CVE-2021-41186

Source

https://nvd.nist.gov/vuln/detail/CVE-2021-41186

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-41186.json

Aliases

• BIT-fluentd-2021-41186
• GHSA-hwhf-64mh-r662

Withdrawn

2024-05-15T05:34:00.098766Z

Published

2021-10-29T14:15:07Z

Modified

2023-12-06T01:01:33.325970Z

Summary

[none]

Details

Fluentd collects events from various data sources and writes them to files to help unify logging infrastructure. The parserapache2 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 parserapache2 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://github.com/fluent/fluentd/security/advisories/GHSA-hwhf-64mh-r662
• 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