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CVE-2017-5495

Published: 24 January 2017

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.

Notes

AuthorNote
tyhicks
The telnet 'vty' CLI is not configured to listen for remote
connections by default

Priority

Low

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
quagga
Launchpad, Ubuntu, Debian
artful Not vulnerable
(1.1.1-3)
precise Ignored
(end of life)
trusty
Released (0.99.22.4-3ubuntu1.4)
upstream
Released (1.1.1)
xenial
Released (0.99.24.1-2ubuntu1.3)
yakkety Ignored
(end of life)
zesty Not vulnerable
(1.1.1-1)
Patches:
upstream: http://git.savannah.gnu.org/cgit/quagga.git/commit/?id=b7ceefea77a246fe5c1dcd1b91bf6079d1b97c02
upstream: http://git.savannah.gnu.org/cgit/quagga.git/commit/?id=7d66284a5817a1613b1e4d64a0775ec04fdf8c01

Severity score breakdown

Parameter Value
Base score 7.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H