USN-339-1: OpenSSL vulnerability

5 September 2006

OpenSSL vulnerability

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Releases

Details

Philip Mackenzie, Marius Schilder, Jason Waddle and Ben Laurie of
Google Security discovered that the OpenSSL library did not
sufficiently check the padding of PKCS #1 v1.5 signatures if the
exponent of the public key is 3 (which is widely used for CAs). This
could be exploited to forge signatures without the need of the secret
key.

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Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

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Update instructions

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

Ubuntu 6.06
  • libssl0.9.8 - 0.9.8a-7ubuntu0.1
Ubuntu 5.10
  • libssl0.9.7 - 0.9.7g-1ubuntu1.2
Ubuntu 5.04
  • libssl0.9.7 - 0.9.7e-3ubuntu0.3

After a standard system upgrade you need to reboot your computer to
effect the necessary changes.

References

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Further reading