Smokey's Security Weblog

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Ubuntu and Debian: extremely serious openssl vulnerability

A weakness has been discovered in the random number generator used by OpenSSL on Debian and Ubuntu systems. As a result of this weakness, certain encryption keys are much more common than they should be, such that an attacker could guess the key through a brute-force attack given minimal knowledge of the system. This particularly affects the use of encryption keys in OpenSSH, OpenVPN and SSL certificates.

This vulnerability only affects operating systems which (like Ubuntu) are based on Debian. However, other systems can be indirectly affected if weak keys are imported into them.

We consider this an extremely serious vulnerability, and urge all users to act immediately to secure their systems. (CVE-2008-0166)

This advisory also applies to the corresponding versions of Kubuntu, Edubuntu, and Xubuntu.

== Who is affected ==

Systems which are running any of the following releases:

* Ubuntu 7.04 (Feisty)
* Ubuntu 7.10 (Gutsy)
* Ubuntu 8.04 LTS (Hardy)
* Ubuntu “Intrepid Ibex” (development): libssl <= 0.9.8g-8
* Debian 4.0 (etch) (see corresponding Debian security advisory)

and have openssh-server installed or have been used to create an OpenSSH key or X.509 (SSL) certificate.

All OpenSSH and X.509 keys generated on such systems must be considered untrustworthy, regardless of the system on which they are used, even after the update has been applied.
This includes the automatically generated host keys used by OpenSSH, which are the basis for its server spoofing and man-in-the-middle protection.

The problem can be corrected by upgrading your system to the following package versions:

Ubuntu 7.04:
libssl0.9.8 0.9.8c-4ubuntu0.3

Ubuntu 7.10:
libssl0.9.8 0.9.8e-5ubuntu3.2

Ubuntu 8.04 LTS:
libssl0.9.8 0.9.8g-4ubuntu3.1

Source: Ubuntu.com

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May 13, 2008 Posted by | Advisories, Alerts, Downloads, Friends, News, Recommended External Security Related Links, Uncategorized, Vulnerabilities | , , , , , , , , , , , , , , , , , , , | Leave a comment

Photobucket are not cleaning up their act: continuous malvertizements on their website

Photobucket has been mentioned several times because of malvertizements appearing on the site. The most recent outbreak is proving to be problematic, to say the least.

They have been advised several times that there are malvertizements appearing on their web site. Photobucket have been given sufficient information to enable them to quickly identify and remove the malvertizements. Email acknowledgements have been received from Photobucket advising that the malvertizement reports would be forwarded to the “advertising team”.

The malvertizements have also been reported to the advertising networks being used to host and distribute the malvertizements.

Why, then, are the malvertizements cited here still appearing on the Photobucket web site?

rlslog.net were able to get rid of the malvertizements reported to them. mininova.org were able to get rid of the malvertizements that were reported to them. Why is it so hard for photobucket.com to clean up *their* act???

For reason of the condemnable ignore attitude/tactics of Photobucket and to protect the user against malware the strong advice:

nobody should visit photobucket.com unless they have software in place that will prevent any advertisements on that site from being displayed on their computer.

This advice stands unless and until the malvertizements are removed AND photobucket.com can reassure that:

1. Photobucket have improved their investigative processes when checking advertisements offered to them to minimise the possibility of this happening again; and
2. Photobucket have put in place new procedures to ensure that reports of malvertizements are identified and acted upon immediately.

Source: SpywareSucks

May 13, 2008 Posted by | Advisories, Alerts, Friends, Malware, News, Recommended External Security Related Links, Vulnerabilities | , , , , , , , , , | Leave a comment