Dropbear SSH Authorization-pending Connection Saturation DoS

This script is Copyright (C) 2006-2013 Tenable Network Security, Inc.


Synopsis :

The remote SSH server is susceptible to denial of service attacks.

Description :

The remote host is running Dropbear, a small, open source SSH server.

The version of Dropbear installed on the remote host, by default, has
a limit of 30 connections in the authorization-pending state

subsequent connections are closed immediately. This issue can be
exploited trivially by an unauthenticated attacker to deny service to
legitimate users.

See also :

http://www.securityfocus.com/archive/1/426999/30/0/threaded
http://www.nessus.org/u?2eacaa91

Solution :

Upgrade to Dropbear 0.48 or later.

Risk factor :

Medium / CVSS Base Score : 5.0
(CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P)
CVSS Temporal Score : 4.1
(CVSS2#E:F/RL:OF/RC:ND)
Public Exploit Available : true

Family: Denial of Service

Nessus Plugin ID: 21023 (dropbear_30_dos.nasl)

Bugtraq ID: 17024

CVE ID: CVE-2006-1206