In X.Org Server (aka xserver and xorg-server) before 1.19.4, a local attacker authenticated to the X server could overflow a global buffer, causing crashes of the X server or potentially other problems by injecting large or malformed XKB related atoms and accessing them via xkbcomp.
The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.
| Link | Tags |
|---|---|
| http://www.securityfocus.com/bid/101253 | third party advisory vdb entry |
| https://cgit.freedesktop.org/xorg/xserver/commit/?id=94f11ca5cf011ef123bd222cabeaef6f424d76ac | third party advisory |
| https://lists.debian.org/debian-lts-announce/2017/11/msg00032.html | mailing list |
| https://security.gentoo.org/glsa/201710-30 | third party advisory vendor advisory |
| http://www.openwall.com/lists/oss-security/2017/10/04/10 | third party advisory mailing list |
| http://www.debian.org/security/2017/dsa-4000 | third party advisory vendor advisory |
| https://lists.x.org/archives/xorg-announce/2017-October/002808.html | vendor advisory mailing list |