CVE-2017-3865 : What You Need to Know
Learn about CVE-2017-3865, a vulnerability in Cisco StarOS for ASR 5000 Series Routers allowing attackers to disrupt IPsec VPN tunnels, leading to a denial of service (DoS) condition. Find out affected systems, versions, and mitigation steps.
A vulnerability has been identified in the IPsec component of Cisco StarOS for Cisco ASR 5000 Series Routers, potentially leading to a denial of service (DoS) condition.
Understanding CVE-2017-3865
This CVE pertains to a vulnerability in the IPsec component of Cisco StarOS for Cisco ASR 5000 Series Routers that could be exploited by an unauthenticated, remote attacker.
What is CVE-2017-3865?
The vulnerability allows an attacker to terminate active IPsec VPN tunnels and prevent the establishment of new tunnels, resulting in a DoS condition.
The Impact of CVE-2017-3865
Exploitation of this vulnerability could lead to the termination of all active IPsec VPN tunnels, potentially causing a denial of service situation.
Technical Details of CVE-2017-3865
This section provides more technical insights into the vulnerability.
Vulnerability Description
The vulnerability in the IPsec component of Cisco StarOS for ASR 5000 Series Routers allows unauthenticated attackers to disrupt VPN tunnels, leading to a DoS scenario.
Affected Systems and Versions
- Affected Products: ASR 5000 Series Routers, Virtualized Packet Core (VPC) Software
- Known Affected Releases: 21.1.0, 21.1.M0.65601, 21.1.v0
- Known Fixed Releases: 21.2.A0.65754, 21.1.b0.66164, 21.1.V0.66014, 21.1.R0.65759, 21.1.M0.65749, 21.1.0.66030, 21.1.0
Exploitation Mechanism
The vulnerability can be exploited by an unauthenticated, remote attacker to disrupt IPsec VPN tunnels, causing a DoS condition.
Mitigation and Prevention
Steps to mitigate and prevent the exploitation of CVE-2017-3865.
Immediate Steps to Take
- Apply the provided fixes in the known fixed releases to address the vulnerability.
- Monitor network traffic for any signs of exploitation.
Long-Term Security Practices
- Regularly update and patch affected systems to prevent vulnerabilities.
- Implement strong authentication mechanisms to prevent unauthorized access.
Patching and Updates
- Ensure all affected systems are updated to the fixed releases mentioned to mitigate the vulnerability.