ANSSI-BP-028 (high)
Rules and Groups employed by this XCCDF Profile
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Detect stack corruption on calls to schedule()
This option checks for a stack overrun on calls to schedule(). If the stack end location is found to be overwritten always panic as the content of the corrupted region can no longer be trusted. Thi...Rule Medium Severity -
Harden slab freelist metadata
This feature protects integrity of the allocator's metadata. This configuration is available from kernel 4.14. The configuration that was used to build kernel is available at <code>/boot/config-*<...Rule Medium Severity -
Randomize slab freelist
Randomizes the freelist order used on creating new pages. This configuration is available from kernel 5.9, but may be available if backported by distros. The configuration that was used to build k...Rule Medium Severity -
Disallow merge of slab caches
For reduced kernel memory fragmentation, slab caches can be merged when they share the same size and other characteristics. This carries a risk of kernel heap overflows being able to overwrite obje...Rule Medium Severity -
Stack Protector buffer overlow detection
This feature puts, at the beginning of functions, a canary value on the stack just before the return address, and validates the value just before actually returning. This configuration is available...Rule Medium Severity -
Strong Stack Protector
This features adds canary logic protection to more kinds of vulnerable functions than CONFIG_STACKPROTECTOR, but not to all functions so that performance is not severily impacted. This configuratio...Rule Medium Severity -
Make the kernel text and rodata read-only
When set, kernel text and rodata memory will be made read-only, and non-text memory will be made non-executable. This configuration is available from kernel 4.11. The configuration that was used t...Rule Medium Severity -
Make the module text and rodata read-only
When set, module text and rodata memory will be made read-only, and non-text memory will be made non-executable. This configuration is available from kernel 4.11. The configuration that was used t...Rule Medium Severity -
User a virtually-mapped stack
Enable this to use virtually-mapped kernel stacks with guard pages. This configuration is available from kernel 4.9. The configuration that was used to build kernel is available at <code>/boot/con...Rule Medium Severity -
Generate some entropy during boot and runtime
Instrument some kernel code to extract some entropy from both original and artificially created program state. This will help especially embedded systems where there is little 'natural' source of e...Rule Medium Severity -
Randomize layout of sensitive kernel structures
Randomize at compile-time the layouts of structures that are entirely function pointers (and have not been manually annotated with __no_randomize_layout), or structures that have been explicitly ma...Rule Medium Severity -
Poison kernel stack before returning from syscalls
This option makes the kernel erase the kernel stack before returning from system calls. This has the effect of leaving the stack initialized to the poison value, which both reduces the lifetime of ...Rule Medium Severity -
Force initialization of variables containing userspace addresses
While the kernel is built with warnings enabled for any missed stack variable initializations, this warning is silenced for anything passed by reference to another function, under the occasionally ...Rule Medium Severity -
zero-init everything passed by reference
Zero-initialize any stack variables that may be passed by reference and had not already been explicitly initialized. This configuration is available from kernel 4.14, but may be available if backpo...Rule Medium Severity -
Verify Group Who Owns /etc/ipsec.d Directory
To properly set the group owner of/etc/ipsec.d, run the command:$ sudo chgrp root /etc/ipsec.d
Rule Medium Severity -
Verify User Who Owns /etc/ipsec.d Directory
To properly set the owner of/etc/ipsec.d, run the command:$ sudo chown root /etc/ipsec.d
Rule Medium Severity -
Verify Permissions On /etc/ipsec.d Directory
To properly set the permissions of/etc/ipsec.d, run the command:$ sudo chmod 0700 /etc/ipsec.d
Rule Medium Severity -
Verify Group Who Owns /etc/ipsec.conf File
To properly set the group owner of/etc/ipsec.conf, run the command:$ sudo chgrp root /etc/ipsec.conf
Rule Medium Severity -
Verify Group Who Owns /etc/ipsec.secrets File
To properly set the group owner of/etc/ipsec.secrets, run the command:$ sudo chgrp root /etc/ipsec.secrets
Rule Medium Severity -
Verify User Who Owns /etc/ipsec.conf File
To properly set the owner of/etc/ipsec.conf, run the command:$ sudo chown root /etc/ipsec.conf
Rule Medium Severity
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