MEDIUM 5.9 RubyGems
ReDoS vulnerability in parser_apache2
GHSA-hwhf-64mh-r662 · BIT-fluentd-2021-41186 · CVE-2021-41186
Published · Modified
Description
Impact
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.
Patches
v1.14.2
Workarounds
Either of the following:
- Don't use parser_apache2 for parsing logs which cannot guarantee generated by Apache.
- Put patched version of parser_apache2.rb into /etc/fluent/plugin directory (or any other directories specified by the environment variable
FLUENT_PLUGINor--pluginoption of fluentd).
References
References
- WEB https://github.com/fluent/fluentd/security/advisories/GHSA-hwhf-64mh-r662
- ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2021-41186
- WEB https://github.com/fluent/fluentd/commit/5482a3d049dab351de0be68f4b4bc562319d8511
- PACKAGE https://github.com/fluent/fluentd
- WEB https://github.com/fluent/fluentd/blob/master/CHANGELOG.md#v1142
- WEB https://github.com/github/securitylab-vulnerabilities/blob/52dc4a2a828c6dc24231967c2937ad92038184a9/vendor_reports/GHSL-2021-102-fluent-fluentd.md
- WEB https://github.com/rubysec/ruby-advisory-db/blob/master/gems/fluentd/CVE-2021-41186.yml
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