rhsa-2021_2356
Vulnerability from csaf_redhat
Published
2021-06-09 09:33
Modified
2024-09-16 05:38
Summary
Red Hat Security Advisory: nettle security update

Notes

Topic
An update for nettle is now available for Red Hat Enterprise Linux 7.6 Advanced Update Support, Red Hat Enterprise Linux 7.6 Telco Extended Update Support, and Red Hat Enterprise Linux 7.6 Update Services for SAP Solutions. 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
Nettle is a cryptographic library that is designed to fit easily in almost any context: In crypto toolkits for object-oriented languages, such as C++, Python, or Pike, in applications like LSH or GNUPG, or even in kernel space. Security Fix(es): * nettle: Out of bounds memory access in signature verification (CVE-2021-20305) 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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        "relates_to_product_reference": "7Server-7.6.TUS"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "nettle-devel-0:2.7.1-9.el7_6.i686 as a component of Red Hat Enterprise Linux Server TUS (v. 7.6)",
          "product_id": "7Server-7.6.TUS:nettle-devel-0:2.7.1-9.el7_6.i686"
        },
        "product_reference": "nettle-devel-0:2.7.1-9.el7_6.i686",
        "relates_to_product_reference": "7Server-7.6.TUS"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "nettle-devel-0:2.7.1-9.el7_6.x86_64 as a component of Red Hat Enterprise Linux Server TUS (v. 7.6)",
          "product_id": "7Server-7.6.TUS:nettle-devel-0:2.7.1-9.el7_6.x86_64"
        },
        "product_reference": "nettle-devel-0:2.7.1-9.el7_6.x86_64",
        "relates_to_product_reference": "7Server-7.6.TUS"
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    ]
  },
  "vulnerabilities": [
    {
      "acknowledgments": [
        {
          "names": [
            "Niels M\u00f6ller"
          ]
        }
      ],
      "cve": "CVE-2021-20305",
      "cwe": {
        "id": "CWE-787",
        "name": "Out-of-bounds Write"
      },
      "discovery_date": "2021-03-24T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "1942533"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in Nettle, where several Nettle signature verification functions (GOST DSA, EDDSA \u0026 ECDSA) result in the Elliptic Curve Cryptography point (ECC) multiply function being called with out-of-range scalers, possibly resulting in incorrect results. This flaw allows an attacker to force an invalid signature, causing an assertion failure or possible validation. The highest threat to this vulnerability is to confidentiality, integrity, as well as system availability.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "nettle: Out of bounds memory access in signature verification",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "* Although Red Hat OpenStack\u0027s dibbler package bundles nettle, it does not include the flawed functionality and is therefore unaffected.",
          "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": {
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        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2021-20305"
        },
        {
          "category": "external",
          "summary": "RHBZ#1942533",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1942533"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2021-20305",
          "url": "https://www.cve.org/CVERecord?id=CVE-2021-20305"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2021-20305",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-20305"
        },
        {
          "category": "external",
          "summary": "https://lists.lysator.liu.se/pipermail/nettle-bugs/2021/009457.html",
          "url": "https://lists.lysator.liu.se/pipermail/nettle-bugs/2021/009457.html"
        }
      ],
      "release_date": "2021-03-16T00:00:00+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",
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          "restart_required": {
            "category": "none"
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          "url": "https://access.redhat.com/errata/RHSA-2021:2356"
        }
      ],
      "scores": [
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          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
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          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "nettle: Out of bounds memory access in signature verification"
    }
  ]
}


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