rh#2019184

Fluentd collects events from various data sources and writes them to files to
help unify logging infrastructure. The parser_apache2 plugin in Fluentd
v0.14.14 to v1.14.1 suffers from a regular expression denial of service (ReDoS)
vulnerability. A broken apache log with a certain pattern of string can spend
too much time in a regular expression, resulting in the potential for a DoS
attack. This issue is patched in version 1.14.2 There are two workarounds
available. Either don't use parser_apache2 for parsing logs (which cannot
guarantee generated by Apache), or put patched version of parser_apache2.rb
into /etc/fluent/plugin directory (or any other directories specified by the
environment variable `FLUENT_PLUGIN` or `--plugin` option of fluentd).

References:
https://bugzilla.redhat.com/show_bug.cgi?id=2019184
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-41186
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-41186
https://github.com/fluent/fluentd/blob/master/CHANGELOG.md#v1142
https://github.com/github/securitylab-vulnerabilities/blob/52dc4a2a828c6dc24231967c2937ad92038184a9/vendor_reports/GHSL-2021-102-fluent-fluentd.md
https://github.com/fluent/fluentd/security/advisories/GHSA-hwhf-64mh-r662