Vulnerability-Lookup

Vulnerability from bitnami_vulndb

Published

2024-03-06 10:52

Modified

2025-05-20 10:02

Summary

ReDoS vulnerability in parser_apache2

Details

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).

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Bitnami",
        "name": "fluentd",
        "purl": "pkg:bitnami/fluentd"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.14.14"
            },
            {
              "fixed": "1.14.2"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "severity": [
        {
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "type": "CVSS_V3"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2021-41186"
  ],
  "database_specific": {
    "cpes": [
      "cpe:2.3:a:fluentd:fluentd:*:*:*:*:*:*:*:*"
    ],
    "severity": "High"
  },
  "details": "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\u0027t 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).",
  "id": "BIT-fluentd-2021-41186",
  "modified": "2025-05-20T10:02:07.006Z",
  "published": "2024-03-06T10:52:03.183Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/fluent/fluentd/blob/master/CHANGELOG.md#v1142"
    },
    {
      "type": "WEB",
      "url": "https://github.com/fluent/fluentd/security/advisories/GHSA-hwhf-64mh-r662"
    },
    {
      "type": "WEB",
      "url": "https://github.com/github/securitylab-vulnerabilities/blob/52dc4a2a828c6dc24231967c2937ad92038184a9/vendor_reports/GHSL-2021-102-fluent-fluentd.md"
    },
    {
      "type": "WEB",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-41186"
    }
  ],
  "schema_version": "1.5.0",
  "summary": "ReDoS vulnerability in parser_apache2"
}

CVE-2021-41186 (GCVE-0-2021-41186)

Vulnerability from cvelistv5 – Published: 2021-10-29 13:40 – Updated: 2024-08-04 03:08

Title

ReDoS vulnerability in parser_apache2

Summary

Severity ?

5.9 (Medium)


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

CWE

CWE-400 - Uncontrolled Resource Consumption

Assigner

GitHub_M

References

URL

Tags

	https://github.com/fluent/fluentd/security/adviso…	x_refsource_CONFIRM
	https://github.com/fluent/fluentd/blob/master/CHA…	x_refsource_MISC
	https://github.com/github/securitylab-vulnerabili…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	fluent	fluentd	Affected: >= 0.14.14, < 1.14.2

Show details on NVD website

JSON

To clipboard

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          },
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          },
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            ],
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          }
        ],
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    ],
    "cna": {
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          "versions": [
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        {
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        }
      ],
      "metrics": [
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            "availabilityImpact": "HIGH",
            "baseScore": 5.9,
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            "confidentialityImpact": "NONE",
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      ],
      "providerMetadata": {
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        "discovery": "UNKNOWN"
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        },
        "affects": {
          "vendor": {
            "vendor_data": [
              {
                "product": {
                  "product_data": [
                    {
                      "product_name": "fluentd",
                      "version": {
                        "version_data": [
                          {
                            "version_value": "\u003e= 0.14.14, \u003c 1.14.2"
                          }
                        ]
                      }
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                  ]
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}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

Vulnerability from bitnami_vulndb

CVE-2021-41186 (GCVE-0-2021-41186)

Tags

Sightings

Nomenclature