gsd-2021-22890
Vulnerability from gsd
Modified
2023-12-13 01:23
Details
curl 7.63.0 to and including 7.75.0 includes vulnerability that allows a malicious HTTPS proxy to MITM a connection due to bad handling of TLS 1.3 session tickets. When using a HTTPS proxy and TLS 1.3, libcurl can confuse session tickets arriving from the HTTPS proxy but work as if they arrived from the remote server and then wrongly "short-cut" the host handshake. When confusing the tickets, a HTTPS proxy can trick libcurl to use the wrong session ticket resume for the host and thereby circumvent the server TLS certificate check and make a MITM attack to be possible to perform unnoticed. Note that such a malicious HTTPS proxy needs to provide a certificate that curl will accept for the MITMed server for an attack to work - unless curl has been told to ignore the server certificate check.
Aliases
Aliases
CVE-2021-22890


To clipboard 

{
  "GSD": {
    "alias": "CVE-2021-22890",
    "description": "curl 7.63.0 to and including 7.75.0 includes vulnerability that allows a malicious HTTPS proxy to MITM a connection due to bad handling of TLS 1.3 session tickets. When using a HTTPS proxy and TLS 1.3, libcurl can confuse session tickets arriving from the HTTPS proxy but work as if they arrived from the remote server and then wrongly \"short-cut\" the host handshake. When confusing the tickets, a HTTPS proxy can trick libcurl to use the wrong session ticket resume for the host and thereby circumvent the server TLS certificate check and make a MITM attack to be possible to perform unnoticed. Note that such a malicious HTTPS proxy needs to provide a certificate that curl will accept for the MITMed server for an attack to work - unless curl has been told to ignore the server certificate check.",
    "id": "GSD-2021-22890",
    "references": [
      "https://www.suse.com/security/cve/CVE-2021-22890.html",
      "https://www.debian.org/security/2021/dsa-4881",
      "https://access.redhat.com/errata/RHSA-2021:2472",
      "https://access.redhat.com/errata/RHSA-2021:2471",
      "https://ubuntu.com/security/CVE-2021-22890",
      "https://advisories.mageia.org/CVE-2021-22890.html",
      "https://security.archlinux.org/CVE-2021-22890"
    ]
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2021-22890"
      ],
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      "id": "GSD-2021-22890",
      "modified": "2023-12-13T01:23:24.232324Z",
      "schema_version": "1.4.0"
    }
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          "cwe_ids": [
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            "CWE-290",
            "CWE-937"
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          "date": "2022-04-06",
          "description": "curl to and including includes vulnerability that allows a malicious HTTPS proxy to MITM a connection due to bad handling of TLS session tickets. When using a HTTPS proxy and TLS, libcurl can confuse session tickets arriving from the HTTPS proxy but work as if they arrived from the remote server and then wrongly \"short-cut\" the host handshake. When confusing the tickets, a HTTPS proxy can trick libcurl to use the wrong session ticket resume for the host and thereby circumvent the server TLS certificate check and make a MITM attack to be possible to perform unnoticed. Note that such a malicious HTTPS proxy needs to provide a certificate that curl will accept for the MITMed server for an attack to work - unless curl has been told to ignore the server certificate check.",
          "fixed_versions": [
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          ],
          "identifier": "CVE-2021-22890",
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          "not_impacted": "All versions before 7.63.0, all versions after 7.75.0",
          "package_slug": "conan/libcurl",
          "pubdate": "2021-04-01",
          "solution": "Upgrade to version 7.76.0 or above.",
          "title": "Authentication Bypass by Spoofing",
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          },
          {
            "lang": "es",
            "value": "curl  versiones 7.63.0 hasta 7.75.0 incluy\u00e9ndola, incluye una vulnerabilidad que permite que un proxy HTTPS malicioso acceda a una conexi\u00f3n MITM debido al manejo inapropiado de los tickets de sesi\u00f3n de TLS versi\u00f3n 1.3.\u0026#xa0;Cuando se usa un proxy HTTPS y TLS 1.3, libcurl puede confundir los tickets de sesi\u00f3n que llegan del proxy HTTPS pero funciona como si llegaran del servidor remoto y luego \"short-cut\" incorrectamente el protocolo de enlace del host.\u0026#xa0;Al confundir los tickets, un proxy HTTPS puede enga\u00f1ar a libcurl para que utilice la reanudaci\u00f3n del ticket de sesi\u00f3n incorrecta para el host y, por lo tanto, omitir la verificaci\u00f3n del certificado TLS del servidor y hacer que un ataque MITM sea posible de realizar sin ser detectado.\u0026#xa0;Tome en cuenta que dicho proxy HTTPS malicioso debe proporcionar un certificado que curl aceptar\u00e1 para el servidor MITMed para que funcione un ataque, a menos que se le haya dicho a curl que ignore la verificaci\u00f3n del certificado del servidor."
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        "id": "CVE-2021-22890",
        "lastModified": "2024-03-27T15:47:45.160",
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              "acInsufInfo": false,
              "baseSeverity": "MEDIUM",
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                "accessComplexity": "MEDIUM",
                "accessVector": "NETWORK",
                "authentication": "NONE",
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  }
}


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