s3:libsmb: check the wct of the incoming SMBnegprot responses

metze

Fix bug #8452 (negprot reply needs to check vwv vector length).

The corresponding commit in master is 85332eb1c721d585e1a33101bddafdca4073e10f.

diff --git a/source3/libsmb/cliconnect.c b/source3/libsmb/cliconnect.c
index d3248993bd9bb0e9e8663f265a613f3bf3b6e54d..81c1819964fa4db07c764acafc5c55739c85bfce 100644 (file)
--- a/source3/libsmb/cliconnect.c
+++ b/source3/libsmb/cliconnect.c
@@ -2643,6 +2643,11 @@ static void cli_negprot_done(struct tevent_req *subreq)
                struct timespec ts;
                bool negotiated_smb_signing = false;
 
+               if (wct != 0x11) {
+                       tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
+                       return;
+               }
+
                /* NT protocol */
                cli->sec_mode = CVAL(vwv + 1, 0);
                cli->max_mux = SVAL(vwv + 1, 1);
@@ -2716,6 +2721,11 @@ static void cli_negprot_done(struct tevent_req *subreq)
                }
 
        } else if (cli->protocol >= PROTOCOL_LANMAN1) {
+               if (wct != 0x0D) {
+                       tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
+                       return;
+               }
+
                cli->use_spnego = False;
                cli->sec_mode = SVAL(vwv + 1, 0);
                cli->max_xmit = SVAL(vwv + 2, 0);