Ubuntu Security Notice (C) 2005-2016 Canonical, Inc. / NASL script (C) 2006-2016 Tenable Network Security, Inc.
The remote Ubuntu host is missing one or more security-related
The current default algorithm for creating 'message digests'
(electronic signatures) for certificates created by openssl is MD5.
However, this algorithm is not deemed secure any more, and some
practical attacks have been demonstrated which could allow an attacker
to forge certificates with a valid certification authority signature
even if he does not know the secret CA signing key.
Therefore all Ubuntu versions of openssl have now been changed to use
SHA-1 by default. This is a more appropriate default algorithm for the
majority of use cases; however, if you still want to use MD5 as
default, you can revert this change by changing the two instances of
'default_md = sha1' to 'default_md = md5' in /etc/ssl/openssl.cnf.
A detailed explanation and further links can be found at
Note that Tenable Network Security has extracted the preceding
description block directly from the Ubuntu security advisory. Tenable
has attempted to automatically clean and format it as much as possible
without introducing additional issues.
Update the affected libssl-dev, libssl0.9.7 and / or openssl packages.
Risk factor :
Medium / CVSS Base Score : 5.0
CVSS Temporal Score : 5.0
Public Exploit Available : false