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Test ID:1.3.6.1.4.1.25623.1.0.61489
Category:Ubuntu Local Security Checks
Title:Ubuntu USN-612-4 (ssl-cert)
Summary:Ubuntu USN-612-4 (ssl-cert)
Description:
The remote host is missing an update to ssl-cert
announced via advisory USN-612-4.

A security issue affects the following Ubuntu releases:

Ubuntu 7.04
Ubuntu 7.10
Ubuntu 8.04 LTS

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

Details follow:

USN-612-1 fixed vulnerabilities in openssl. This update provides the
corresponding updates for ssl-cert -- potentially compromised snake-oil
SSL certificates will be regenerated.

Original advisory details:

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)

== 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
* 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.

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

Ubuntu 7.04:
ssl-cert 1.0.13-0ubuntu0.7.04.1

Ubuntu 7.10:
ssl-cert 1.0.14-0ubuntu0.7.10.1

Ubuntu 8.04 LTS:
ssl-cert 1.0.14-0ubuntu2.1

In general, a standard system upgrade is sufficient to effect the
necessary changes.

http://www.securityspace.com/smysecure/catid.html?in=USN-612-4
CVE-2008-0166, http://www.ubuntu.com/usn/usn-612-1

Risk factor : High
Cross-Ref: Common Vulnerability Exposure (CVE) ID: CVE-2008-0166
Bugtraq: 20080515 Debian generated SSH-Keys working exploit (Google Search)
http://www.securityfocus.com/archive/1/archive/1/492112/100/0/threaded
http://www.milw0rm.com/exploits/5622
http://www.milw0rm.com/exploits/5632
http://www.milw0rm.com/exploits/5720
http://sourceforge.net/mailarchive/forum.php?thread_name=48367252.7070603%40shemesh.biz&forum_name=rsyncrypto-devel
http://metasploit.com/users/hdm/tools/debian-openssl/
Debian Security Information: DSA-1571 (Google Search)
http://www.debian.org/security/2008/dsa-1571
Debian Security Information: DSA-1576 (Google Search)
http://www.debian.org/security/2008/dsa-1576
http://www.ubuntu.com/usn/usn-612-1
http://www.ubuntu.com/usn/usn-612-2
http://www.ubuntu.com/usn/usn-612-3
http://www.ubuntu.com/usn/usn-612-4
http://www.ubuntu.com/usn/usn-612-7
Cert/CC Advisory: TA08-137A
http://www.us-cert.gov/cas/techalerts/TA08-137A.html
CERT/CC vulnerability note: VU#925211
http://www.kb.cert.org/vuls/id/925211
BugTraq ID: 29179
http://www.securityfocus.com/bid/29179
http://www.securitytracker.com/id?1020017
http://secunia.com/advisories/30220
http://secunia.com/advisories/30221
http://secunia.com/advisories/30231
http://secunia.com/advisories/30239
http://secunia.com/advisories/30249
http://secunia.com/advisories/30136
XForce ISS Database: openssl-rng-weak-security(42375)
http://xforce.iss.net/xforce/xfdb/42375
CopyrightCopyright (c) 2008 E-Soft Inc. http://www.securityspace.com

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