[USN-612-4] ssl-cert vulnerability

Kees Cook kees at ubuntu.com
Wed May 14 09:12:20 UTC 2008

Ubuntu Security Notice USN-612-4               May 14, 2008
ssl-cert vulnerability
CVE-2008-0166, http://www.ubuntu.com/usn/usn-612-1

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.

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.

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 <= 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

Updated packages for Ubuntu 7.04:

  Source archives:

      Size/MD5:      793 109f4a29848119dfbc614e7674bada8e
      Size/MD5:    11552 b863931133919dfafe05c24e70bab9f6

  Architecture independent packages:

      Size/MD5:    10378 6d5c910cb0a5ece3b7273de556193a9a

Updated packages for Ubuntu 7.10:

  Source archives:

      Size/MD5:      793 224c3d477485b8b47620493bd94f96d4
      Size/MD5:    14460 a9a6aef14698db961d7ebca02fa1f8ec

  Architecture independent packages:

      Size/MD5:    12014 153b5c06ea0f13b3e6d080f53d06d5b5

Updated packages for Ubuntu 8.04 LTS:

  Source archives:

      Size/MD5:      783 f97ec277d2d22408e1384c3919dd1e9b
      Size/MD5:    14726 6f4f4ceacb84709ea30f401e2a18b6ec

  Architecture independent packages:

      Size/MD5:    12274 2f74cb6f5207ce320ab75ae5fe537658

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