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Stefan Metzmacher d3123858fb CVE-2020-1472(ZeroLogon): libcli/auth: reject weak client challenges in netlogon_creds_server_init()
This implements the note from MS-NRPC 3.1.4.1 Session-Key Negotiation:

 7. If none of the first 5 bytes of the client challenge is unique, the
    server MUST fail session-key negotiation without further processing of
    the following steps.

It lets ./zerologon_tester.py from
https://github.com/SecuraBV/CVE-2020-1472.git
report: "Attack failed. Target is probably patched."

BUG: https://bugzilla.samba.org/show_bug.cgi?id=14497

Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Gary Lockyer <gary@catalyst.net.nz>
2020-09-18 12:48:38 +00:00
..
2020-01-06 03:12:19 +00:00