CVE-2018-17539 : Exploit Details and Defense Strategies
Learn about CVE-2018-17539, a vulnerability in BGP daemons of IP Infusion ZebOS and OcNOS versions allowing remote attackers to trigger denial of service attacks. Find mitigation steps and preventive measures.
The BGP daemon (bgpd) in every version of IP Infusion ZebOS up to 7.10.6 and every version of OcNOS up to 1.3.3.145 is vulnerable to a denial of service attack caused by remote attackers. This can be accomplished by including an autonomous system (AS) path that consists of 8 or more autonomous system number (ASN) elements.
Understanding CVE-2018-17539
This CVE identifies a vulnerability in BGP daemons of specific versions that can be exploited by remote attackers to launch a denial of service attack.
What is CVE-2018-17539?
The vulnerability in the BGP daemon allows attackers to trigger a denial of service attack by manipulating the AS path with a specific number of ASN elements.
The Impact of CVE-2018-17539
The vulnerability can lead to service disruption and potential downtime for affected systems, impacting network availability and stability.
Technical Details of CVE-2018-17539
The technical aspects of the vulnerability are crucial for understanding its implications and potential risks.
Vulnerability Description
The BGP daemon in IP Infusion ZebOS and OcNOS versions allows remote attackers to exploit the AS path, leading to a denial of service attack.
Affected Systems and Versions
- IP Infusion ZebOS up to version 7.10.6
- OcNOS up to version 1.3.3.145
Exploitation Mechanism
Attackers can exploit the vulnerability by crafting an AS path with 8 or more ASN elements, triggering the denial of service attack.
Mitigation and Prevention
Taking immediate steps and implementing long-term security practices are essential to mitigate the risks associated with CVE-2018-17539.
Immediate Steps to Take
- Monitor network traffic for any suspicious AS paths with an unusual number of ASN elements.
- Apply filters to restrict the acceptance of BGP updates with excessive ASN elements.
- Update BGP daemon software to patched versions that address the vulnerability.
Long-Term Security Practices
- Regularly update and patch BGP daemon software to protect against known vulnerabilities.
- Conduct security assessments and audits to identify and address potential weaknesses in BGP configurations.
Patching and Updates
- Ensure timely installation of security patches provided by the vendors to fix the vulnerability in affected versions.