RHSA-2015:1979 - Security Advisory

Topic

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

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 IKE KE
payloads. A remote attacker could send specially crafted IKE payload with a
KE payload of g^x=0 that, when processed, would lead to a denial of service
(daemon crash). (CVE-2015-3240)

This issue was discovered by Paul Wouters of Red Hat.

Note: Please note that when upgrading from an earlier version of Libreswan,
the existing CA certificates in the /etc/ipsec.d/cacerts/ directory and the
existing certificate revocation list (CRL) files from the
/etc/ipsec.d/crls/ directory are automatically imported into the NSS
database. Once completed, these directories are no longer used by
Libreswan. To install new CA certificates or new CRLS, the certutil and
crlutil commands must be used to import these directly into the Network
Security Services (NSS) database.

This update also adds the following enhancements:

• This update adds support for RFC 7383 IKEv2 Fragmentation, RFC 7619 Auth

Null and ID Null, INVALID_KE renegotiation, CRL and OCSP support via NSS,
AES_CTR and AES_GCM support for IKEv2, CAVS testing for FIPS compliance.

In addition, this update enforces FIPS algorithms restrictions in FIPS
mode, and runs Composite Application Validation System (CAVS) testing for
FIPS compliance during package build. A new Cryptographic Algorithm
Validation Program (CAVP) binary can be used to re-run the CAVS tests at
any time. Regardless of FIPS mode, the pluto daemon runs RFC test vectors
for various algorithms.

Furthermore, compiling on all architectures now enables the "-Werror" GCC
option, which enhances the security by making all warnings into errors.
(BZ#1263346)

• This update also fixes several memory leaks and introduces a sub-second

packet retransmit option. (BZ#1268773)

• This update improves migration support from Openswan to Libreswan.

Specifically, all Openswan options that can take a time value without a
suffix are now supported, and several new keywords for use in the
/etc/ipsec.conf file have been introduced. See the relevant man pages for
details. (BZ#1268775)

• With this update, loopback support via the "loopback=" option has been

deprecated. (BZ#1270673)

All Libreswan users are advised to upgrade to these updated packages, which
contain backported patches to correct these issues and add these
enhancements.

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

Affected Products

• Red Hat Enterprise Linux Server 7 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 7.7 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 7.6 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 7.5 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 7.4 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 7.3 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 7.2 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 7.1 x86_64
• Red Hat Enterprise Linux Server - AUS 7.7 x86_64
• Red Hat Enterprise Linux Server - AUS 7.6 x86_64
• Red Hat Enterprise Linux Server - AUS 7.4 x86_64
• Red Hat Enterprise Linux Server - AUS 7.3 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 7 x86_64
• Red Hat Enterprise Linux Workstation 7 x86_64
• Red Hat Enterprise Linux Desktop 7 x86_64
• Red Hat Enterprise Linux for IBM z Systems 7 s390x
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 7.7 s390x
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 7.6 s390x
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 7.5 s390x
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 7.4 s390x
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 7.3 s390x
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 7.2 s390x
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 7.1 s390x
• Red Hat Enterprise Linux for Power, big endian 7 ppc64
• Red Hat Enterprise Linux for Power, big endian - Extended Update Support 7.7 ppc64
• Red Hat Enterprise Linux for Power, big endian - Extended Update Support 7.6 ppc64
• Red Hat Enterprise Linux for Power, big endian - Extended Update Support 7.5 ppc64
• Red Hat Enterprise Linux for Power, big endian - Extended Update Support 7.4 ppc64
• Red Hat Enterprise Linux for Power, big endian - Extended Update Support 7.3 ppc64
• Red Hat Enterprise Linux for Power, big endian - Extended Update Support 7.2 ppc64
• Red Hat Enterprise Linux for Power, big endian - Extended Update Support 7.1 ppc64
• Red Hat Enterprise Linux Server from RHUI 7 x86_64
• Red Hat Enterprise Linux for Power, little endian 7 ppc64le
• Red Hat Enterprise Linux for Power, little endian - Extended Update Support 7.7 ppc64le
• Red Hat Enterprise Linux for Power, little endian - Extended Update Support 7.6 ppc64le
• Red Hat Enterprise Linux for Power, little endian - Extended Update Support 7.5 ppc64le
• Red Hat Enterprise Linux for Power, little endian - Extended Update Support 7.4 ppc64le
• Red Hat Enterprise Linux for Power, little endian - Extended Update Support 7.3 ppc64le
• Red Hat Enterprise Linux for Power, little endian - Extended Update Support 7.2 ppc64le
• Red Hat Enterprise Linux for Power, little endian - Extended Update Support 7.1 ppc64le
• Red Hat Enterprise Linux Server - TUS 7.7 x86_64
• Red Hat Enterprise Linux Server - TUS 7.6 x86_64
• Red Hat Enterprise Linux Server - TUS 7.3 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support (for IBM z Systems) 7 s390x
• Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 7.7 ppc64le
• Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 7.6 ppc64le
• Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 7.4 ppc64le
• Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 7.3 ppc64le
• Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 7.7 x86_64
• Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 7.6 x86_64
• Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 7.4 x86_64
• Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 7.3 x86_64
• Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 7.2 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support for IBM Power, big endian 7 ppc64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support for IBM Power, little endian 7 ppc64le

Fixes

• BZ - 1232320 - CVE-2015-3240 libreswan / openswan: denial of service via IKE daemon restart when receiving a bad DH gx value
• BZ - 1268775 - libreswan should support strictcrlpolicy alias for crl-strict= option to support openswan migration
• BZ - 1273719 - libreswan FIPS test mistakenly looks for non-existent file hashes and reports FIPS failure

CVEs

• CVE-2015-3240

References

• http://www.redhat.com/security/updates/classification/#normal