Weak Debian OpenSSH Keys in ~/.ssh/authorized_keys

This script is Copyright (C) 2008-2016 Tenable Network Security, Inc.


Synopsis :

The remote SSH host is set up to accept authentication with weak
Debian SSH keys.

Description :

The remote host has one or more ~/.ssh/authorized_keys files
containing weak SSH public keys generated on a Debian or Ubuntu
system.

The problem is due to a Debian packager removing nearly all sources of
entropy in the remote version of OpenSSL.

This problem does not only affect Debian : any user uploading a weak
SSH key into his ~/.ssh/authorized_keys file will compromise the
security of the remote system.

An attacker could try a brute-force attack against the remote host and
logon using these weak keys.

Solution :

Remove all the offending entries from ~/.ssh/authorized_keys.

Risk factor :

Critical / CVSS Base Score : 10.0
(CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C)
CVSS Temporal Score : 8.3
(CVSS2#E:F/RL:OF/RC:C)
Public Exploit Available : true

Family: Gain a shell remotely

Nessus Plugin ID: 32320 ()

Bugtraq ID: 29179

CVE ID: CVE-2008-0166

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