GLSA 202007-21: Libreswan: Denial of service

http://security.gentoo.org/

Severity:	normal
Title:	Libreswan: Denial of service
Date:	07/27/2020
Bugs:	#722696
ID:	202007-21

Synopsis

A vulnerability in Libreswan could lead to a Denial of Service condition.

Background

Libreswan is a free software implementation of the most widely supported and standarized VPN protocol based on (“IPsec”) and the Internet Key Exchange (“IKE”).

Affected packages

Package	Vulnerable	Unaffected	Architecture(s)
net-vpn/libreswan	< 3.32	>= 3.32	All supported architectures

Description

As a result of a bug in handling certain bogus encrypted IKEv1, while building a log message that the packet has been dropped, a NULL pointer dereference causes Libreswan to crash and restart when it attempts to log the state name involved.

Impact

An attacker could cause a possible Denial of Service condition.

Workaround

There is no known workaround at this time.

Resolution

All Libreswan users should upgrade to the latest version:

      # emerge --sync
      # emerge --ask --oneshot --verbose ">=net-vpn/libreswan-3.32"

References

CVE-2020-1763

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-202007-21.xml

Concerns?

Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.