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Red Hat: RHSA-2016-2603-02 Moderate: Libreswan DoS Security Update

red hat
Calendar Grey November 3, 2016
Scroller Redhat
OpenSwan has been issued a comprehensive security update that resolves substantial DoS vulnerabilities in CentOS 7.
An update for libreswan is now available for Red Hat Enterprise Linux 7

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

Summary

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.

Topics%20covered

Topics Covered

security advisory Red Hat DoS attack security fix moderate severity IPsec libreswan

References

https://access.redhat.com/security/cve/CVE-2016-5361 https://access.redhat.com/security/updates/classification#moderate https://www.kb.cert.org/vuls/id/419128 https://libreswan.org/security/CVE-2016-5361/CVE-2016-5361.txt https://docs.redhat.com/en/documentation/Red_Hat_Enterprise_Linux/7/html/7.3_Release_Notes/index.html

Package List

Red Hat Enterprise Linux Client (v. 7):
Source: libreswan-3.15-8.el7.src.rpm
x86_64: libreswan-3.15-8.el7.x86_64.rpm libreswan-debuginfo-3.15-8.el7.x86_64.rpm
Red Hat Enterprise Linux Server (v. 7):
Source: libreswan-3.15-8.el7.src.rpm
aarch64: libreswan-3.15-8.el7.aarch64.rpm libreswan-debuginfo-3.15-8.el7.aarch64.rpm
ppc64: libreswan-3.15-8.el7.ppc64.rpm libreswan-debuginfo-3.15-8.el7.ppc64.rpm
ppc64le: libreswan-3.15-8.el7.ppc64le.rpm libreswan-debuginfo-3.15-8.el7.ppc64le.rpm
s390x: libreswan-3.15-8.el7.s390x.rpm libreswan-debuginfo-3.15-8.el7.s390x.rpm
x86_64: libreswan-3.15-8.el7.x86_64.rpm libreswan-debuginfo-3.15-8.el7.x86_64.rpm
Red Hat Enterprise Linux Workstation (v. 7):
Source: libreswan-3.15-8.el7.src.rpm
x86_64: libreswan-3.15-8.el7.x86_64.rpm libreswan-debuginfo-3.15-8.el7.x86_64.rpm
These packages are GPG signed by Red Hat for security. Our key and details on how to verify the signature are available from https://access.redhat.com/security/team/key


Advisory ID: RHSA-2016:2603-02
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2016:2603.html
Issue date: 2016-11-03

Topic

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 impactof Moderate. A Common Vulnerability Scoring System (CVSS) base score, whichgives a detailed severity rating, is available for each vulnerability fromthe CVE link(s) in the References section.

Topics%20covered

Topics Covered

security advisory Red Hat DoS attack security fix moderate severity IPsec libreswan

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

Bugs Fixed

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

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