ghsa-cfcf-x7x2-gpf8
Vulnerability from github
Published
2021-12-17 00:00
Modified
2025-11-03 21:30
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Details

An issue was discovered in Suricata before 6.0.4. It is possible to bypass/evade any HTTP-based signature by faking an RST TCP packet with random TCP options of the md5header from the client side. After the three-way handshake, it's possible to inject an RST ACK with a random TCP md5header option. Then, the client can send an HTTP GET request with a forbidden URL. The server will ignore the RST ACK and send the response HTTP packet for the client's request. These packets will not trigger a Suricata reject action.

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{
  "affected": [],
  "aliases": [
    "CVE-2021-45098"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2021-12-16T05:15:00Z",
    "severity": "HIGH"
  },
  "details": "An issue was discovered in Suricata before 6.0.4. It is possible to bypass/evade any HTTP-based signature by faking an RST TCP packet with random TCP options of the md5header from the client side. After the three-way handshake, it\u0027s possible to inject an RST ACK with a random TCP md5header option. Then, the client can send an HTTP GET request with a forbidden URL. The server will ignore the RST ACK and send the response HTTP packet for the client\u0027s request. These packets will not trigger a Suricata reject action.",
  "id": "GHSA-cfcf-x7x2-gpf8",
  "modified": "2025-11-03T21:30:36Z",
  "published": "2021-12-17T00:00:32Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-45098"
    },
    {
      "type": "WEB",
      "url": "https://github.com/OISF/suricata/commit/50e2b973eeec7172991bf8f544ab06fb782b97df"
    },
    {
      "type": "WEB",
      "url": "https://forum.suricata.io/t/suricata-6-0-4-and-5-0-8-released/1942"
    },
    {
      "type": "WEB",
      "url": "https://github.com/OISF/suricata/releases"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00029.html"
    },
    {
      "type": "WEB",
      "url": "https://redmine.openinfosecfoundation.org/issues/4710"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    }
  ]
}


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