gsd-2021-41186
Vulnerability from gsd
Modified
2021-11-01 00:00
Details
### Impact 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. ### Patches v1.14.2 ### Workarounds Either of the following: * Don't use parser_apache2 for parsing logs which cannot guarantee generated by Apache. * 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).
Aliases
Aliases
CVE-2021-41186


To clipboard 

{
  "GSD": {
    "alias": "CVE-2021-41186",
    "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\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": "GSD-2021-41186",
    "references": [
      "https://www.suse.com/security/cve/CVE-2021-41186.html"
    ]
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "affected": [
        {
          "package": {
            "ecosystem": "RubyGems",
            "name": "fluentd",
            "purl": "pkg:gem/fluentd"
          }
        }
      ],
      "aliases": [
        "CVE-2021-41186",
        "GHSA-hwhf-64mh-r662"
      ],
      "details": "### Impact\nparser_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.\n\n### Patches\nv1.14.2\n\n### Workarounds\nEither of the following:\n\n* Don\u0027t use parser_apache2 for parsing logs which cannot guarantee generated by Apache.\n* 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).\n",
      "id": "GSD-2021-41186",
      "modified": "2021-11-01T00:00:00.000Z",
      "published": "2021-11-01T00:00:00.000Z",
      "references": [
        {
          "type": "WEB",
          "url": "https://github.com/fluent/fluentd/security/advisories/GHSA-hwhf-64mh-r662"
        },
        {
          "type": "WEB",
          "url": "https://securitylab.github.com/advisories/GHSL-2021-102-fluent-fluentd/"
        },
        {
          "type": "WEB",
          "url": "https://github.com/fluent/fluentd/blob/master/CHANGELOG.md#v1142"
        }
      ],
      "schema_version": "1.4.0",
      "severity": [
        {
          "score": 5.9,
          "type": "CVSS_V3"
        }
      ],
      "summary": "ReDoS vulnerability in parser_apache2"
    }
  },
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        "ID": "CVE-2021-41186",
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            "value": "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)."
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          "baseScore": 5.9,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
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          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
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      "references": {
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          },
          {
            "name": "https://github.com/fluent/fluentd/blob/master/CHANGELOG.md#v1142",
            "refsource": "MISC",
            "url": "https://github.com/fluent/fluentd/blob/master/CHANGELOG.md#v1142"
          },
          {
            "name": "https://github.com/github/securitylab-vulnerabilities/blob/52dc4a2a828c6dc24231967c2937ad92038184a9/vendor_reports/GHSL-2021-102-fluent-fluentd.md",
            "refsource": "MISC",
            "url": "https://github.com/github/securitylab-vulnerabilities/blob/52dc4a2a828c6dc24231967c2937ad92038184a9/vendor_reports/GHSL-2021-102-fluent-fluentd.md"
          }
        ]
      },
      "source": {
        "advisory": "GHSA-hwhf-64mh-r662",
        "discovery": "UNKNOWN"
      }
    },
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      "cve": "2021-41186",
      "cvss_v3": 5.9,
      "date": "2021-11-01",
      "description": "### Impact\nparser_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.\n\n### Patches\nv1.14.2\n\n### Workarounds\nEither of the following:\n\n* Don\u0027t use parser_apache2 for parsing logs which cannot guarantee generated by Apache.\n* 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).\n",
      "gem": "fluentd",
      "ghsa": "hwhf-64mh-r662",
      "patched_versions": [
        "\u003e= 1.14.2"
      ],
      "related": {
        "url": [
          "https://securitylab.github.com/advisories/GHSL-2021-102-fluent-fluentd/",
          "https://github.com/fluent/fluentd/blob/master/CHANGELOG.md#v1142"
        ]
      },
      "title": "ReDoS vulnerability in parser_apache2",
      "unaffected_versions": [
        "\u003c 0.14.14"
      ],
      "url": "https://github.com/fluent/fluentd/security/advisories/GHSA-hwhf-64mh-r662"
    },
    "gitlab.com": {
      "advisories": [
        {
          "affected_range": "\u003e=0.14.14 \u003c=1.14.1",
          "affected_versions": "All versions starting from 0.14.14 up to 1.14.1",
          "cvss_v2": "AV:N/AC:L/Au:N/C:N/I:N/A:P",
          "cvss_v3": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "cwe_ids": [
            "CWE-1035",
            "CWE-400",
            "CWE-937"
          ],
          "date": "2021-11-03",
          "description": "Fluentd collects events from various data sources and writes them to files to help unify logging infrastructure. The `parser_apache2` plugin in Fluentd 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. 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).",
          "fixed_versions": [
            "1.14.2"
          ],
          "identifier": "CVE-2021-41186",
          "identifiers": [
            "CVE-2021-41186",
            "GHSA-hwhf-64mh-r662"
          ],
          "not_impacted": "All versions before 0.14.14, all versions after 1.14.1",
          "package_slug": "gem/fluentd",
          "pubdate": "2021-10-29",
          "solution": "Upgrade to version 1.14.2 or above.",
          "title": "Uncontrolled Resource Consumption",
          "urls": [
            "https://nvd.nist.gov/vuln/detail/CVE-2021-41186",
            "https://github.com/fluent/fluentd/blob/master/CHANGELOG.md#v1142",
            "https://github.com/github/securitylab-vulnerabilities/blob/52dc4a2a828c6dc24231967c2937ad92038184a9/vendor_reports/GHSL-2021-102-fluent-fluentd.md",
            "https://github.com/fluent/fluentd/security/advisories/GHSA-hwhf-64mh-r662"
          ],
          "uuid": "2da0ec89-7e7d-4102-9fb3-951e13275888"
        }
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                "versionEndIncluding": "1.14.1",
                "versionStartIncluding": "0.14.14",
                "vulnerable": true
              }
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      "impact": {
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          "acInsufInfo": false,
          "cvssV2": {
            "accessComplexity": "LOW",
            "accessVector": "NETWORK",
            "authentication": "NONE",
            "availabilityImpact": "PARTIAL",
            "baseScore": 5.0,
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P",
            "version": "2.0"
          },
          "exploitabilityScore": 10.0,
          "impactScore": 2.9,
          "obtainAllPrivilege": false,
          "obtainOtherPrivilege": false,
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          "userInteractionRequired": false
        },
        "baseMetricV3": {
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            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
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          "impactScore": 3.6
        }
      },
      "lastModifiedDate": "2021-11-03T00:11Z",
      "publishedDate": "2021-10-29T14:15Z"
    }
  }
}


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