Ubuntu 4.10 : openssh information leakage (USN-34-1)

Ubuntu Security Notice (C) 2004-2013 Canonical, Inc. / NASL script (C) 2006-2013 Tenable Network Security, Inc.


Synopsis :

The remote Ubuntu host is missing one or more security-related patches.

Description :

@Mediaservice.net discovered two information leaks in the OpenSSH
server. When using password authentication, an attacker could test
whether a login name exists by measuring the time between failed login
attempts, i. e. the time after which the 'password:' prompt appears
again.

A similar issue affects systems which do not allow root logins over
ssh ('PermitRootLogin no'). By measuring the time between login
attempts an attacker could check whether a given root password is
correct. This allowed determining weak root passwords using a brute
force attack.

Solution :

Update the affected packages.

Risk factor :

Medium / CVSS Base Score : 5.0
(CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N)

Family: Ubuntu Local Security Checks

Nessus Plugin ID: 20650 ()

Bugtraq ID:

CVE ID: CVE-2003-0190