CVE-2017-5495 Information

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.

CVSS Vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Reference

http://rhn.redhat.com/errata/RHSA-2017-0794.html http://savannah.nongnu.org/forum/forum.php?forum_id=8783 http://www.securityfocus.com/bid/95745 http://www.securitytracker.com/id/1037688 https://github.com/freerangerouting/frr/pull/63 https://lists.quagga.net/pipermail/quagga-dev/2017-January/016586.html

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

HIGH

Base Severity

7.5