CVE-2020-1763 : Security Advisory and Response

A buffer read flaw in libreswan versions 3.27 to 3.31 allows attackers to crash the system via specially-crafted packets.

Understanding CVE-2020-1763

An overview of the vulnerability, its impact, technical details, and mitigation steps.

What is CVE-2020-1763?

This CVE describes an out-of-bounds buffer read flaw affecting the pluto daemon in libreswan versions 3.27 to 3.31. Attackers could exploit this vulnerability to crash libreswan by sending malicious IKEv1 Informational Exchange packets.

The Impact of CVE-2020-1763

The vulnerability is rated with a CVSS base score of 7.5, indicating a high severity issue with a potential high impact on system availability.

Technical Details of CVE-2020-1763

Insights into the vulnerability specifics.

Vulnerability Description

The flaw in the pluto daemon of libreswan versions 3.27 to 3.31 allows unauthenticated attackers to trigger a crash by sending crafted IKEv1 packets, leading to a system respawn.

Affected Systems and Versions

Product: libreswan
Vendor: the libreswan Project
Affected Versions: 3.27 to 3.31

Exploitation Mechanism

Attack Complexity: Low
Attack Vector: Network
Availability Impact: High
Privileges Required: None

Mitigation and Prevention

Measures to address the CVE-2020-1763 vulnerability.

Immediate Steps to Take

Apply vendor patches promptly
Monitor network traffic for signs of exploitation
Implement network segmentation to limit the attack surface

Long-Term Security Practices

Keep software and systems updated with the latest security patches
Conduct regular security assessments and penetration tests
Educate users on safe computing practices

Patching and Updates

Regularly check for security updates and apply patches issued by the vendor.