Ubuntu Security Notice 5690-1 - It was discovered that libXdmcp was generating weak session keys. A local attacker could possibly use this issue to perform a brute force attack and obtain another user's key.
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Red Hat Security Advisory 2017-1865-01 - The X11 libraries provide library routines that are used within all X Window applications. The following packages have been upgraded to a later upstream version: libX11, libXaw, libXdmcp, libXfixes, libXfont, libXi, libXpm, libXrandr, libXrender, libXt, libXtst, libXv, libXvMC, libXxf86vm, libdrm, libepoxy, libevdev, libfontenc, libvdpau, libwacom, libxcb, libxkbfile, mesa, mesa-private-llvm, xcb-proto, xkeyboard-config, xorg-x11-proto-devel.
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Gentoo Linux Security Advisory 201704-3 - Multiple vulnerabilities have been found in X.Org server and libraries, the worse of which allowing local attackers to execute arbitrary code. Versions less than 1.19.2 are affected.
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X.org suffers from privilege escalation, weak entropy, and use-after-free vulnerabilities.
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