{
  "document": {
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      "text": "Moderate"
    },
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Copyright \u00a9 Red Hat, Inc. All rights reserved.",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en",
    "notes": [
      {
        "category": "summary",
        "text": "An update for perl-CPAN is now available for Red Hat Enterprise Linux 8.\n\nRed Hat Product Security has rated this update as having a security impact of Moderate. 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.",
        "title": "Topic"
      },
      {
        "category": "general",
        "text": "The CPAN module is a tool to query, download and build perl modules from CPAN sites.\n\nSecurity Fix(es):\n\n* perl-CPAN: Bypass of verification of signatures in CHECKSUMS files (CVE-2020-16156)\n\nFor 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.",
        "title": "Details"
      },
      {
        "category": "legal_disclaimer",
        "text": "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.",
        "title": "Terms of Use"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "https://access.redhat.com/security/team/contact/",
      "issuing_authority": "Red Hat Product Security is responsible for vulnerability handling across all Red Hat products and services.",
      "name": "Red Hat Product Security",
      "namespace": "https://www.redhat.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "https://access.redhat.com/errata/RHSA-2025:8432",
        "url": "https://access.redhat.com/errata/RHSA-2025:8432"
      },
      {
        "category": "external",
        "summary": "https://access.redhat.com/security/updates/classification/#moderate",
        "url": "https://access.redhat.com/security/updates/classification/#moderate"
      },
      {
        "category": "external",
        "summary": "2035273",
        "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2035273"
      },
      {
        "category": "self",
        "summary": "Canonical URL",
        "url": "https://security.access.redhat.com/data/csaf/v2/advisories/2025/rhsa-2025_8432.json"
      }
    ],
    "title": "Red Hat Security Advisory: perl-CPAN security update",
    "tracking": {
      "current_release_date": "2025-08-03T00:16:09+00:00",
      "generator": {
        "date": "2025-08-03T00:16:09+00:00",
        "engine": {
          "name": "Red Hat SDEngine",
          "version": "4.6.6"
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      },
      "id": "RHSA-2025:8432",
      "initial_release_date": "2025-06-03T07:45:18+00:00",
      "revision_history": [
        {
          "date": "2025-06-03T07:45:18+00:00",
          "number": "1",
          "summary": "Initial version"
        },
        {
          "date": "2025-06-03T07:45:18+00:00",
          "number": "2",
          "summary": "Last updated version"
        },
        {
          "date": "2025-08-03T00:16:09+00:00",
          "number": "3",
          "summary": "Last generated version"
        }
      ],
      "status": "final",
      "version": "3"
    }
  },
  "product_tree": {
    "branches": [
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        "branches": [
          {
            "branches": [
              {
                "category": "product_name",
                "name": "Red Hat Enterprise Linux AppStream (v. 8)",
                "product": {
                  "name": "Red Hat Enterprise Linux AppStream (v. 8)",
                  "product_id": "AppStream-8.10.0.Z.MAIN.EUS",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:redhat:enterprise_linux:8::appstream"
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                "name": "perl-CPAN-0:2.18-402.el8_10.src",
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                  "product_id": "perl-CPAN-0:2.18-402.el8_10.src",
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                    "purl": "pkg:rpm/redhat/perl-CPAN@2.18-402.el8_10?arch=src"
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            "name": "src"
          },
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                "name": "perl-CPAN-0:2.18-402.el8_10.noarch",
                "product": {
                  "name": "perl-CPAN-0:2.18-402.el8_10.noarch",
                  "product_id": "perl-CPAN-0:2.18-402.el8_10.noarch",
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        "name": "Red Hat"
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    "relationships": [
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        "full_product_name": {
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          "product_id": "AppStream-8.10.0.Z.MAIN.EUS:perl-CPAN-0:2.18-402.el8_10.noarch"
        },
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        "relates_to_product_reference": "AppStream-8.10.0.Z.MAIN.EUS"
      },
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        },
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        "relates_to_product_reference": "AppStream-8.10.0.Z.MAIN.EUS"
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  "vulnerabilities": [
    {
      "cve": "CVE-2020-16156",
      "cwe": {
        "id": "CWE-347",
        "name": "Improper Verification of Cryptographic Signature"
      },
      "discovery_date": "2021-12-13T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2035273"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in the way the perl-CPAN performed verification of package signatures stored in CHECKSUMS files. A malicious or compromised CPAN server used by a user, or a man-in-the-middle attacker, could use this flaw to bypass signature verification.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "perl-CPAN: Bypass of verification of signatures in CHECKSUMS files",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This vulnerability was rated as MODERATE severity because it allows an attacker to inject malicious packages into the CPAN system by bypassing signature verification, it requires the attacker to control a CPAN mirror and deceive the victim into using it, it poses a risk of installing compromised software.\n\nWithin regulated environments, a combination of the following controls acts as a significant barrier to successfully exploiting a CWE-347: Improper Verification of Cryptographic Signature vulnerability and therefore downgrades the severity of this particular CVE from Moderate to Low.\n\nThe platform uses secure, encrypted HTTPS connections over TLS 1.2, and access to all platform resources is restricted by default. Red Hat enforces strong authentication through hard token-based multi-factor authentication (MFA), combined with least privilege principles to ensure that only authorized users and roles can execute or modify code. Internal and external certificates are established and maintained within a secure environment, and the platform enforces the use of FIPS-validated cryptographic modules across all compute resources. This reduces the risk of improper cryptographic signatures by ensuring that keys used for signature generation and verification are created with approved algorithms, securely managed, and protected against unauthorized access. Additionally, static code analysis and peer code reviews support robust input validation and error handling, reducing the likelihood of missing or improperly implemented signature validation mechanisms.",
          "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": [
          "AppStream-8.10.0.Z.MAIN.EUS:perl-CPAN-0:2.18-402.el8_10.noarch",
          "AppStream-8.10.0.Z.MAIN.EUS:perl-CPAN-0:2.18-402.el8_10.src"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2020-16156"
        },
        {
          "category": "external",
          "summary": "RHBZ#2035273",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2035273"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2020-16156",
          "url": "https://www.cve.org/CVERecord?id=CVE-2020-16156"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2020-16156",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-16156"
        },
        {
          "category": "external",
          "summary": "http://blogs.perl.org/users/neilb/2021/11/addressing-cpan-vulnerabilities-related-to-checksums.html",
          "url": "http://blogs.perl.org/users/neilb/2021/11/addressing-cpan-vulnerabilities-related-to-checksums.html"
        },
        {
          "category": "external",
          "summary": "https://blog.hackeriet.no/cpan-signature-verification-vulnerabilities/",
          "url": "https://blog.hackeriet.no/cpan-signature-verification-vulnerabilities/"
        }
      ],
      "release_date": "2021-11-23T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2025-06-03T07:45:18+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",
          "product_ids": [
            "AppStream-8.10.0.Z.MAIN.EUS:perl-CPAN-0:2.18-402.el8_10.noarch",
            "AppStream-8.10.0.Z.MAIN.EUS:perl-CPAN-0:2.18-402.el8_10.src"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2025:8432"
        },
        {
          "category": "workaround",
          "details": "This issue can be mitigated by configuring perl-CPAN to only use trusted CPAN mirrors (www.cpan.org or cpan.metacpan.org) and use HTTPS for communication with CPAN servers.  If you already have a cpan configured, the list of configured mirrors can be viewed by running the `cpan` command without any argument and entering the following command on the cpan command\u0027s prompt:\n\n```\n  o conf urllist\n```\n\nEnsure that the URL list only includes trusted mirrors and that https:// scheme is used for all URLs.  A different set of mirrors can be configured using the following commands (these examples show how to configure one or more mirrors, only one of the commands should be used):\n\n```\n  o conf urllist https://www.cpan.org\n  o conf urllist https://www.cpan.org https://cpan.metacpan.org\n```\n\nAfter changing configuration, the following command must be used to save the configuration:\n\n```\n  o conf commit\n```",
          "product_ids": [
            "AppStream-8.10.0.Z.MAIN.EUS:perl-CPAN-0:2.18-402.el8_10.noarch",
            "AppStream-8.10.0.Z.MAIN.EUS:perl-CPAN-0:2.18-402.el8_10.src"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "AppStream-8.10.0.Z.MAIN.EUS:perl-CPAN-0:2.18-402.el8_10.noarch",
            "AppStream-8.10.0.Z.MAIN.EUS:perl-CPAN-0:2.18-402.el8_10.src"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "perl-CPAN: Bypass of verification of signatures in CHECKSUMS files"
    }
  ]
}