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

[Russ Allbery]

Public bug reported:

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.

** Affects: krb5 (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: krb5 (Debian)
     Importance: Unknown
         Status: Unknown

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

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