Vulnerability Details 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).
Exploit prediction scoring system (EPSS) score
EPSS Score 0.005
EPSS Ranking 64.3%
CVSS Severity
CVSS v3 Score 5.9
CVSS v2 Score 5.0
References
- https://github.com/fluent/fluentd/blob/master/CHANGELOG.md#v1142
- 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
- https://github.com/fluent/fluentd/blob/master/CHANGELOG.md#v1142
- 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
Products affected by CVE-2021-41186
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cpe:2.3:a:fluentd:fluentd:0.14.14
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cpe:2.3:a:fluentd:fluentd:0.14.15
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cpe:2.3:a:fluentd:fluentd:0.14.16
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cpe:2.3:a:fluentd:fluentd:0.14.17
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cpe:2.3:a:fluentd:fluentd:0.14.18
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cpe:2.3:a:fluentd:fluentd:0.14.19
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cpe:2.3:a:fluentd:fluentd:0.14.20
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cpe:2.3:a:fluentd:fluentd:0.14.21
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cpe:2.3:a:fluentd:fluentd:0.14.22
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cpe:2.3:a:fluentd:fluentd:0.14.23
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cpe:2.3:a:fluentd:fluentd:0.14.24
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cpe:2.3:a:fluentd:fluentd:0.14.25
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cpe:2.3:a:fluentd:fluentd:1.0.0
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cpe:2.3:a:fluentd:fluentd:1.0.1
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cpe:2.3:a:fluentd:fluentd:1.0.2
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cpe:2.3:a:fluentd:fluentd:1.1.0
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cpe:2.3:a:fluentd:fluentd:1.1.1
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cpe:2.3:a:fluentd:fluentd:1.1.2
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cpe:2.3:a:fluentd:fluentd:1.1.3
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cpe:2.3:a:fluentd:fluentd:1.10.0
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cpe:2.3:a:fluentd:fluentd:1.10.1
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cpe:2.3:a:fluentd:fluentd:1.10.2
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cpe:2.3:a:fluentd:fluentd:1.10.3
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cpe:2.3:a:fluentd:fluentd:1.10.4
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cpe:2.3:a:fluentd:fluentd:1.11.0
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cpe:2.3:a:fluentd:fluentd:1.11.1
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cpe:2.3:a:fluentd:fluentd:1.11.2
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cpe:2.3:a:fluentd:fluentd:1.11.3
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cpe:2.3:a:fluentd:fluentd:1.11.4
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cpe:2.3:a:fluentd:fluentd:1.11.5
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cpe:2.3:a:fluentd:fluentd:1.12.0
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cpe:2.3:a:fluentd:fluentd:1.12.1
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cpe:2.3:a:fluentd:fluentd:1.12.2
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cpe:2.3:a:fluentd:fluentd:1.12.3
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cpe:2.3:a:fluentd:fluentd:1.12.4
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cpe:2.3:a:fluentd:fluentd:1.13.0
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cpe:2.3:a:fluentd:fluentd:1.13.1
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cpe:2.3:a:fluentd:fluentd:1.13.2
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cpe:2.3:a:fluentd:fluentd:1.13.3
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cpe:2.3:a:fluentd:fluentd:1.14.1
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cpe:2.3:a:fluentd:fluentd:1.2.0
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cpe:2.3:a:fluentd:fluentd:1.2.1
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cpe:2.3:a:fluentd:fluentd:1.2.2
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cpe:2.3:a:fluentd:fluentd:1.2.3
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cpe:2.3:a:fluentd:fluentd:1.2.4
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cpe:2.3:a:fluentd:fluentd:1.2.5
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cpe:2.3:a:fluentd:fluentd:1.2.6
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cpe:2.3:a:fluentd:fluentd:1.3.0
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cpe:2.3:a:fluentd:fluentd:1.3.1
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cpe:2.3:a:fluentd:fluentd:1.3.2
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cpe:2.3:a:fluentd:fluentd:1.3.3
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cpe:2.3:a:fluentd:fluentd:1.4.0
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cpe:2.3:a:fluentd:fluentd:1.4.1
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cpe:2.3:a:fluentd:fluentd:1.4.2
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cpe:2.3:a:fluentd:fluentd:1.5.0
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cpe:2.3:a:fluentd:fluentd:1.5.1
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cpe:2.3:a:fluentd:fluentd:1.5.2
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cpe:2.3:a:fluentd:fluentd:1.6.0
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cpe:2.3:a:fluentd:fluentd:1.6.1
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cpe:2.3:a:fluentd:fluentd:1.6.2
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cpe:2.3:a:fluentd:fluentd:1.6.3
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cpe:2.3:a:fluentd:fluentd:1.7.0
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cpe:2.3:a:fluentd:fluentd:1.7.1
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cpe:2.3:a:fluentd:fluentd:1.7.2
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cpe:2.3:a:fluentd:fluentd:1.7.3
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cpe:2.3:a:fluentd:fluentd:1.7.4
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cpe:2.3:a:fluentd:fluentd:1.8.0
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cpe:2.3:a:fluentd:fluentd:1.8.1
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cpe:2.3:a:fluentd:fluentd:1.9.0
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cpe:2.3:a:fluentd:fluentd:1.9.1
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cpe:2.3:a:fluentd:fluentd:1.9.2
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cpe:2.3:a:fluentd:fluentd:1.9.3