Verified fixed on Quantal. Just need the SRU for Precise now. Note that
the test script fails some other tests. This bug addresses the "module
/bad-authtok" test only.
** Description changed:
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. Pending sync in Ubuntu.
- Verified in Ubuntu manually.
+ 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.
** Changed in: krb5 (Ubuntu)
Status: Triaged => Fix Released
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https://bugs.launchpad.net/bugs/988520
Title:
After failed auth, subsequent auths in same context fail
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