Vulnerability Database
289,784
Total vulnerabilities in the database
CVE-2021-41186
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).
| Software | From | Fixed in |
|---|---|---|
| fluentd / fluentd | 0.14.14 | 1.14.1.x |
fluentd
|
0.14.14 | 1.14.2 |
- https://github.com/fluent/fluentd/blob/master/CHANGELOG.md#v1142
- https://github.com/fluent/fluentd/commit/5482a3d049dab351de0be68f4b4bc562319d8511
- https://github.com/fluent/fluentd/security/advisories/GHSA-hwhf-64mh-r662
- https://github.com/github/securitylab-vulnerabilities/blob/52dc4a2a828c6dc24231967c2937ad92038184a9/vendor_reports/GHSL-2021-102-fluent-fluentd.md