ESB-2018.0488 - [SUSE] quagga: Multiple vulnerabilities 2018-02-19

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             AUSCERT External Security Bulletin Redistribution

                          quagga security updates
                             19 February 2018


        AusCERT Security Bulletin Summary

Product:           quagga
Publisher:         SUSE
Operating System:  SUSE
Impact/Access:     Execute Arbitrary Code/Commands -- Existing Account
                   Denial of Service               -- Existing Account
                   Access Confidential Data        -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-5381 CVE-2018-5380 CVE-2018-5379
                   CVE-2018-5378 CVE-2017-16227 CVE-2017-5495

Reference:         ESB-2017.2163

Original Bulletin:

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   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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