rhsa-2021_1063
Vulnerability from csaf_redhat
Published
2021-04-05 13:48
Modified
2024-09-13 20:25
Summary
Red Hat Security Advisory: openssl security update

Notes

Topic
An update for openssl is now available for Red Hat Enterprise Linux 8.2 Extended Update Support. 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
OpenSSL is a toolkit that implements the Secure Sockets Layer (SSL) and Transport Layer Security (TLS) protocols, as well as a full-strength general-purpose cryptography library. Security Fix(es): * openssl: NULL pointer dereference in signature_algorithms processing (CVE-2021-3449) 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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          "text": "A flaw was found in openssl. A server crash and denial of service attack could occur if a client sends a TLSv1.2 renegotiation ClientHello and omits the signature_algorithms extension but includes a signature_algorithms_cert extension. The highest threat from this vulnerability is to system availability.",
          "title": "Vulnerability description"
        },
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          "category": "summary",
          "text": "openssl: NULL pointer dereference in signature_algorithms processing",
          "title": "Vulnerability summary"
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        {
          "category": "other",
          "text": "This flaw only affects OpenSSL 1.1.1, older versions are not affected.",
          "title": "Statement"
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        {
          "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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      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2021-3449"
        },
        {
          "category": "external",
          "summary": "RHBZ#1941554",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1941554"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2021-3449",
          "url": "https://www.cve.org/CVERecord?id=CVE-2021-3449"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2021-3449",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-3449"
        },
        {
          "category": "external",
          "summary": "https://www.openssl.org/news/secadv/20210325.txt",
          "url": "https://www.openssl.org/news/secadv/20210325.txt"
        }
      ],
      "release_date": "2021-03-25T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nFor the update to take effect, all services linked to the OpenSSL library must be restarted, or the system rebooted.",
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            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 5.9,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
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      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "openssl: NULL pointer dereference in signature_algorithms processing"
    }
  ]
}


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