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[ GLSA 202007-21 ] Libreswan
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Joined: 12 May 2004
Posts: 2454

PostPosted: Mon Jul 27, 2020 7:26 pm    Post subject: [ GLSA 202007-21 ] Libreswan Reply with quote

Gentoo Linux Security Advisory

Title: Libreswan: Denial of service (GLSA 202007-21)
Severity: normal
Exploitable: remote
Date: 2020-07-27
Bug(s): #722696
ID: 202007-21


A vulnerability in Libreswan could lead to a Denial of Service


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: net-vpn/libreswan
Vulnerable: < 3.32
Unaffected: >= 3.32
Architectures: All supported architectures


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.


An attacker could cause a possible Denial of Service condition.


There is no known workaround at this time.


All Libreswan users should upgrade to the latest version:
# emerge --sync
      # emerge --ask --oneshot --verbose ">=net-vpn/libreswan-3.32"


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