PublicDateAtUSN: 2017-01-24
Candidate: CVE-2017-5495
PublicDate: 2017-01-24 07:59:00 UTC
References:
 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-5495
 http://savannah.nongnu.org/forum/forum.php?forum_id=8783
 http://mirror.easyname.at/nongnu//quagga/quagga-1.1.1.changelog.txt
 https://github.com/freerangerouting/frr/pull/63
 https://ubuntu.com/security/notices/USN-3471-1
Description:
 All versions of Quagga, 0.93 through 1.1.0, are vulnerable to an unbounded
 memory allocation in the telnet 'vty' CLI, leading to a Denial-of-Service
 of Quagga daemons, or even the entire host. When Quagga daemons are
 configured with their telnet CLI enabled, anyone who can connect to the TCP
 ports can trigger this vulnerability, prior to authentication. Most
 distributions restrict the Quagga telnet interface to local access only by
 default. The Quagga telnet interface 'vty' input buffer grows
 automatically, without bound, so long as a newline is not entered. This
 allows an attacker to cause the Quagga daemon to allocate unbounded memory
 by sending very long strings without a newline. Eventually the daemon is
 terminated by the system, or the system itself runs out of memory. This is
 fixed in Quagga 1.1.1 and Free Range Routing (FRR) Protocol Suite
 2017-01-10.
Ubuntu-Description:
Notes:
 tyhicks> The telnet 'vty' CLI is not configured to listen for remote
  connections by default
Bugs:
 http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=852454
Priority: low
Discovered-by: Quentin Young
Assigned-to: mdeslaur
CVSS:
 nvd: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H [7.5 HIGH]

Patches_quagga:
 upstream: http://git.savannah.gnu.org/cgit/quagga.git/commit/?id=b7ceefea77a246fe5c1dcd1b91bf6079d1b97c02
 upstream: http://git.savannah.gnu.org/cgit/quagga.git/commit/?id=7d66284a5817a1613b1e4d64a0775ec04fdf8c01
upstream_quagga: released (1.1.1)
precise_quagga: ignored (reached end-of-life)
precise/esm_quagga: DNE (precise was needed)
trusty_quagga: released (0.99.22.4-3ubuntu1.4)
trusty/esm_quagga: DNE (trusty was released [0.99.22.4-3ubuntu1.4])
vivid/stable-phone-overlay_quagga: DNE
vivid/ubuntu-core_quagga: DNE
xenial_quagga: released (0.99.24.1-2ubuntu1.3)
esm-infra/xenial_quagga: released (0.99.24.1-2ubuntu1.3)
yakkety_quagga: ignored (reached end-of-life)
zesty_quagga: not-affected (1.1.1-1)
artful_quagga: not-affected (1.1.1-3)
devel_quagga: not-affected (1.1.1-3)