Mandriva Linux Security Advisory - An input validation flaw was found in X.org's MIT-SHM extension. A client connected to the X.org server could read arbitrary server memory, resulting in the disclosure of sensitive data of other users of the X.org server. Multiple integer overflows were found in X.org's Render extension. A malicious authorized client could exploit these issues to cause a denial of service (crash) or possibly execute arbitrary code with root privileges on the X.org server. The Metisse program is likewise affected by these issues; the updated packages have been patched to prevent them.
21ab26995f3e8ac3cf68bea088a9613c7a17cdd32ee933bb7754a04a8a14dea0Gentoo Linux Security Advisory GLSA 200806-07 - Multiple vulnerabilities have been discovered in the X.Org X server, possibly allowing for the remote execution of arbitrary code with root privileges. Versions less than 1.3.0.0-r6 are affected.
c436c08a829831b69be8b3fbef436c0feeb53912329ac936cbc711ea80355b96Mandriva Linux Security Advisory - An input validation flaw was found in X.org's Security and Record extensions. A malicious authorized client could exploit the issue to cause a denial of service (crash) or possibly execute arbitrary code with root privileges on the X.org server. An input validation flaw was found in X.org's MIT-SHM extension. A client connected to the X.org server could read arbitrary server memory, resulting in the disclosure of sensitive data of other users of the X.org server. Multiple integer overflows were found in X.org's Render extension. A malicious authorized client could exploit these issues to cause a denial of service (crash) or possibly execute arbitrary code with root privileges on the X.org server. In addition, this update corrects a problem that could cause memory corruption or segfaults in the render code of the vnc server on Mandriva Linux 2008.1
5ffea7cb2bcdc6377984292956c0256c79820cff0d71079514b6e9198832c821Ubuntu Security Notice 616-1 - Multiple flaws were found in the RENDER, RECORD, and Security extensions of X.org which did not correctly validate function arguments. An authenticated attacker could send specially crafted requests and gain root privileges or crash X. It was discovered that the MIT-SHM extension of X.org did not correctly validate the location of memory during an image copy. An authenticated attacker could exploit this to read arbitrary memory locations within X, exposing sensitive information.
e68afa4a3b9f564a0925b4738fb8574270851a397d02743a5151ba59b408b24aDebian Security Advisory 1595-1 - Lack of validation of the parameters of the SProcSecurityGenerateAuthorization SProcRecordCreateContext functions makes it possible for a specially crafted request to trigger the swapping of bytes outside the parameter of these requests, causing memory corruption. An integer overflow in the validation of the parameters of the ShmPutImage() request makes it possible to trigger the copy of arbitrary server memory to a pixmap that can subsequently be read by the client, to read arbitrary parts of the X server memory space. An integer overflow may occur in the computation of the size of the glyph to be allocated by the AllocateGlyph() function which will cause less memory to be allocated than expected, leading to later heap overflow. An integer overflow may occur in the computation of the size of the glyph to be allocated by the ProcRenderCreateCursor() function which will cause less memory to be allocated than expected, leading later to dereferencing un-mapped memory, causing a crash of the X server. Integer overflows can also occur in the code validating the parameters for the SProcRenderCreateLinearGradient, SProcRenderCreateRadialGradient and SProcRenderCreateConicalGradient functions, leading to memory corruption by swapping bytes outside of the intended request parameters.
8bb80d9e191b414bb1fc52ae160f8716e0f93880b309bf094fa85c41663b059fiDefense 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 execute arbitrary code with the privileges of the X server, typically root. iDefense has confirmed the existence of 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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