[Bug 988520] Re: After failed auth, subsequent auths in same context fail

[Brian Murray]

Hello Russ, or anyone else affected,

Accepted krb5 into precise-proposed. The package will build now and be
available in a few hours. Please test and give feedback here. See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to
enable and use -proposed. Thank you in advance!

** Changed in: krb5 (Ubuntu Precise)
       Status: Triaged => Fix Committed

** Tags added: verification-needed

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to krb5 in Ubuntu.
https://bugs.launchpad.net/bugs/988520

Title:
  After failed auth, subsequent auths in same context fail

Status in “krb5” package in Ubuntu:
  Fix Released
Status in “krb5” source package in Precise:
  Fix Committed
Status in “krb5” package in Debian:
  Fix Released

Bug description:
  SRU Justification

  [Impact]

  If an authentication fails after preauth was requested, all subsequent
  preauth-required authentications in the same Kerberos context will
  also fail. This breaks password change when credentials have expired,
  and also breaks try_first_pass functionality in Kerberos PAM modules.

  [Development Fix]

  New upstream release. Updated in Debian. Synced in Ubuntu. Verified
  fixed on Quantal using test case below.

  [Stable Fix]

  Upstream patch cherry-picked. Debdiff attached.

  [Test Case]

  testcase.sh attached.

  [Regression Potential]

  Low: one line patch for missing initialisation written by upstream.


  Original report by Russ Allbery:

  MIT Kerberos 1.10 (including pre-releases and betas) exposed a bug in
  the tracking of preauth mechanisms such that, if an authentication
  fails after preauth was requested, all subsequent preauth-required
  authentications in the same Kerberos context will also fail.

  This breaks password change when credentials have expired, and also
  breaks try_first_pass functionality in Kerberos PAM modules.

  Upstream has fixed this problem in their mainline with commit 25822.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/krb5/+bug/988520/+subscriptions