[USN-612-8] openssl-blacklist update

Jamie Strandboge jamie at canonical.com
Wed May 21 16:31:29 UTC 2008

Ubuntu Security Notice USN-612-8               May 21, 2008
openssl-blacklist update

A security issue affects the following Ubuntu releases:

Ubuntu 6.06 LTS
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 6.06 LTS:
  openssl-blacklist               0.1-0ubuntu0.6.06.1

Ubuntu 7.04:
  openssl-blacklist               0.1-0ubuntu0.7.04.4

Ubuntu 7.10:
  openssl-blacklist               0.1-0ubuntu0.7.10.4

Ubuntu 8.04 LTS:
  openssl-blacklist               0.1-0ubuntu0.8.04.4

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

Details follow:

USN-612-3 addressed a weakness in OpenSSL certificate and key
generation in OpenVPN by introducing openssl-blacklist to aid in
detecting vulnerable private keys. This update enhances the
openssl-vulnkey tool to check X.509 certificates as well, and
provides the corresponding update for Ubuntu 6.06. While the
OpenSSL in Ubuntu 6.06 was not vulnerable, openssl-blacklist is
now provided for Ubuntu 6.06 for checking certificates and keys
that may have been imported on these systems.

This update also includes the complete RSA-1024 and RSA-2048
blacklists for all Ubuntu architectures, as well as support for
other future blacklists for non-standard bit lengths.

You can check for weak SSL/TLS certificates by installing
openssl-blacklist via your package manager, and using the
openssl-vulnkey command.

$ openssl-vulnkey /path/to/certificate_or_key

This command can be used on public certificates and private keys
for any X.509 certificate or RSA key, including ones for web
servers, mail servers, OpenVPN, and others. If in doubt, destroy
the certificate and key and generate new ones. Please consult the
documentation for your software when recreating SSL/TLS
certificates. Also, if certificates have been generated for use
on other systems, they must be found and replaced as well.

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.

Updated packages for Ubuntu 6.06 LTS:

  Source archives:

      Size/MD5:      548 b437e5037437d46ba896cf28be43fa55
      Size/MD5:  8998682 154e882671f25f5ef5a100ef2709cd4e

  Architecture independent packages:

      Size/MD5:  4235438 b78f5861f72699f7699e3f60d7e7d235

Updated packages for Ubuntu 7.04:

  Source archives:

      Size/MD5:      600 8045fc0b37070b448b00123c395af0fd
      Size/MD5:  8999060 4a23e360873f70d978401837a5a1a462

  Architecture independent packages:

      Size/MD5:  4236958 7ec420cb408154facae641776ac1aeaf

Updated packages for Ubuntu 7.10:

  Source archives:

      Size/MD5:      600 e484758b7e017b511fc34eff1878a2eb
      Size/MD5:  8999062 1f59fe1ae585543431a58f050cb8fe46

  Architecture independent packages:

      Size/MD5:  4237110 8451e9872b23fc0f73ef16f384d4dddb

Updated packages for Ubuntu 8.04 LTS:

  Source archives:

      Size/MD5:      600 78f29ecb3d69baf5f529f15a06c41cf4
      Size/MD5:  8999068 d67755ccd109508c460a4a3a830d699d

  Architecture independent packages:

      Size/MD5:  4236630 36f5d84a1cff08e86a6b1646565245e6

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