[krbdev.mit.edu #8458] git commit

[Greg Hudson via RT]

Fix S4U2Self KDC crash when anon is restricted

In validate_as_request(), when enforcing restrict_anonymous_to_tgt,
use client.princ instead of request->client; the latter is NULL when
validating S4U2Self requests.

CVE-2016-3120:

In MIT krb5 1.9 and later, an authenticated attacker can cause krb5kdc
to dereference a null pointer if the restrict_anonymous_to_tgt option
is set to true, by making an S4U2Self request.

  CVSSv2 Vector: AV:N/AC:H/Au:S/C:N/I:N/A:C/E:H/RL:OF/RC:C

https://github.com/krb5/krb5/commit/93b4a6306a0026cf1cc31ac4bd8a49ba5d034ba7
Author: Greg Hudson <ghudson at mit.edu>
Commit: 93b4a6306a0026cf1cc31ac4bd8a49ba5d034ba7
Branch: master
 src/kdc/kdc_util.c    |    2 +-
 src/tests/t_pkinit.py |    5 +++++
 2 files changed, 6 insertions(+), 1 deletions(-)