CVE-2005-1206

An anonymous remote attacker can deliver a specially crafted SMB message to an affected system over TCP ports 139 or 445 [ref_id=1]. The vulnerable SMB packet validation logic fails to properly check the incoming data before passing it to an allocated buffer, causing a buffer overflow. An attacker who successfully exploits this overflow can achieve remote code execution with full system privileges, or cause a denial of service [ref_id=1].

The vulnerability resides in the Server Message Block (SMB) implementation within the affected Windows operating systems. The advisory does not specify exact function names or file paths, but states the flaw is in "the process that the affected operating systems use to validate certain incoming SMB packets" [ref_id=1].

The security update "modif[ies] the way that the affected operating systems validate SMB network packets before they pass the data to the allocated buffer" [ref_id=1]. By correcting the packet validation logic, the update ensures that malformed or oversized SMB packets are rejected before they can overflow the buffer. No patch diff is available in the bundle; the above description is the vendor's own summary of the fix [ref_id=1].