{
"id": "GHSA-hwhf-64mh-r662",
"aliases": [
"CVE-2021-41186"
],
"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't 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\n### References\n* [CVE-2021-41186](http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-41186)\n* [GHSA-hwhf-64mh-r662](https://github.com/fluent/fluentd/security/advisories/GHSA-hwhf-64mh-r662)\n* [GHSL-2021-102](https://securitylab.github.com/advisories/GHSL-2021-102-fluent-fluentd/)\n* https://github.com/fluent/fluentd/blob/master/CHANGELOG.md#v1142\n",
"summary": "ReDoS vulnerability in parser_apache2",
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0.14.14"
},
{
"fixed": "1.14.2"
}
]
}
],
"package": {
"name": "fluentd",
"ecosystem": "RubyGems"
}
}
],
"modified": "2021-11-04T17:05:51Z",
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"
}
],
"published": "2021-11-01T19:16:31Z",
"references": [
{
"url": "https://github.com/fluent/fluentd/security/advisories/GHSA-hwhf-64mh-r662",
"type": "WEB"
},
{
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-41186",
"type": "ADVISORY"
},
{
"url": "https://github.com/fluent/fluentd/commit/5482a3d049dab351de0be68f4b4bc562319d8511",
"type": "WEB"
},
{
"url": "https://github.com/fluent/fluentd",
"type": "PACKAGE"
},
{
"url": "https://github.com/fluent/fluentd/blob/master/CHANGELOG.md#v1142",
"type": "WEB"
},
{
"url": "https://github.com/github/securitylab-vulnerabilities/blob/52dc4a2a828c6dc24231967c2937ad92038184a9/vendor_reports/GHSL-2021-102-fluent-fluentd.md",
"type": "WEB"
},
{
"url": "https://github.com/rubysec/ruby-advisory-db/blob/master/gems/fluentd/CVE-2021-41186.yml",
"type": "WEB"
}
],
"schema_version": "1.4.0",
"database_specific": {
"cwe_ids": [
"CWE-400"
],
"severity": "MODERATE",
"github_reviewed": true,
"nvd_published_at": "2021-10-29T14:15:00Z",
"github_reviewed_at": "2021-10-29T13:44:13Z"
}
}