CVE-2020-27638 : Security Advisory and Response
Learn about CVE-2020-27638, a vulnerability in fastd software before v21 that allows denial of service attacks by triggering an assertion failure with invalid type codes. Find out how to mitigate and prevent exploitation.
Fastd before v21 allows denial of service due to an assertion failure when receiving packets with an invalid type code.
Understanding CVE-2020-27638
This CVE involves a vulnerability in the fastd software that can lead to denial of service attacks.
What is CVE-2020-27638?
The vulnerability in fastd before version 21 can be exploited to cause a denial of service by triggering an assertion failure when processing packets with an invalid type code.
The Impact of CVE-2020-27638
The vulnerability can be exploited by attackers to disrupt the normal operation of the fastd software, potentially leading to service unavailability.
Technical Details of CVE-2020-27638
Fastd before v21 is susceptible to a denial of service vulnerability due to improper handling of packets.
Vulnerability Description
The issue arises from a failure to properly handle packets with invalid type codes, resulting in an assertion failure and potential denial of service.
Affected Systems and Versions
- Product: fastd
- Vendor: N/A
- Versions affected: All versions before v21
Exploitation Mechanism
Attackers can exploit this vulnerability by sending specially crafted packets with invalid type codes to the fastd software, triggering the assertion failure and causing a denial of service.
Mitigation and Prevention
It is crucial to take immediate steps to mitigate the impact of CVE-2020-27638 and prevent potential attacks.
Immediate Steps to Take
- Update fastd to version 21 or newer to address the vulnerability.
- Monitor network traffic for any signs of exploitation.
- Implement network segmentation to limit the impact of potential attacks.
Long-Term Security Practices
- Regularly update software and apply security patches promptly.
- Conduct security assessments and penetration testing to identify and address vulnerabilities.
- Educate users and administrators about safe computing practices and the importance of security updates.
Patching and Updates
Ensure that fastd is regularly updated to the latest version to patch known vulnerabilities and enhance the overall security posture.