[Bug 1940656] Re: Potential use after free bugs in 1.1.1

[Steve Langasek]

Hello Dimitri, or anyone else affected,

Accepted openssl into focal-proposed. The package will build now and be
available at
https://launchpad.net/ubuntu/+source/openssl/1.1.1f-1ubuntu2.9 in a few
hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.  Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, what testing has been
performed on the package and change the tag from verification-needed-
focal to verification-done-focal. If it does not fix the bug for you,
please add a comment stating that, and change the tag to verification-
failed-focal. In either case, without details of your testing we will
not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance for helping!

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.

** Changed in: openssl (Ubuntu Focal)
       Status: In Progress => Fix Committed

** Tags added: verification-needed verification-needed-focal

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https://bugs.launchpad.net/bugs/1940656

Title:
  Potential use after free bugs in 1.1.1

Status in openssl package in Ubuntu:
  Fix Released
Status in openssl source package in Focal:
  Fix Committed

Bug description:
  [Impact]

   * There have been multiple use-after-free bugs fixed in OpenSSL 1.1.1
  stable branches which have not yet been applied in Focal. They are
  difficult to reproduce, often require an engine to be used, and
  somehow fail, as these use-after-free bugs are all in error conditions
  and error paths. Usually fixing local configuration, and making engine
  available is the right solution. It is however better to return errors
  than crash. These patches are in 1.1.1h+ and openssl-3.

  [Test Plan]

   * The fixes were applied upstream without clear reproducers, or unit
  tests

   * Check that all autopkgtests pass and there no regressions

   * Configure and use openssl with any engine and ensure that it
  continues to work

  [Where problems could occur]

   * There will be behaviour change, such that multithreaded
  applications may now notice Null pointers from the openssl engine
  apis, when previously they saw valid pointers which were freed
  already. Meaning that on connection failures, daemon or application
  shutdowns, different messages might be generated i.e. invalid engine
  context, unallocated methods, instead of crashing with double free.

  [Other Info]

   * Multiple customers are using openssl 1.1.1 with engines these days,
  reporting various issues, it is better to have more resilient openssl
  w.r.t. engine use in case of engine missuse.

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