5 - RHSA-2016:2603

Problem Description:

An update for libreswan is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Client (v. 7) - x86_64 Red Hat Enterprise Linux Server (v. 7) - aarch64, ppc64, ppc64le, s390x, x86_64 Red Hat Enterprise Linux Workstation (v. 7) - x86_64

3. Description:

Libreswan is an implementation of IPsec & IKE for Linux. IPsec is the Internet Protocol Security and uses strong cryptography to provide both authentication and encryption services. These services allow you to build secure tunnels through untrusted networks such as virtual private network (VPN).

Security Fix(es):

* A traffic amplification flaw was found in the Internet Key Exchange version 1 (IKEv1) protocol. A remote attacker could use a libreswan server with IKEv1 enabled in a network traffic amplification denial of service attack against other hosts on the network by sending UDP packets with a spoofed source address to that server. (CVE-2016-5361)

Additional Changes:

For detailed information on changes in this release, see the Red Hat Enterprise Linux 7.3 Release Notes linked from the References section.

4. Solution:

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

5. Bugs fixed (https://bugzilla.redhat.com/):

1190526 - ipsec auto --listcrls doesn't show crls 1219049 - Pluto does not handle delete message from responder site in ikev1 1229766 - Pluto crashes after stop when I use floating ip address 1257079 - Libreswan doesn't call NetworkManager helper in case of a connection error 1271811 - libreswan FIPS test mistakenly looks for non-existent file hashes and reports FIPS failure 1272112 - ipsec whack man page discrepancies 1278063 - Unable to authenticate with PAM for IKEv1 XAUTH 1280449 - PAM xauth method does not work with pam_sss 1283468 - keyingtries=0 is broken - meaning it is interpreted as keyingtries=1 1290907 - ipsec initnss/checknss custom directory not recognized 1297816 - When using SHA2 as PRF algorithm, the nonce payload is below the RFC required minimum size 1308508 - CVE-2016-5361 IKEv1 protocol is vulnerable to DoS amplification attack 1309764 - ipsec barf does not show pluto log correctly in the output 1313747 - ipsec pluto returns zero even if it fails 1315412 - ipsec.conf manpage does not contain any mention about crl-strict option 1347735 - libreswan needs to check additional CRLs after LDAP CRL distributionpoint fails