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CVE-2015-5370: s4:rpc_server: let invalid request fragments disconnect the connection with a protocol error

Browse Source 
BUG: https://bugzilla.samba.org/show_bug.cgi?id=11344

Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Günther Deschner <gd@samba.org>
This commit is contained in:
Stefan Metzmacher 2015-06-26 08:10:46 +02:00
parent 5cb1250457
commit 57afdaa79b
1 changed files with 12 additions and 11 deletions
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23
source4/rpc_server/dcerpc_server.c
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@ -1456,33 +1456,34 @@ static NTSTATUS dcesrv_process_ncacn_packet(struct dcesrv_connection *dce_conn,
struct dcesrv_call_state *call2 = call;
uint32_t alloc_size;
/* we only allow fragmented requests, no other packet types */
if (call->pkt.ptype != DCERPC_PKT_REQUEST) {
return dcesrv_fault(call2, DCERPC_FAULT_OTHER);
}
/* this is a continuation of an existing call - find the call
then tack it on the end */
call = dcesrv_find_fragmented_call(dce_conn, call2->pkt.call_id);
if (!call) {
return dcesrv_fault(call2, DCERPC_FAULT_OTHER);
return dcesrv_fault_disconnect(call2,
DCERPC_NCA_S_PROTO_ERROR);
}
if (call->pkt.ptype != call2->pkt.ptype) {
/* trying to play silly buggers are we? */
return dcesrv_fault(call2, DCERPC_NCA_S_PROTO_ERROR);
return dcesrv_fault_disconnect(call,
DCERPC_NCA_S_PROTO_ERROR);
}
if (memcmp(call->pkt.drep, call2->pkt.drep, sizeof(pkt->drep)) != 0) {
return dcesrv_fault(call2, DCERPC_NCA_S_PROTO_ERROR);
return dcesrv_fault_disconnect(call,
DCERPC_NCA_S_PROTO_ERROR);
}
if (call->pkt.call_id != call2->pkt.call_id) {
return dcesrv_fault(call2, DCERPC_NCA_S_PROTO_ERROR);
return dcesrv_fault_disconnect(call,
DCERPC_NCA_S_PROTO_ERROR);
}
if (call->pkt.u.request.context_id != call2->pkt.u.request.context_id) {
return dcesrv_fault(call2, DCERPC_NCA_S_PROTO_ERROR);
return dcesrv_fault_disconnect(call,
DCERPC_NCA_S_PROTO_ERROR);
}
if (call->pkt.u.request.opnum != call2->pkt.u.request.opnum) {
return dcesrv_fault(call2, DCERPC_NCA_S_PROTO_ERROR);
return dcesrv_fault_disconnect(call,
DCERPC_NCA_S_PROTO_ERROR);
}
alloc_size = call->pkt.u.request.stub_and_verifier.length +