An X server must have none of the following options enabled: -ac, -core (except for debugging purposes), or -nolock.

From Red Hat Enterprise Linux 5 Security Technical Implementation Guide

Part of GEN000000-LNX00380

Associated with IA controls: ECSC-1

Associated with: CCI-000032 CCI-000366

SV-37217r2_rule An X server must have none of the following options enabled: -ac, -core (except for debugging purposes), or -nolock.

Vulnerability discussion

These options will detract from the security of the Xwindows system.

Check content

Fix text

Disable the unwanted options: Procedure: For gdm: Remove the -ac, -core and -nolock options by creating a "command" entry in the /etc/gdm/custom.conf file with the options removed. For Xwindows started by xinit: Create or modify the .xserverrc script in the users home directory to remove the -ac, -core and -nolock options from the exec /usr/bin/X command.

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