GSD-2021-20230

Vulnerability from gsd - Updated: 2023-12-13 01:23
Details
A flaw was found in stunnel before 5.57, where it improperly validates client certificates when it is configured to use both redirect and verifyChain options. This flaw allows an attacker with a certificate signed by a Certificate Authority, which is not the one accepted by the stunnel server, to access the tunneled service instead of being redirected to the address specified in the redirect option. The highest threat from this vulnerability is to confidentiality.
Aliases
Aliases
CVE-2021-20230
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{
  "GSD": {
    "alias": "CVE-2021-20230",
    "description": "A flaw was found in stunnel before 5.57, where it improperly validates client certificates when it is configured to use both redirect and verifyChain options. This flaw allows an attacker with a certificate signed by a Certificate Authority, which is not the one accepted by the stunnel server, to access the tunneled service instead of being redirected to the address specified in the redirect option. The highest threat from this vulnerability is to confidentiality.",
    "id": "GSD-2021-20230",
    "references": [
      "https://www.suse.com/security/cve/CVE-2021-20230.html",
      "https://access.redhat.com/errata/RHSA-2021:0620",
      "https://access.redhat.com/errata/RHSA-2021:0619",
      "https://access.redhat.com/errata/RHSA-2021:0618",
      "https://advisories.mageia.org/CVE-2021-20230.html",
      "https://linux.oracle.com/cve/CVE-2021-20230.html"
    ]
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2021-20230"
      ],
      "details": "A flaw was found in stunnel before 5.57, where it improperly validates client certificates when it is configured to use both redirect and verifyChain options. This flaw allows an attacker with a certificate signed by a Certificate Authority, which is not the one accepted by the stunnel server, to access the tunneled service instead of being redirected to the address specified in the redirect option. The highest threat from this vulnerability is to confidentiality.",
      "id": "GSD-2021-20230",
      "modified": "2023-12-13T01:23:11.889643Z",
      "schema_version": "1.4.0"
    }
  },
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        "ID": "CVE-2021-20230",
        "STATE": "PUBLIC"
      },
      "affects": {
        "vendor": {
          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "stunnel",
                    "version": {
                      "version_data": [
                        {
                          "version_value": "stunnel 5.57"
                        }
                      ]
                    }
                  }
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              },
              "vendor_name": "n/a"
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          }
        ]
      },
      "problemtype": {
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          {
            "description": [
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                "value": "CWE-295"
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      "references": {
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            "refsource": "MISC",
            "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1925226"
          },
          {
            "name": "https://github.com/mtrojnar/stunnel/commit/ebad9ddc4efb2635f37174c9d800d06206f1edf9",
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            "url": "https://github.com/mtrojnar/stunnel/commit/ebad9ddc4efb2635f37174c9d800d06206f1edf9"
          },
          {
            "name": "GLSA-202105-02",
            "refsource": "GENTOO",
            "url": "https://security.gentoo.org/glsa/202105-02"
          }
        ]
      }
    },
    "nvd.nist.gov": {
      "configurations": {
        "CVE_data_version": "4.0",
        "nodes": [
          {
            "children": [],
            "cpe_match": [
              {
                "cpe23Uri": "cpe:2.3:a:stunnel:stunnel:*:*:*:*:*:*:*:*",
                "cpe_name": [],
                "versionEndExcluding": "5.57",
                "vulnerable": true
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              "value": "A flaw was found in stunnel before 5.57, where it improperly validates client certificates when it is configured to use both redirect and verifyChain options. This flaw allows an attacker with a certificate signed by a Certificate Authority, which is not the one accepted by the stunnel server, to access the tunneled service instead of being redirected to the address specified in the redirect option. The highest threat from this vulnerability is to confidentiality."
            }
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              "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1925226"
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      },
      "impact": {
        "baseMetricV2": {
          "acInsufInfo": false,
          "cvssV2": {
            "accessComplexity": "LOW",
            "accessVector": "NETWORK",
            "authentication": "NONE",
            "availabilityImpact": "NONE",
            "baseScore": 5.0,
            "confidentialityImpact": "PARTIAL",
            "integrityImpact": "NONE",
            "vectorString": "AV:N/AC:L/Au:N/C:P/I:N/A:N",
            "version": "2.0"
          },
          "exploitabilityScore": 10.0,
          "impactScore": 2.9,
          "obtainAllPrivilege": false,
          "obtainOtherPrivilege": false,
          "obtainUserPrivilege": false,
          "severity": "MEDIUM",
          "userInteractionRequired": false
        },
        "baseMetricV3": {
          "cvssV3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
            "version": "3.1"
          },
          "exploitabilityScore": 3.9,
          "impactScore": 3.6
        }
      },
      "lastModifiedDate": "2022-06-01T18:05Z",
      "publishedDate": "2021-02-23T17:15Z"
    }
  }
}


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  • 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.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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