CVE-2017-16227 : Vulnerability Insights and Analysis
Learn about CVE-2017-16227, a Quagga vulnerability in the aspath_put function allowing remote attackers to cause denial of service through BGP UPDATE messages. Find mitigation steps and affected versions.
Quagga, specifically the aspath_put function in bgpd/bgp_aspath.c, has a vulnerability in versions prior to 1.2.2 that can be exploited by remote attackers through BGP UPDATE messages, resulting in a denial of service.
Understanding CVE-2017-16227
This CVE entry relates to a vulnerability in Quagga's aspath_put function that allows for a denial of service attack through BGP UPDATE messages.
What is CVE-2017-16227?
The vulnerability in Quagga's aspath_put function in bgpd/bgp_aspath.c before version 1.2.2 allows remote attackers to cause a denial of service by sending BGP UPDATE messages. The issue stems from incorrect AS_PATH size calculation for long paths, leading to the creation of an invalid message.
The Impact of CVE-2017-16227
Exploitation of this vulnerability can result in a denial of service, causing affected systems to drop sessions and potentially disrupting network operations.
Technical Details of CVE-2017-16227
This section delves into the technical aspects of the CVE, including the vulnerability description, affected systems, and the exploitation mechanism.
Vulnerability Description
The aspath_put function in Quagga before version 1.2.2 allows remote attackers to trigger a denial of service by manipulating BGP UPDATE messages. The miscalculation of AS_PATH size for long paths leads to the construction of an invalid message.
Affected Systems and Versions
- Product: Quagga
- Vendor: N/A
- Versions Affected: Prior to 1.2.2
Exploitation Mechanism
The vulnerability can be exploited remotely by sending specially crafted BGP UPDATE messages, taking advantage of the incorrect AS_PATH size calculation to disrupt network services.
Mitigation and Prevention
Protecting systems from CVE-2017-16227 involves immediate steps and long-term security practices.
Immediate Steps to Take
- Update Quagga to version 1.2.2 or later to mitigate the vulnerability.
- Monitor network traffic for any suspicious BGP UPDATE messages.
Long-Term Security Practices
- Regularly update and patch Quagga and other network software to address known vulnerabilities.
- Implement network segmentation and access controls to limit the impact of potential attacks.
Patching and Updates
- Apply patches provided by Quagga to fix the vulnerability.
- Stay informed about security advisories and updates from Quagga and relevant vendors.