File _patchinfo of Package patchinfo.6668

<patchinfo incident="6668">
  <issue id="1021669" tracker="bnc">CVE-2017-5495: quagga: Telnet interface input buffer allocates unbounded amounts of memory</issue>
  <issue id="1065641" tracker="bnc">CVE-2017-16227: quagga: denial of service via specially crafted BGP UPDATE messages</issue>
  <issue id="1079798" tracker="bnc">CVE-2018-5378: quagga: bgpd bounds check issue via attribute length</issue>
  <issue id="1079799" tracker="bnc">CVE-2018-5379: quagga: bgpd double free when processing UPDATE message</issue>
  <issue id="1079800" tracker="bnc">CVE-2018-5380: quagga: bgpd code-to-string conversion tables overrun</issue>
  <issue id="1079801" tracker="bnc">CVE-2018-5381: quagga: bgpd infinite loop</issue>
  <issue id="2017-5495" tracker="cve" />
  <issue id="2017-16227" tracker="cve" />
  <issue id="2018-5378" tracker="cve" />
  <issue id="2018-5379" tracker="cve" />
  <issue id="2018-5380" tracker="cve" />
  <issue id="2018-5381" tracker="cve" />
  <category>security</category>
  <rating>important</rating>
  <packager>mtomaschewski</packager>
  <description>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, bsc#1065641]

- 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]
</description>
  <summary>Security update for quagga</summary>
</patchinfo>