Secunia Research has discovered a vulnerability in Samba, which can be exploited by malicious people to compromise a vulnerable system. The vulnerability is caused due to a boundary error within the "receive_smb_raw()" function in lib/util_sock.c when parsing SMB packets. This can be exploited to cause a heap-based buffer overflow via an overly large SMB packet received in a client context. Successful exploitation allows execution of arbitrary code by tricking a user into connecting to a malicious server (e.g. by clicking an "smb://" link) or by sending specially crafted packets to an "nmbd" server configured as a local or domain master browser. Samba versions 3.0.28a and 3.0.29 are affected.
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