CVE-2021-41186 – fluentd

Package

Manager: gem
Name: fluentd
Vulnerable Version: >=0.14.14 <1.14.2

Severity

Level: Medium

CVSS v3.1: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v4.0: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

EPSS: 0.00486 pctl0.64386

Details

ReDoS vulnerability in parser_apache2 ### 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_PLUGIN` or `--plugin` option of fluentd). ### References * [CVE-2021-41186](http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-41186) * [GHSA-hwhf-64mh-r662](https://github.com/fluent/fluentd/security/advisories/GHSA-hwhf-64mh-r662) * [GHSL-2021-102](https://securitylab.github.com/advisories/GHSL-2021-102-fluent-fluentd/) * https://github.com/fluent/fluentd/blob/master/CHANGELOG.md#v1142

Metadata

Created: 2021-11-01T19:16:31Z
Modified: 2021-11-04T17:05:51Z
Source: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/11/GHSA-hwhf-64mh-r662/GHSA-hwhf-64mh-r662.json
CWE IDs: ["CWE-400"]
Alternative ID: GHSA-hwhf-64mh-r662
Finding: F002
Auto approve: 1