CVE-2017-6627 : Vulnerability Insights and Analysis
Discover how CVE-2017-6627 affects Cisco IOS and IOS XE versions, allowing attackers to cause a denial of service (DoS) scenario by flooding the input queue with UDP packets. Learn mitigation steps and long-term security practices.
A weakness has been identified in the UDP processing code of Cisco IOS versions 15.1, 15.2, and 15.4, as well as IOS XE versions 3.14 through 3.18, allowing unauthorized manipulation of the input queue, leading to a denial of service (DoS) scenario.
Understanding CVE-2017-6627
This CVE involves a vulnerability in Cisco IOS and IOS XE that enables attackers to disrupt system functionality through UDP packet manipulation.
What is CVE-2017-6627?
The vulnerability in the UDP processing code of Cisco IOS and IOS XE versions allows unauthenticated attackers to cause a DoS situation by flooding the input queue with UDP packets.
The Impact of CVE-2017-6627
- Attackers can exploit the vulnerability to render the interface queue unresponsive, causing a DoS scenario.
- The issue stems from recent changes in Cisco IOS Software that create idle UDP sockets not properly closed, enabling malicious packet accumulation.
Technical Details of CVE-2017-6627
This section provides in-depth technical insights into the vulnerability.
Vulnerability Description
- The vulnerability allows attackers to manipulate the input queue of targeted systems, leading to a DoS condition.
Affected Systems and Versions
- Cisco IOS versions 15.1, 15.2, and 15.4
- IOS XE versions 3.14 through 3.18
Exploitation Mechanism
- Attackers exploit the vulnerability by sending UDP packets with a destination port of 0 to the affected device.
Mitigation and Prevention
Learn how to mitigate the risks associated with CVE-2017-6627.
Immediate Steps to Take
- Apply vendor-supplied patches promptly.
- Implement network traffic monitoring to detect and block malicious UDP packets.
- Configure network devices to drop UDP packets with a destination port of 0.
Long-Term Security Practices
- Regularly update and patch Cisco IOS and IOS XE systems.
- Conduct security assessments and audits to identify and address vulnerabilities.
Patching and Updates
- Stay informed about security advisories and updates from Cisco to address CVE-2017-6627 effectively.