rhsa-2021_4932
Vulnerability from csaf_redhat
Published
2021-12-06 08:55
Modified
2024-11-06 00:12
Summary
Red Hat Security Advisory: nss security update

Notes

Topic
An update for nss is now available for Red Hat Enterprise Linux 7.4 Advanced Update Support. Red Hat Product Security has rated this update as having a security impact of Critical. 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
Network Security Services (NSS) is a set of libraries designed to support the cross-platform development of security-enabled client and server applications. Security Fix(es): * nss: Memory corruption in decodeECorDsaSignature with DSA signatures (and RSA-PSS) (CVE-2021-43527) 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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          "name": "nss-tools-0:3.28.4-18.el7_4.x86_64 as a component of Red Hat Enterprise Linux Server Optional AUS (v. 7.4)",
          "product_id": "7Server-optional-7.4.AUS:nss-tools-0:3.28.4-18.el7_4.x86_64"
        },
        "product_reference": "nss-tools-0:3.28.4-18.el7_4.x86_64",
        "relates_to_product_reference": "7Server-optional-7.4.AUS"
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    ]
  },
  "vulnerabilities": [
    {
      "acknowledgments": [
        {
          "names": [
            "Tavis Ormandy"
          ],
          "organization": "Project Zero"
        },
        {
          "names": [
            "the Mozilla project"
          ],
          "summary": "Acknowledged by upstream."
        }
      ],
      "cve": "CVE-2021-43527",
      "cwe": {
        "id": "CWE-120",
        "name": "Buffer Copy without Checking Size of Input (\u0027Classic Buffer Overflow\u0027)"
      },
      "discovery_date": "2021-11-17T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2024370"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A remote code execution flaw was found in the way NSS verifies certificates. This flaw allows an attacker posing as an SSL/TLS server to trigger this issue in a client application compiled with NSS when it tries to initiate an SSL/TLS connection.  Similarly, a server application compiled with NSS, which processes client certificates, can receive a malicious certificate via a client, triggering the flaw. The highest threat to this vulnerability is confidentiality, integrity, as well as system availability.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "nss: Memory corruption in decodeECorDsaSignature with DSA signatures (and RSA-PSS)",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "The issue is not limited to TLS. Any applications that use NSS certificate verification are vulnerable; S/MIME is impacted as well.  Similarly, a server application compiled with NSS, which processes client certificates, can receive a malicious certificate via a client.\n\nFirefox is not vulnerable to this flaw as it uses the mozilla::pkix for certificate verification. Thunderbird is affected when parsing email with the S/MIME signature.  Thunderbird on Red Hat Enterprise Linux 8.4 and later does not need to be updated since it uses the system NSS library, but earlier Red Hat Enterprise Linux 8 extended life streams will need to update Thunderbird as well as NSS.",
          "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"
        }
      ],
      "product_status": {
        "fixed": [
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          "7Server-optional-7.4.AUS:nss-tools-0:3.28.4-18.el7_4.x86_64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2021-43527"
        },
        {
          "category": "external",
          "summary": "RHBZ#2024370",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2024370"
        },
        {
          "category": "external",
          "summary": "RHSB-2021-008",
          "url": "https://access.redhat.com/security/vulnerabilities/RHSB-2021-008"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2021-43527",
          "url": "https://www.cve.org/CVERecord?id=CVE-2021-43527"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2021-43527",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-43527"
        },
        {
          "category": "external",
          "summary": "https://googleprojectzero.blogspot.com/2021/12/this-shouldnt-have-happened.html",
          "url": "https://googleprojectzero.blogspot.com/2021/12/this-shouldnt-have-happened.html"
        },
        {
          "category": "external",
          "summary": "https://www.mozilla.org/en-US/security/advisories/mfsa2021-51/",
          "url": "https://www.mozilla.org/en-US/security/advisories/mfsa2021-51/"
        }
      ],
      "release_date": "2021-12-01T16:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2021-12-06T08:55:59+00:00",
          "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\nAfter installing this update, applications using NSS (for example, Firefox) must be restarted for this update to take effect.",
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            "7Server-optional-7.4.AUS:nss-0:3.28.4-18.el7_4.src",
            "7Server-optional-7.4.AUS:nss-0:3.28.4-18.el7_4.x86_64",
            "7Server-optional-7.4.AUS:nss-debuginfo-0:3.28.4-18.el7_4.i686",
            "7Server-optional-7.4.AUS:nss-debuginfo-0:3.28.4-18.el7_4.x86_64",
            "7Server-optional-7.4.AUS:nss-devel-0:3.28.4-18.el7_4.i686",
            "7Server-optional-7.4.AUS:nss-devel-0:3.28.4-18.el7_4.x86_64",
            "7Server-optional-7.4.AUS:nss-pkcs11-devel-0:3.28.4-18.el7_4.i686",
            "7Server-optional-7.4.AUS:nss-pkcs11-devel-0:3.28.4-18.el7_4.x86_64",
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            "7Server-optional-7.4.AUS:nss-tools-0:3.28.4-18.el7_4.x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2021:4932"
        },
        {
          "category": "workaround",
          "details": "Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.",
          "product_ids": [
            "7Server-7.4.AUS:nss-0:3.28.4-18.el7_4.i686",
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      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
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          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Critical"
        }
      ],
      "title": "nss: Memory corruption in decodeECorDsaSignature with DSA signatures (and RSA-PSS)"
    }
  ]
}


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  • Confirmed: The vulnerability is confirmed from an analyst perspective.
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