Initiation Protocol (SIP) UDP throttling mechanism of Cisco Unified Communications Manager could allow an attacker to cause a denial of service (DoS) situation on a targeted device.
Understanding CVE-2017-3808
This CVE involves a flaw in the SIP UDP throttling process of Cisco Unified Communications Manager, potentially leading to a DoS scenario.
What is CVE-2017-3808?
The vulnerability in Cisco Unified Communications Manager could be exploited by an unauthorized individual to send a high volume of SIP messages, causing the device to reload unexpectedly.
The Impact of CVE-2017-3808
- The vulnerability could result in a DoS situation on the affected device.
- The device will restart automatically along with its services after reloading.
Technical Details of CVE-2017-3808
This section provides more technical insights into the vulnerability.
Vulnerability Description
The vulnerability is a result of inadequate protection measures regarding rate limiting in the SIP UDP throttling mechanism of Cisco Unified Communications Manager.
Affected Systems and Versions
- Cisco Unified Communications Manager (CallManager) versions released before the initial update addressing this vulnerability are affected.
- The fix for this vulnerability is included in minor releases such as 10.5.2.14900-16, 11.0.1.23900-5, and 11.5.1.12900-2.
Exploitation Mechanism
- Attackers exploit the vulnerability by sending a high volume of SIP messages to the affected device.
- This action causes the device to reload unexpectedly, triggering a DoS condition.
Mitigation and Prevention
Protecting systems from CVE-2017-3808 is crucial to prevent potential attacks.
Immediate Steps to Take
- Apply the necessary security updates provided by Cisco to mitigate the vulnerability.
- Monitor network traffic for any unusual SIP message patterns.
Long-Term Security Practices
- Implement proper rate limiting measures to prevent excessive SIP message traffic.
- Regularly update and patch Cisco Unified Communications Manager to address security vulnerabilities.
Patching and Updates
- Ensure that the affected systems are updated to versions that include the fix for CVE-2017-3808.