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Family: Ubuntu Local Security Checks --> Category: infos

USN179-1 : openssl weak default configuration Vulnerability Scan

Vulnerability Scan Summary
openssl weak default configuration

Detailed Explanation for this Vulnerability Test

Synopsis :

These remote packages are missing security patches :
- libssl-dev
- libssl0.9.7
- openssl

Description :

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 a possible hacker
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

Solution :

Upgrade to :
- libssl-dev-0.9.7e-3ubuntu0.1 (Ubuntu 5.04)
- libssl0.9.7-0.9.7e-3ubuntu0.1 (Ubuntu 5.04)
- openssl-0.9.7e-3ubuntu0.1 (Ubuntu 5.04)

Threat Level: High

Click HERE for more information and discussions on this network vulnerability scan.


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