Resource Exhaustion Affecting fluentd package, versions *


Severity

Recommended
0.0
medium
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
2.22% (82nd percentile)

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  • Snyk IDSNYK-RHEL7-FLUENTD-5259384
  • published27 Mar 2023
  • disclosed29 Oct 2021

Introduced: 29 Oct 2021

CVE-2021-41186  (opens in a new tab)
CWE-400  (opens in a new tab)

How to fix?

There is no fixed version for RHEL:7 fluentd.

NVD Description

Note: Versions mentioned in the description apply only to the upstream fluentd package and not the fluentd package as distributed by RHEL. See How to fix? for RHEL:7 relevant fixed versions and status.

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).

CVSS Base Scores

version 3.1