cve-2021-41186
Vulnerability from cvelistv5
Published
2021-10-29 13:40
Modified
2024-08-04 03:08
Severity ?
5.9 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
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
security-advisories@github.comhttps://github.com/fluent/fluentd/blob/master/CHANGELOG.md#v1142Release Notes, Third Party Advisory
security-advisories@github.comhttps://github.com/fluent/fluentd/security/advisories/GHSA-hwhf-64mh-r662Third Party Advisory
security-advisories@github.comhttps://github.com/github/securitylab-vulnerabilities/blob/52dc4a2a828c6dc24231967c2937ad92038184a9/vendor_reports/GHSL-2021-102-fluent-fluentd.mdBroken Link
af854a3a-2127-422b-91ae-364da2661108https://github.com/fluent/fluentd/blob/master/CHANGELOG.md#v1142Release Notes, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/fluent/fluentd/security/advisories/GHSA-hwhf-64mh-r662Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/github/securitylab-vulnerabilities/blob/52dc4a2a828c6dc24231967c2937ad92038184a9/vendor_reports/GHSL-2021-102-fluent-fluentd.mdBroken Link
Impacted products
Vendor Product Version
fluent fluentd Version: >= 0.14.14, < 1.14.2
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