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Description of problem:

There is a bug with comparing attribiute references and expansions, which causes the comparison to always return false. 

This has been already reported and fixed upstream over a year ago:  
https://github.com/FreeRADIUS/freeradius-server/issues/1947
https://github.com/FreeRADIUS/freeradius-server/commit/e56048c98bfab25ae9453a52bbe6bcc02f20f515

Version-Release number of selected component (if applicable):
Tested with freeradius-3.0.13-9.el7_5.x86_64, other versions are likely affected as well

How reproducible:

Here is an example condition which works fine with freeradius shipped with RHEL6, but always fails on RHEL7:

if ( LDAP-Group == "%{sql: SELECT authorized_group FROM nas WHERE
nasname = '%{Packet-Src-IP-Address}' LIMIT 1}" )

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (Moderate: freeradius security and bug fix update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2020:3984