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DescriptionChinmay Paradkar
2017-10-16 19:54:00 UTC
Description of problem:
The OVAL evaluates runtime and persistent configurations together. The
OVAL content currently does not evaluate for default values in the
sysctl config files -- it probably should.
Version-Release number of selected component (if applicable):
openscap-1.2.14-2.el7.x86_64
Additional info:
When doing a openscap validation of Title "Enable Randomized Layout of Virtual Address Space" we are getting a fail but it should be a pass result.
Using the C2S openscap profile for RedHat 7 Linux, we are expected a PASS, but instead are getting a FAIL result code from the OpenScap scan.
Title: Enable Randomized Layout of Virtual Address Space
ID: content_rule_sysctl_kernel_randomize_va_space
TYPE: xccdf:Rule
Looking at the actual system:
[root host ~]# sysctl -a | grep -i -e randomize
kernel.randomize_va_space = 2
sysctl: reading key "net.ipv6.conf.all.stable_secret"
sysctl: reading key "net.ipv6.conf.default.stable_secret"
sysctl: reading key "net.ipv6.conf.ens192.stable_secret"
sysctl: reading key "net.ipv6.conf.lo.stable_secret"
[root host ~]#
There is no entry in sysctl.conf that would override:
[root host ~]# grep -i -e randomize /etc/sysctl.conf
[root host ~]#
We would therefore expect a PASS.
The rule "Enable Randomized Layout of Virtual Address Space" checks both runtime state and configuration. The rule requires both checks to pass.
The runtime check reads 'kernel.randomize_va_space' paramater from sysctl and requires it to have value of 2.
The configuration check requires that kernel.randomize_va_space is set to 2 in at least one of configuration files in these paths /etc/sysctl.conf, /etc/sysctl.d/*.conf, /run/sysctl.d/*.conf, /usr/lib/sysctl.d/*.conf
One problem that I see is that value 2 is default, so people don't have to specify this parameter in their config files. I think we shouldn't check if it is set to 2 in configuration file, but we should check if somebody haven't explicitely changed the value to 0 or 1. See https://access.redhat.com/solutions/44460.
As you correctly pointed out, in this rule we mix runtime check with configuration checks. The problem that I see is that some other rules check only persistent configuration. I find this very confusing. We should define what the rules are supposed to check and be consistent across all rules in benchmarks.
Comment 4Watson Yuuma Sato
2018-03-26 18:25:27 UTC
The reported problem is a duplicate of referenced bugzilla.
*** This bug has been marked as a duplicate of bug 1494606 ***