iDefense Security Advisory 06.11.08 - Local exploitation of an integer overflow vulnerability in the X.Org X server, as included in various vendors' operating system distributions, could allow an attacker to create a denial of service (DoS) condition on the affected X server. The vulnerability exists within the ProcRenderCreateCursor() function. When parsing a client request, values are taken from the request and used in an arithmetic operation that calculates the size of a dynamic buffer. This calculation can overflow, which results in an undersized buffer being allocated. This leads to an invalid memory access, which crashes the X server. iDefense has confirmed the existence of these this vulnerability in X.org X11 version R7.3, with all patches as of 03/01/08 applied. Previous versions may also be affected.
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