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Debian Linux Security Advisory 1595-1
Posted Jun 13, 2008
Authored by Debian | Site debian.org

Debian 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.

tags | advisory, overflow, arbitrary
systems | linux, debian
advisories | CVE-2008-1377, CVE-2008-1379, CVE-2008-2360, CVE-2008-2361, CVE-2008-2362
SHA-256 | 8bb80d9e191b414bb1fc52ae160f8716e0f93880b309bf094fa85c41663b059f

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