RHBA-2013:0028 - Bug Fix Advisory

Topic

Updated gnutls packages that fix three bugs are now available for Red Hat
Enterprise Linux 5.

Description

The gnutls packages provides the GNU Transport Layer Security (GnuTLS) library,
which provides a secure layer over a transport layer using protocols such as
TLS, SSL, and DTLS.

This update fixes the following bugs:

• The gnutls packages reported wrong distinguished names (DNs) for chain CA

certificates used for the client authentication; the issuer DN was reported
instead of the subject DN. As a consequence, the TLS clients were not able to
provide a client certificate signed by a chain CA certificate when connecting to
a gnutls TLS server. The underlying source code has been modified and gnutls now
reports the right DN and the TLS clients work as expected in the described
scenario. (BZ#592112)

• Previously, in the certool utility was a missing check used for an empty

string when a challenge password was entered. Consequently, certificate requests
generated by certtool were sometimes invalid when an empty challenge password
was used. This missing empty-string check has been added and now the certtool's
certificate requests are valid even if the challenge password is not entered.
(BZ#730816)

• Under certain circumstances, a null pointer could be dereferenced in the

GnuTLS library. This caused TLS clients, such as the rsyslog utility, to
terminate unexpectedly with a segmentation fault. This update adds a test
condition ensuring that null pointers can no longer be dereferenced and TLS
clients no longer crash. (BZ#785001)

All users of gnutls are advised to upgrade to these updated packages, which fix
these bugs.

Solution

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

This update is available via the Red Hat Network. Details on how to
use the Red Hat Network to apply this update are available at
https://access.redhat.com/knowledge/articles/11258

Affected Products

• Red Hat Enterprise Linux Server 5 x86_64
• Red Hat Enterprise Linux Server 5 ia64
• Red Hat Enterprise Linux Server 5 i386
• Red Hat Enterprise Linux Workstation 5 x86_64
• Red Hat Enterprise Linux Workstation 5 i386
• Red Hat Enterprise Linux Desktop 5 x86_64
• Red Hat Enterprise Linux Desktop 5 i386
• Red Hat Enterprise Linux for IBM z Systems 5 s390x
• Red Hat Enterprise Linux for Power, big endian 5 ppc
• Red Hat Enterprise Linux Server from RHUI 5 x86_64
• Red Hat Enterprise Linux Server from RHUI 5 i386

Fixes

CVEs

(none)

References

(none)