RHSA-2006:0661 - Security Advisory

Topic

Updated OpenSSL packages are now available to correct a security issue.

This update has been rated as having important security impact by the Red
Hat Security Response Team.

Description

The OpenSSL toolkit provides support for secure communications between
machines. OpenSSL includes a certificate management tool and shared
libraries which provide various cryptographic algorithms and protocols.

Daniel Bleichenbacher recently described an attack on PKCS #1 v1.5
signatures. Where an RSA key with exponent 3 is used it may be possible
for an attacker to forge a PKCS #1 v1.5 signature that would be incorrectly
verified by implementations that do not check for excess data in the RSA
exponentiation result of the signature.

The Google Security Team discovered that OpenSSL is vulnerable to this
attack. This issue affects applications that use OpenSSL to verify X.509
certificates as well as other uses of PKCS #1 v1.5. (CVE-2006-4339)

This errata also resolves a problem where a customized ca-bundle.crt file
was overwritten when the openssl package was upgraded.

Users are advised to upgrade to these updated packages, which contain a
backported patch to correct this issue.

Note: After installing this update, users are advised to either restart all
services that use OpenSSL or restart their system.

Solution

Users of Red Hat Enterprise Linux 2.1 may need to use the command "up2date
openssl openssl095a openssl096" to install these updated packages on their
systems. This is due to a conflict between Galeon and the recent Seamonkey
update. We will provide updated Galeon packages to fix this conflict in
a future erratum.

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

This update is available via Red Hat Network. To use Red Hat Network,
launch the Red Hat Update Agent with the following command:

up2date

This will start an interactive process that will result in the appropriate
RPMs being upgraded on your system.

Affected Products

• Red Hat Enterprise Linux Server 4 x86_64
• Red Hat Enterprise Linux Server 4 ia64
• Red Hat Enterprise Linux Server 4 i386
• Red Hat Enterprise Linux Server 3 x86_64
• Red Hat Enterprise Linux Server 3 ia64
• Red Hat Enterprise Linux Server 3 i386
• Red Hat Enterprise Linux Server 2 ia64
• Red Hat Enterprise Linux Server 2 i386
• Red Hat Enterprise Linux Workstation 4 x86_64
• Red Hat Enterprise Linux Workstation 4 ia64
• Red Hat Enterprise Linux Workstation 4 i386
• Red Hat Enterprise Linux Workstation 3 x86_64
• Red Hat Enterprise Linux Workstation 3 ia64
• Red Hat Enterprise Linux Workstation 3 i386
• Red Hat Enterprise Linux Workstation 2 ia64
• Red Hat Enterprise Linux Workstation 2 i386
• Red Hat Enterprise Linux Desktop 4 x86_64
• Red Hat Enterprise Linux Desktop 4 i386
• Red Hat Enterprise Linux Desktop 3 x86_64
• Red Hat Enterprise Linux Desktop 3 i386
• Red Hat Enterprise Linux for IBM z Systems 4 s390x
• Red Hat Enterprise Linux for IBM z Systems 4 s390
• Red Hat Enterprise Linux for IBM z Systems 3 s390x
• Red Hat Enterprise Linux for IBM z Systems 3 s390
• Red Hat Enterprise Linux for Power, big endian 4 ppc
• Red Hat Enterprise Linux for Power, big endian 3 ppc

Fixes

• BZ - 170740 - Custom ca-bundle.crt overwritten on upgrade
• BZ - 175811 - Custom ca-bundle.crt overwritten on upgrade
• BZ - 205180 - CVE-2006-4339 RSA signature forgery

CVEs

• CVE-2006-4339

References

• http://www.imc.org/ietf-openpgp/mail-archive/msg14307.html
• http://www.openssl.org/news/secadv_20060905.txt
• http://www.redhat.com/security/updates/classification/#important