The chain_reply function in process.c in smbd in Samba before 3.4.8
and 3.5.x before 3.5.2 allows remote attackers to cause a denial of
service (NULL pointer dereference and process crash) via a Negotiate
Protocol request with a certain 0x0003 field value followed by a
Session Setup AndX request with a certain 0x8003 field value.
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