rhsa-2021:0618
Vulnerability from csaf_redhat
Published
2021-02-22 10:29
Modified
2024-11-22 16:28
Summary
Red Hat Security Advisory: stunnel security update

Notes

Topic
An update for stunnel is now available for Red Hat Enterprise Linux 8. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details
Stunnel is a wrapper for network connections. It can be used to tunnel an unencrypted network connection over an encrypted connection (encrypted using SSL or TLS) or to provide an encrypted means of connecting to services that do not natively support encryption. Security Fix(es): * stunnel: client certificate not correctly verified when redirect and verifyChain options are used (CVE-2021-20230) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Terms of Use
This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.


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  "vulnerabilities": [
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      "cve": "CVE-2021-20230",
      "cwe": {
        "id": "CWE-295",
        "name": "Improper Certificate Validation"
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      "discovery_date": "2021-01-22T00:00:00+00:00",
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          "text": "A flaw was found in stunnel, 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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        },
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          "text": "stunnel: client certificate not correctly verified when redirect and verifyChain options are used",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This issue did not affect the versions of stunnel as shipped with Red Hat Enterprise Linux 5, 6, and 7 as they did not include support for the \"redirect\" option.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
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          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2021:0618"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "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"
          },
          "products": [
            "BaseOS-8.3.0.Z.MAIN:stunnel-0:5.56-5.el8_3.aarch64",
            "BaseOS-8.3.0.Z.MAIN:stunnel-0:5.56-5.el8_3.ppc64le",
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            "BaseOS-8.3.0.Z.MAIN:stunnel-debuginfo-0:5.56-5.el8_3.aarch64",
            "BaseOS-8.3.0.Z.MAIN:stunnel-debuginfo-0:5.56-5.el8_3.ppc64le",
            "BaseOS-8.3.0.Z.MAIN:stunnel-debuginfo-0:5.56-5.el8_3.s390x",
            "BaseOS-8.3.0.Z.MAIN:stunnel-debuginfo-0:5.56-5.el8_3.x86_64",
            "BaseOS-8.3.0.Z.MAIN:stunnel-debugsource-0:5.56-5.el8_3.aarch64",
            "BaseOS-8.3.0.Z.MAIN:stunnel-debugsource-0:5.56-5.el8_3.ppc64le",
            "BaseOS-8.3.0.Z.MAIN:stunnel-debugsource-0:5.56-5.el8_3.s390x",
            "BaseOS-8.3.0.Z.MAIN:stunnel-debugsource-0:5.56-5.el8_3.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "stunnel: client certificate not correctly verified when redirect and verifyChain options are used"
    }
  ]
}


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