USN-3512-1: OpenSSL vulnerabilities

Ubuntu Security Notice USN-3512-1

11th December, 2017

openssl vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 17.10
  • Ubuntu 17.04
  • Ubuntu 16.04 LTS

Summary

Several security issues were fixed in OpenSSL.

Software description

  • openssl - Secure Socket Layer (SSL) cryptographic library and tools

Details

David Benjamin discovered that OpenSSL did not correctly prevent
buggy applications that ignore handshake errors from subsequently calling
certain functions. (CVE-2017-3737)

It was discovered that OpenSSL incorrectly performed the x86_64 Montgomery
multiplication procedure. While unlikely, a remote attacker could possibly
use this issue to recover private keys. (CVE-2017-3738)

Update instructions

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

Ubuntu 17.10:
libssl1.0.0 1.0.2g-1ubuntu13.3
Ubuntu 17.04:
libssl1.0.0 1.0.2g-1ubuntu11.4
Ubuntu 16.04 LTS:
libssl1.0.0 1.0.2g-1ubuntu4.10

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

After a standard system update you need to reboot your computer to make
all the necessary changes.

References

CVE-2017-3737, CVE-2017-3738