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[security-announce] SUSE-SU-2018:0455-1: important: Security update for quagga
SUSE Security Update: Security update for quagga

Announcement ID: SUSE-SU-2018:0455-1
Rating: important
References: #1021669 #1065641 #1079798 #1079799 #1079800
Cross-References: CVE-2017-16227 CVE-2017-5495 CVE-2018-5378
CVE-2018-5379 CVE-2018-5380 CVE-2018-5381

Affected Products:
SUSE OpenStack Cloud 6
SUSE Linux Enterprise Server for SAP 12-SP1
SUSE Linux Enterprise Server 12-SP1-LTSS
SUSE Linux Enterprise Server 12-LTSS

An update that fixes 6 vulnerabilities is now available.


This update for quagga fixes the following security issues:

- The Quagga BGP daemon contained a bug in the AS_PATH size calculation
that could have been exploited to facilitate a remote denial-of-service
attack via specially crafted BGP UPDATE messages. [CVE-2017-16227,

- The Quagga BGP daemon did not check whether data sent to peers via
NOTIFY had an invalid attribute length. It was possible to exploit this
issue and cause the bgpd process to leak sensitive information over the
network to a configured peer. [CVE-2018-5378, bsc#1079798]

- The Quagga BGP daemon used to double-free memory when processing certain
forms of UPDATE messages. This issue could be exploited by sending an
optional/transitive UPDATE attribute that all conforming eBGP speakers
should pass along. Consequently, a single UPDATE message could have
affected many bgpd processes across a wide area of a network. Through
this vulnerability, attackers could potentially have taken over control
of affected bgpd processes remotely. [CVE-2018-5379, bsc#1079799]

- It was possible to overrun internal BGP code-to-string conversion tables
in the Quagga BGP daemon. Configured peers could have exploited this
issue and cause bgpd to emit debug and warning messages into the logs
that would contained arbitrary bytes. [CVE-2018-5380, bsc#1079800]

- The Quagga BGP daemon could have entered an infinite loop if sent an
invalid OPEN message by a configured peer. If this issue was exploited,
then bgpd would cease to respond to any other events. BGP sessions would
have been dropped and not be reestablished. The CLI interface would have
been unresponsive. The bgpd daemon would have stayed in this state until
restarted. [CVE-2018-5381, bsc#1079801]

- The Quagga daemon's telnet "vty" CLI contains an unbounded memory
allocation bug that could be exploited for a denial-of-service attack on
the daemon. This issue has been fixed. [CVE-2017-5495, bsc#1021669]

- The telnet "vty" CLI of the Quagga daemon is no longer enabled by
default, because the passwords in the default "zebra.conf" config file
are now disabled. The vty interface is available via "vtysh" utility
using pam authentication to permit management access for root without
password. [bsc#1021669]

Patch Instructions:

To install this SUSE Security Update use YaST online_update.
Alternatively you can run the command listed for your product:

- SUSE OpenStack Cloud 6:

zypper in -t patch SUSE-OpenStack-Cloud-6-2018-315=1

- SUSE Linux Enterprise Server for SAP 12-SP1:

zypper in -t patch SUSE-SLE-SAP-12-SP1-2018-315=1

- SUSE Linux Enterprise Server 12-SP1-LTSS:

zypper in -t patch SUSE-SLE-SERVER-12-SP1-2018-315=1

- SUSE Linux Enterprise Server 12-LTSS:

zypper in -t patch SUSE-SLE-SERVER-12-2018-315=1

To bring your system up-to-date, use "zypper patch".

Package List:

- SUSE OpenStack Cloud 6 (x86_64):


- SUSE Linux Enterprise Server for SAP 12-SP1 (ppc64le x86_64):


- SUSE Linux Enterprise Server 12-SP1-LTSS (ppc64le s390x x86_64):


- SUSE Linux Enterprise Server 12-LTSS (ppc64le s390x x86_64):



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