ReDoS vulnerability in parser_apache2
Description
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).
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
fluentdRubyGems | >= 0.14.14, < 1.14.2 | 1.14.2 |
Affected products
5- osv-coords4 versionspkg:bitnami/fluentdpkg:gem/fluentdpkg:rpm/opensuse/ruby3.2-rubygem-fluentd&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/rubygem-fluentd&distro=openSUSE%20Tumbleweed
>= 0.14.14, < 1.14.2+ 3 more
- (no CPE)range: >= 0.14.14, < 1.14.2
- (no CPE)range: >= 0.14.14, < 1.14.2
- (no CPE)range: < 1.15.3-1.4
- (no CPE)range: < 1.14.4-1.1
- fluent/fluentdv5Range: >= 0.14.14, < 1.14.2
Patches
Vulnerability mechanics
References
7- github.com/advisories/GHSA-hwhf-64mh-r662ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2021-41186ghsaADVISORY
- github.com/fluent/fluentd/blob/master/CHANGELOG.mdghsax_refsource_MISCWEB
- github.com/fluent/fluentd/commit/5482a3d049dab351de0be68f4b4bc562319d8511ghsaWEB
- github.com/fluent/fluentd/security/advisories/GHSA-hwhf-64mh-r662ghsax_refsource_CONFIRMWEB
- github.com/github/securitylab-vulnerabilities/blob/52dc4a2a828c6dc24231967c2937ad92038184a9/vendor_reports/GHSL-2021-102-fluent-fluentd.mdghsax_refsource_MISCWEB
- github.com/rubysec/ruby-advisory-db/blob/master/gems/fluentd/CVE-2021-41186.ymlghsaWEB
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