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[email protected]CVE-2021-41186

HistoryOct 29, 2021 - 2:15 p.m.

CVE-2021-41186

2021-10-2914:15:07

CWE-400

[email protected]

web.nvd.nist.gov

173

fluentd

cve-2021-41186

parser_apache2

redos vulnerability

dos attack

nvd

security patch

5 Medium

CVSS2

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

PARTIAL

AV:N/AC:L/Au:N/C:N/I:N/A:P

7.5 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

0.001 Low

EPSS

Percentile

47.4%

JSON

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).

Affected configurations

Vulners

NVD

Node

fluentfluentdRange0.14.14–1.14.2

CPENameOperatorVersion
fluentd:fluentdfluentdle1.14.1

CPE	Name	Operator	Version
fluentd:fluentd	fluentd	le	1.14.1

CNA Affected

[
  {
    "product": "fluentd",
    "vendor": "fluent",
    "versions": [
      {
        "status": "affected",
        "version": ">= 0.14.14, < 1.14.2"
      }
    ]
  }
]