Ensure XD/NX support is enabled

中级别 1自动化ros

说明

Recent processors in the x86 family support the ability to prevent code execution on a per memory page basis. Generically and on AMD processors, this ability is called No Execute (NX), while on Intel processors it is called Execute Disable (XD). This ability can help prevent exploitation of buffer overflow vulnerabilities and should be activated whenever possible. The audit requires the nx CPU flag (or the kernel "NX (Execute Disable) protection: active" message) and no noexec=off on the kernel command line. Host-level control from the CIS ROS Melodic benchmark (Ubuntu 18.04 robot hosts); run as root.

检查方式

审计方法: Shell 命令

shell

grep -Eq 'noexec[0-9]*=off' /proc/cmdline && { echo 'NX disabled on the kernel command line'; exit 1; }
grep -Eqw 'nx' /proc/cpuinfo && echo compliant || { journalctl -k 2>/dev/null | grep -q 'protection: active' && echo compliant || echo 'NX/XD protection not active'; }

预期输出: compliant

修复方式

修复方法: 操作指南或基础设施补丁

On 32 bit systems install a kernel with PAE support, no installation is required on 64 bit systems: If necessary configure your bootloader to load the new kernel and reboot the system. You may need to enable NX or XD support in your bios.

属性

操作系统: 任意
标签: rosros1melodicsystem
参考: CIS ROS Melodic Benchmark v1.0.0 - 1.6.1 Ensure XD/NX support is enabled

检查本机

请在您有权审计的机器上运行此命令。扫描为只读操作。

shell

tmaegis scan --target ros