[RHSA-2015:1154-01] Moderate: libreswan security, bug fix and enhancement update

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Red Hat Security Advisory

 

Synopsis: Moderate: libreswan security, bug fix and enhancement update

Advisory ID: RHSA-2015:1154-01

Product: Red Hat Enterprise Linux

Advisory URL: https://rhn.redhat.com/errata/RHSA-2015-1154.html

Issue date: 2015-06-23

CVE Names: CVE-2015-3204

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1. Summary:

 

Updated libreswan packages that fix one security issue, several bugs and

add two enhancements are now available for Red Hat Enterprise Linux 7.

 

Red Hat Product Security has rated this update as having Moderate security

impact. A Common Vulnerability Scoring System (CVSS) base score, which

gives a detailed severity rating, is available from the CVE link in the

References section.

 

2. Relevant releases/architectures:

 

Red Hat Enterprise Linux Client (v. 7) - x86_64

Red Hat Enterprise Linux Server (v. 7) - 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).

 

A flaw was discovered in the way Libreswan's IKE daemon processed certain

IKEv1 payloads. A remote attacker could send specially crafted IKEv1

payloads that, when processed, would lead to a denial of service (daemon

crash). (CVE-2015-3204)

 

Red Hat would like to thank Javantea for reporting this issue.

 

This update fixes the following bugs:

 

* Previously, the programs/pluto/state.h and

programs/pluto/kernel_netlink.c files had a maximum SELinux context size

of 257 and 1024 respectively. These restrictions set by libreswan limited

the size of the context that can be exchanged by pluto (the IPSec daemon)

when using a Labeled Internet Protocol Security (IPsec). The SElinux

labels for Labeled IPsec have been extended to 4096 bytes and the

mentioned restrictions no longer exist. (BZ#1198650)

 

* On some architectures, the kernel AES_GCM IPsec algorithm did not work

properly with acceleration drivers. On those kernels, some acceleration

modules are added to the modprobe blacklist. However, Libreswan was

ignoring this blacklist, leading to AES_GCM failures. This update adds

support for the module blacklist to the libreswan packages and thus

prevents the AES_GCM failures from occurring. (BZ#1208022)

 

* An IPv6 issue has been resolved that prevented ipv6-icmp Neighbour

Discovery from working properly once an IPsec tunnel is established (and

one endpoint reboots). When upgrading, ensure that /etc/ipsec.conf is

loading all /etc/ipsec.d/*conf files using the /etc/ipsec.conf "include"

statement, or explicitly include this new configuration file in

/etc/ipsec.conf. (BZ#1208023)

 

* A FIPS self-test prevented libreswan from properly starting in FIPS mode.

This bug has been fixed and libreswan now works in FIPS mode as expected.

(BZ#1211146)

 

In addition, this update adds the following enhancements:

 

* A new option "seedbits=" has been added to pre-seed the Network Security

Services (NSS) pseudo random number generator (PRNG) function with entropy

from the /dev/random file on startup. This option is disabled by default.

It can be enabled by setting the "seedbits=" option in the "config setup"

section in the /etc/ipsec.conf file. (BZ#1198649)

 

* The build process now runs a Cryptographic Algorithm Validation Program

(CAVP) certification test on the Internet Key Exchange version 1 and 2

(IKEv1 and IKEv2) PRF/PRF+ functions. (BZ#1213652)

 

All libreswan users are advised to upgrade to these updated packages,

which contain backported patches to correct these issues and add these

enhancements.

 

4. Solution:

 

Before applying this update, make sure all previously released errata

relevant to your system have been applied.

 

For details on how to apply this update, refer to:

 

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

 

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

 

1223361 - CVE-2015-3204 libreswan: crafted IKE packet causes daemon restart

 

6. Package List:

 

Red Hat Enterprise Linux Client (v. 7):

 

Source:

libreswan-3.12-10.1.el7_1.src.rpm

 

x86_64:

libreswan-3.12-10.1.el7_1.x86_64.rpm

libreswan-debuginfo-3.12-10.1.el7_1.x86_64.rpm

 

Red Hat Enterprise Linux Server (v. 7):

 

Source:

libreswan-3.12-10.1.el7_1.src.rpm

 

ppc64:

libreswan-3.12-10.1.el7_1.ppc64.rpm

libreswan-debuginfo-3.12-10.1.el7_1.ppc64.rpm

 

s390x:

libreswan-3.12-10.1.el7_1.s390x.rpm

libreswan-debuginfo-3.12-10.1.el7_1.s390x.rpm

 

x86_64:

libreswan-3.12-10.1.el7_1.x86_64.rpm

libreswan-debuginfo-3.12-10.1.el7_1.x86_64.rpm

 

Red Hat Enterprise Linux Server (v. 7):

 

Source:

libreswan-3.12-10.1.ael7b_1.src.rpm

 

ppc64le:

libreswan-3.12-10.1.ael7b_1.ppc64le.rpm

libreswan-debuginfo-3.12-10.1.ael7b_1.ppc64le.rpm

 

Red Hat Enterprise Linux Workstation (v. 7):

 

Source:

libreswan-3.12-10.1.el7_1.src.rpm

 

x86_64:

libreswan-3.12-10.1.el7_1.x86_64.rpm

libreswan-debuginfo-3.12-10.1.el7_1.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/

 

7. References:

 

https://access.redhat.com/security/cve/CVE-2015-3204

https://access.redhat.com/security/updates/classification/#moderate

https://libreswan.org/security/CVE-2015-3204/CVE-2015-3204.txt

 

8. Contact:

 

The Red Hat security contact is . More contact

details at https://access.redhat.com/security/team/contact/

 

Copyright 2015 Red Hat, Inc.

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