RHSA-2015:2315 - Security Advisory

Topic

Updated NetworkManager packages that fix two security issues, several bugs,
and add various enhancements are now available for Red Hat Enterprise
Linux 7.

Red Hat Product Security has rated this update as having Moderate security
impact. Common Vulnerability Scoring System (CVSS) base scores, which give
detailed severity ratings, are available for each vulnerability from the
CVE links in the References section.

Description

NetworkManager is a system network service that manages network devices
and connections.

It was discovered that NetworkManager would set device MTUs based on MTU
values received in IPv6 RAs (Router Advertisements), without sanity
checking the MTU value first. A remote attacker could exploit this flaw to
create a denial of service attack, by sending a specially crafted IPv6 RA
packet to disturb IPv6 communication. (CVE-2015-0272)

A flaw was found in the way NetworkManager handled router advertisements.
An unprivileged user on a local network could use IPv6 Neighbor Discovery
ICMP to broadcast a non-route with a low hop limit, causing machines to
lower the hop limit on existing IPv6 routes. If this limit is small enough,
IPv6 packets would be dropped before reaching the final destination.
(CVE-2015-2924)

The network-manager-applet and NetworkManager-libreswan packages have been
upgraded to upstream versions 1.0.6, and provide a number of bug fixes and
enhancements over the previous versions. (BZ#1177582, BZ#1243057)

Bugs:

• It was not previously possible to set the Wi-Fi band to the "a" or "bg"

values to lock to a specific frequency band. NetworkManager has been fixed,
and it now sets the wpa_supplicant's "freq_list" option correctly, which
enables proper Wi-Fi band locking. (BZ#1254461)

• NetworkManager immediately failed activation of devices that did not have

a carrier early in the boot process. The legacy network.service then
reported activation failure. Now, NetworkManager has a grace period during
which it waits for the carrier to appear. Devices that have a carrier down
for a short time on system startup no longer cause the legacy
network.service to fail. (BZ#1079353)

• NetworkManager brought down a team device if the teamd service managing

it exited unexpectedly, and the team device was deactivated. Now,
NetworkManager respawns the teamd instances that disappear and is able to
recover from a teamd failure avoiding disruption of the team device
operation. (BZ#1145988)

• NetworkManager did not send the FQDN DHCP option even if host name was

set to FQDN. Consequently, Dynamic DNS (DDNS) setups failed to update the
DNS records for clients running NetworkManager. Now, NetworkManager sends
the FQDN option with DHCP requests, and the DHCP server is able to create
DNS records for such clients. (BZ#1212597)

• The command-line client was not validating the vlan.flags property

correctly, and a spurious warning message was displayed when the nmcli tool
worked with VLAN connections. The validation routine has been fixed, and
the warning message no longer appears. (BZ#1244048)

• NetworkManager did not propagate a media access control (MAC) address

change from a bonding interface to a VLAN interface on top of it.
Consequently, a VLAN interface on top of a bond used an incorrect MAC
address. Now, NetworkManager synchronizes the addresses correctly.
(BZ#1264322)

Enhancements:

• IPv6 Privacy extensions are now enabled by default. NetworkManager checks

the per-network configuration files, NetworkManager.conf, and then falls
back to "/proc/sys/net/ipv6/conf/default/use_tempaddr" to determine and set
IPv6 privacy settings at device activation. (BZ#1187525)

• The NetworkManager command-line tool, nmcli, now allows setting the

wake-on-lan property to 0 ("none", "disable", "disabled"). (BZ#1260584)

• NetworkManager now provides information about metered connections.

(BZ#1200452)

• NetworkManager daemon and the connection editor now support setting the

Maximum Transmission Unit (MTU) of a bond. It is now possible to change MTU
of a bond interface in a GUI. (BZ#1177582, BZ#1177860)

• NetworkManager daemon and the connection editor now support setting the

MTU of a team, allowing to change MTU of a teaming interface. (BZ#1255927)

NetworkManager users are advised to upgrade to these updated packages,
which 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 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 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 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 Scientific Computing 7 x86_64
• Red Hat Enterprise Linux Server from RHUI 7 x86_64
• Red Hat Enterprise Linux EUS Compute Node 7.7 x86_64
• Red Hat Enterprise Linux EUS Compute Node 7.6 x86_64
• Red Hat Enterprise Linux EUS Compute Node 7.5 x86_64
• Red Hat Enterprise Linux EUS Compute Node 7.4 x86_64
• Red Hat Enterprise Linux EUS Compute Node 7.3 x86_64
• Red Hat Enterprise Linux Server - AUS 7.3 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 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 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

Fixes

• BZ - 918692 - PIN/Password dialog for Mobile Broadband forces user to enter password, even if it's not needed
• BZ - 1062301 - NetworkManager should provide a way to reload a configuration and to refresh resolv.conf if necessary
• BZ - 1139536 - [RFE] Improve handling of DEVICE and HWADDR in nm-connection-editor
• BZ - 1141417 - Persistent wake on lan across reboot
• BZ - 1168388 - veth device goes down when ipv4 dhcp lease expires
• BZ - 1168657 - nmcli hangs when deleting profile two times
• BZ - 1182575 - [nmcli] Can't add certificate blob via nmcli as description states
• BZ - 1183015 - ipv6.method shared prevents connection from being upped
• BZ - 1183444 - Attaching a team device to a bridge doesn't work.
• BZ - 1187525 - Enable privacy extensions by default
• BZ - 1192132 - CVE-2015-0272 NetworkManager: remote DoS using IPv6 RA with bogus MTU
• BZ - 1200451 - feature request: Indicate 2ghz and 5ghz wifi device capabilities
• BZ - 1200452 - feature request: provide information about metered connections
• BZ - 1201497 - [PATCH] fix a configure-and-quit=yes bug when DHCP client ID is set and hostname is not given
• BZ - 1207730 - Continuous IPv6 router solicitation loop
• BZ - 1209902 - CVE-2015-2924 NetworkManager: denial of service (DoS) attack against IPv6 network stacks due to improper handling of Router Advertisements
• BZ - 1211133 - high cpu use with many IPv6 cloned routes
• BZ - 1211859 - _nl_get_vtable: assertion 'vtable.handle' failed
• BZ - 1229471 - [bluez5] add DUN support to nm-connection-editor
• BZ - 1238840 - libreswan vpn is not working
• BZ - 1243057 - Update to NetworkManager-openswan/libreswan 1.0.6 or later
• BZ - 1244293 - NetworkManager support for secondary IPv6 addresses
• BZ - 1246496 - dhclient is terminated and won't start after restart NetworkManager
• BZ - 1250019 - NetworkManager doesn't handle MTU correctly
• BZ - 1250723 - Updating IPv4 address lifetime causes VPN disconnection
• BZ - 1251954 - Can activate a DUN connection only once
• BZ - 1253744 - segfault while trying to connect to VPN
• BZ - 1254089 - Netlink error at 'link_change' function when net interface dynamic plug out and plug in on Xen
• BZ - 1254461 - Wi-Fi band-locking doesn't work
• BZ - 1255735 - Dialog run by nm-connection-editor --create --type=vlan doesn't offer connections (eg bond) as parents
• BZ - 1256772 - NetworkManager quits prematurely with "configure-and-quit"
• BZ - 1261428 - ipv6 dns set even if ipv6.ignore-auto-dns set yes
• BZ - 1264024 - no network on xen guests: Error: Connection activation failed: No suitable device found for this connection.
• BZ - 1264089 - cannot add adsl type connection
• BZ - 1264361 - backport upstream bugfix to platform handling links in different netns (IFLA_LINK_NETNSID)
• BZ - 1267326 - libnm-gtk: fix a possible crash in functions handling password entry
• BZ - 1267330 - libnm-gtk: remove underscore from tooltip and use symbolic icons for password location icons
• BZ - 1267462 - NetworkManager segfault on_bss_proxy_acquired
• BZ - 1267672 - fix crash in nmtui when requesting password
• BZ - 1268030 - 20 seconds timeout is not sufficient for VPN password entry
• BZ - 1271973 - no more vpn dialog after previous canceling
• BZ - 1272023 - vpn password request still visible after timeout (3 mins)
• BZ - 1272974 - Fix regression detecting s390 CTC devices

CVEs

• CVE-2015-0272
• CVE-2015-2924

References

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