CVE-2017-5495

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.

How to fix CVE-2017-5495

To remediate CVE-2017-5495, upgrade the affected package to a fixed version below.

• —upgrade to 1.1.1-r0 or later

Is CVE-2017-5495 being exploited?

Low — EPSS is 3.8%, meaning exploitation activity has not been observed at scale.

Affected packages (1)

• from 0, < 1.1.1-r0

CVSS scores

References (1)

• ADVISORYsecurity.alpinelinux.org/vuln/CVE-2017-5495