CVE-2019-1887 : Vulnerability Insights and Analysis
Learn about CVE-2019-1887, a high-severity vulnerability in Cisco Unified Communications Manager allowing remote attackers to disrupt service via SIP. Find mitigation steps here.
Cisco Unified Communications Manager Session Initiation Protocol Denial of Service Vulnerability
Understanding CVE-2019-1887
An unauthenticated, remote attacker could exploit a weakness in the Session Initiation Protocol (SIP) implementation of Cisco Unified Communications Manager to disrupt service.
What is CVE-2019-1887?
This vulnerability arises from inadequate validation of incoming SIP traffic, allowing an attacker to send a malformed SIP packet to the affected Cisco Unified Communications Manager, initiating a new registration process on all connected phones.
The Impact of CVE-2019-1887
- CVSS Score: 8.6 (High Severity)
- Attack Vector: Network
- Availability Impact: High
- The attacker can cause a temporary service disruption by exploiting this vulnerability.
Technical Details of CVE-2019-1887
The following technical details provide insight into the vulnerability.
Vulnerability Description
The vulnerability in the SIP protocol implementation of Cisco Unified Communications Manager allows an attacker to trigger a denial of service condition by sending a malformed SIP packet.
Affected Systems and Versions
- Product: Cisco Unified Communications Manager
- Vendor: Cisco
- Affected Versions: Less than 12.0(1)SU3
Exploitation Mechanism
- An unauthenticated, remote attacker can exploit the vulnerability by sending a specially crafted SIP packet to the affected system, disrupting service temporarily.
Mitigation and Prevention
Taking immediate steps and implementing long-term security practices can help mitigate the risks associated with CVE-2019-1887.
Immediate Steps to Take
- Apply vendor patches or updates as soon as they are available.
- Monitor network traffic for any suspicious activity related to SIP.
Long-Term Security Practices
- Regularly update and patch all software and systems to prevent vulnerabilities.
- Implement network segmentation to limit the impact of potential attacks.
Patching and Updates
- Stay informed about security advisories from Cisco and apply relevant patches promptly.