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1.5.1 Ensure address space layout randomization is enabled

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Information

Address space layout randomization (ASLR) is an exploit mitigation technique which randomly arranges the address space of key data areas of a process.

Randomly placing virtual memory regions will make it difficult to write memory page exploits as the memory placement will be consistently shifting.

Solution

Set the following parameter in /etc/sysctl.conf or a file in /etc/sysctl.d/ ending in .conf :

 - kernel.randomize_va_space = 2

Example:

 # printf "%s\n" "kernel.randomize_va_space = 2" >> /etc/sysctl.d/60-kernel_sysctl.conf

Run the following command to set the active kernel parameter:

 # sysctl -w kernel.randomize_va_space=2

 Note: If these settings appear in a canonically later file, or later in the same file, these settings will be overwritten

See Also

https://workbench.cisecurity.org/benchmarks/18959

Item Details

References: CSCv7|8.3

Plugin: Unix

Control ID: 231db8bbd50778e895ccd4c008337a38c4b1c94b0856052b9214e4dc529d303e