Debian Security Advisory

DLA-973-1 strongswan -- LTS security update

Date Reported:
01 Jun 2017
Affected Packages:
Security database references:
In Mitre's CVE dictionary: CVE-2017-9022, CVE-2017-9023.
More information:

Two denial of service vulnerabilities were identified in strongSwan, an IKE/IPsec suite, using Google's OSS-Fuzz fuzzing project.

  • CVE-2017-9022

    RSA public keys passed to the gmp plugin aren't validated sufficiently before attempting signature verification, so that invalid input might lead to a floating point exception and crash of the process. A certificate with an appropriately prepared public key sent by a peer could be used for a denial-of-service attack.

  • CVE-2017-9023

    ASN.1 CHOICE types are not correctly handled by the ASN.1 parser when parsing X.509 certificates with extensions that use such types. This could lead to infinite looping of the thread parsing a specifically crafted certificate.

For Debian 7 Wheezy, these problems have been fixed in version 4.5.2-1.5+deb7u9.

We recommend that you upgrade your strongswan packages.

Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: