Public bug reported:

The version of BouncyCastle available on Xenial is affected by multiple
security vulnerabilities:

https://people.canonical.com/~ubuntu-security/cve/CVE-2015-6644
https://people.canonical.com/~ubuntu-security/cve/CVE-2016-1000338
https://people.canonical.com/~ubuntu-security/cve/CVE-2016-1000339
https://people.canonical.com/~ubuntu-security/cve/CVE-2016-1000340
https://people.canonical.com/~ubuntu-security/cve/CVE-2016-1000341
https://people.canonical.com/~ubuntu-security/cve/CVE-2016-1000342
https://people.canonical.com/~ubuntu-security/cve/CVE-2016-1000343
https://people.canonical.com/~ubuntu-security/cve/CVE-2016-1000344
https://people.canonical.com/~ubuntu-security/cve/CVE-2016-1000345
https://people.canonical.com/~ubuntu-security/cve/CVE-2016-1000346
https://people.canonical.com/~ubuntu-security/cve/CVE-2016-1000352


I guess that the options are:
- Apply the two missing patches in Bionic version:
https://people.canonical.com/~ubuntu-security/cve/CVE-2018-1000180
https://people.canonical.com/~ubuntu-security/cve/CVE-2018-1000613
And backport it to Xenial.

- Using the version with the security patches from Debian Stretch
(1.56): https://metadata.ftp-
master.debian.org/changelogs//main/b/bouncycastle/bouncycastle_1.56-1+deb9u2_changelog

** Affects: bouncycastle (Ubuntu)
     Importance: Undecided
         Status: New

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2015-6644

** CVE added: https://cve.mitre.org/cgi-
bin/cvename.cgi?name=2016-1000338

** CVE added: https://cve.mitre.org/cgi-
bin/cvename.cgi?name=2016-1000339

** CVE added: https://cve.mitre.org/cgi-
bin/cvename.cgi?name=2016-1000340

** CVE added: https://cve.mitre.org/cgi-
bin/cvename.cgi?name=2016-1000341

** CVE added: https://cve.mitre.org/cgi-
bin/cvename.cgi?name=2016-1000342

** CVE added: https://cve.mitre.org/cgi-
bin/cvename.cgi?name=2016-1000343

** CVE added: https://cve.mitre.org/cgi-
bin/cvename.cgi?name=2016-1000344

** CVE added: https://cve.mitre.org/cgi-
bin/cvename.cgi?name=2016-1000345

** CVE added: https://cve.mitre.org/cgi-
bin/cvename.cgi?name=2016-1000346

** CVE added: https://cve.mitre.org/cgi-
bin/cvename.cgi?name=2016-1000352

** Summary changed:

- Version 1.51 affected by multiple vulnerabilitites
+ Version 1.51 affected by multiple security vulnerabilitites

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https://bugs.launchpad.net/bugs/1836175

Title:
  Version 1.51 affected by multiple security vulnerabilitites

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