RHBA-2015:1307 - Bug Fix Advisory

Topic

Updated netcf packages that fix several bugs are now available for Red Hat
Enterprise Linux 6.

Description

The netcf packages contain a library for modifying the network configuration of
a system. Network configuration is expressed in a platform-independent XML
format, which netcf translates into changes to the system's "native" network
configuration files.

This update fixes the following bugs:

• Previously, when the XML configuration for an interface enabled dynamic host

configuration protocol (DHCP) for IPv6, the netcf library erroneously set the
variable named "DHCPV6" in the ifcfg configuration file instead of "DHCPV6C".
The underlying source code has been patched, and netcf now passes the correct
"DHCPV6C" option to ifcfg. (BZ#1113978)

• Prior to this update, when requested to configure an interface with an IPv4

netmask of 255.255.255.255, the netcf library logged an error as the
interface configuration was rejected. This update fixes the netmask for the
32-bit interface prefix, and netcf now configures IPv4 interfaces successfully.
(BZ#1116314)

• Due to a parsing error, the ifcfg files with comments starting anywhere beyond

column 1 or multiple variables on a single line caused the netcf library to
generate errors when attempting to list host interfaces. The parsing error has
been fixed, and any tool using netcf now lists active interfaces as expected.
(BZ#1208897)

• When multiple static IPv6 addresses were specified in an interface

configuration, an extra set of quotes appeared in the IPV6ADDR_SECONDARIES entry
in the generated configuration file. This update removes extraneous single
quotes from IPV6ADDR_SECONDARIES, thus fixing this bug. (BZ#1208894)

• Due to a denial of a service flaw in the netcf library, a specially crafted

interface name previously caused applications using netcf, such as the libvirt
daemon, to terminate unexpectedly. An upstream patch has been applied to fix
this bug, and applications using netcf no longer crash in the aforementioned
situation. (BZ#1165966)

Users of netcf 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.

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

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

Affected Products

• Red Hat Enterprise Linux Server 6 x86_64
• Red Hat Enterprise Linux Server 6 i386
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 6 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 6 i386
• Red Hat Enterprise Linux Workstation 6 x86_64
• Red Hat Enterprise Linux Workstation 6 i386
• Red Hat Enterprise Linux Desktop 6 x86_64
• Red Hat Enterprise Linux Desktop 6 i386
• Red Hat Enterprise Linux for IBM z Systems 6 s390x
• Red Hat Enterprise Linux for Power, big endian 6 ppc64
• Red Hat Enterprise Linux for Scientific Computing 6 x86_64
• Red Hat Enterprise Linux Server from RHUI 6 x86_64
• Red Hat Enterprise Linux Server from RHUI 6 i386
• Red Hat Enterprise Linux Server - Extended Life Cycle Support (for IBM z Systems) 6 s390x

Fixes

• BZ - 1113978 - netcf should emit DHCPV6C to ifcfg-* files for ipv6 family rather than "DHCPV6"
• BZ - 1116314 - netcf can not generate all-ones netmask on a interface
• BZ - 1208894 - Remove extraneous single quotes from IPV6ADDR_SECONDARIES
• BZ - 1208897 - Bad parsing of network-scripts/ifcfg-xxxx files.

CVEs

(none)

References

(none)