{
  "document": {
    "aggregate_severity": {
      "text": "Important"
    },
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "text": "TuxCare License Agreement",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en",
    "notes": [
      {
        "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 Cloud Linux Inc. and provide a link to the original.",
        "title": "Terms of Use"
      },
      {
        "category": "details",
        "text": "* SECURITY UPDATE: directory traversal in cpio extraction\n     - debian/patches/CVE-2023-39810.patch: add FEATURE_PATH_TRAVERSAL_PROTECTION\n       config option, call strip_unsafe_prefix() in data_extract_all.c to prevent\n       path traversal via ../ in archive filenames. Covers cpio, ar, rpm.\n     - Enable CONFIG_FEATURE_PATH_TRAVERSAL_PROTECTION=y in all build configs.\n     - debian/patches/CVE-2023-39810.patch: replace `echo -e` with `printf` in\n       the new cpio path-traversal testcase so it is portable to dash (the\n       Ubuntu /bin/sh).\n     - debian/testsuite-linux.diff: skip the pre-existing\n       \"cpio uses by default uid/gid\" test, which is fragile in the pbuilder\n       chroot (id -u returns 0 but source files retain uid=1000 from the\n       build worker, causing a spurious mismatch).\n     - debian/patches/CVE-2023-39810.patch: include the \"1 blocks\" summary\n       line that busybox cpio -vi emits (to stderr, merged via 2>&1) at\n       end-of-archive in the expected output of the new path-traversal\n       testcase; the functional check (file not written, exit 0) already\n       passed but the string-match failed because 1.30.1 always prints\n       \"N blocks\", matching the pattern used by other cpio tests in\n       testsuite/cpio.tests.\n     - debian/testsuite-linux.diff: skip the pre-existing hostname-d-works\n       test when the pbuilder chroot cannot resolve its own hostname via DNS\n       (no /etc/hosts entry for the build host).\n     - CVE-2023-39810",
        "title": "Details"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "https://tuxcare.com/contact/",
      "name": "TuxCare",
      "namespace": "https://tuxcare.com/"
    },
    "references": [
      {
        "category": "self",
        "summary": "https://cve.tuxcare.com/els/releases/CLSA-2026:1777368104",
        "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1777368104"
      },
      {
        "category": "self",
        "summary": "Canonical URL",
        "url": "https://security.tuxcare.com/csaf/v2/els_os/ubuntu20.04els/advisories/2026/clsa-2026_1777368104.json"
      }
    ],
    "tracking": {
      "current_release_date": "2026-04-28T09:22:24Z",
      "generator": {
        "date": "2026-04-28T09:22:24Z",
        "engine": {
          "name": "pyCSAF"
        }
      },
      "id": "CLSA-2026:1777368104",
      "initial_release_date": "2026-04-28T09:22:24Z",
      "revision_history": [
        {
          "date": "2026-04-28T09:22:24Z",
          "number": "1",
          "summary": "Initial version"
        }
      ],
      "status": "final",
      "version": "1"
    },
    "title": "Fix CVE(s): CVE-2023-39810"
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_name",
                "name": "Ubuntu 20.04",
                "product": {
                  "name": "Ubuntu 20.04",
                  "product_id": "Ubuntu-20",
                  "product_identification_helper": {
                    "cpe": "cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*"
                  }
                }
              }
            ],
            "category": "product_family",
            "name": "Ubuntu"
          }
        ],
        "category": "vendor",
        "name": "Canonical Ltd."
      },
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version",
                "name": "busybox-1:1.30.1-4ubuntu6.5+tuxcare.els1.amd64",
                "product": {
                  "name": "busybox-1:1.30.1-4ubuntu6.5+tuxcare.els1.amd64",
                  "product_id": "busybox-1:1.30.1-4ubuntu6.5+tuxcare.els1.amd64",
                  "product_identification_helper": {
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                  }
                }
              },
              {
                "category": "product_version",
                "name": "busybox-static-1:1.30.1-4ubuntu6.5+tuxcare.els1.amd64",
                "product": {
                  "name": "busybox-static-1:1.30.1-4ubuntu6.5+tuxcare.els1.amd64",
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                  }
                }
              },
              {
                "category": "product_version",
                "name": "udhcpc-1:1.30.1-4ubuntu6.5+tuxcare.els1.amd64",
                "product": {
                  "name": "udhcpc-1:1.30.1-4ubuntu6.5+tuxcare.els1.amd64",
                  "product_id": "udhcpc-1:1.30.1-4ubuntu6.5+tuxcare.els1.amd64",
                  "product_identification_helper": {
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                  }
                }
              },
              {
                "category": "product_version",
                "name": "udhcpd-1:1.30.1-4ubuntu6.5+tuxcare.els1.amd64",
                "product": {
                  "name": "udhcpd-1:1.30.1-4ubuntu6.5+tuxcare.els1.amd64",
                  "product_id": "udhcpd-1:1.30.1-4ubuntu6.5+tuxcare.els1.amd64",
                  "product_identification_helper": {
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                  }
                }
              },
              {
                "category": "product_version",
                "name": "busybox-initramfs-1:1.30.1-4ubuntu6.5+tuxcare.els1.amd64",
                "product": {
                  "name": "busybox-initramfs-1:1.30.1-4ubuntu6.5+tuxcare.els1.amd64",
                  "product_id": "busybox-initramfs-1:1.30.1-4ubuntu6.5+tuxcare.els1.amd64",
                  "product_identification_helper": {
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                  }
                }
              }
            ],
            "category": "architecture",
            "name": "amd64"
          },
          {
            "branches": [
              {
                "category": "product_version",
                "name": "busybox-syslogd-1:1.30.1-4ubuntu6.5+tuxcare.els1.all",
                "product": {
                  "name": "busybox-syslogd-1:1.30.1-4ubuntu6.5+tuxcare.els1.all",
                  "product_id": "busybox-syslogd-1:1.30.1-4ubuntu6.5+tuxcare.els1.all",
                  "product_identification_helper": {
                    "purl": "pkg:deb/tuxcare/busybox-syslogd@1.30.1-4ubuntu6.5%2Btuxcare.els1?arch=all"
                  }
                }
              }
            ],
            "category": "architecture",
            "name": "all"
          }
        ],
        "category": "vendor",
        "name": "TuxCare"
      }
    ],
    "relationships": [
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "busybox-1:1.30.1-4ubuntu6.5+tuxcare.els1.amd64 as a component of Ubuntu 20.04",
          "product_id": "Ubuntu-20:busybox-1:1.30.1-4ubuntu6.5+tuxcare.els1.amd64"
        },
        "product_reference": "busybox-1:1.30.1-4ubuntu6.5+tuxcare.els1.amd64",
        "relates_to_product_reference": "Ubuntu-20"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "busybox-syslogd-1:1.30.1-4ubuntu6.5+tuxcare.els1.all as a component of Ubuntu 20.04",
          "product_id": "Ubuntu-20:busybox-syslogd-1:1.30.1-4ubuntu6.5+tuxcare.els1.all"
        },
        "product_reference": "busybox-syslogd-1:1.30.1-4ubuntu6.5+tuxcare.els1.all",
        "relates_to_product_reference": "Ubuntu-20"
      },
      {
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        "full_product_name": {
          "name": "busybox-static-1:1.30.1-4ubuntu6.5+tuxcare.els1.amd64 as a component of Ubuntu 20.04",
          "product_id": "Ubuntu-20:busybox-static-1:1.30.1-4ubuntu6.5+tuxcare.els1.amd64"
        },
        "product_reference": "busybox-static-1:1.30.1-4ubuntu6.5+tuxcare.els1.amd64",
        "relates_to_product_reference": "Ubuntu-20"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "udhcpc-1:1.30.1-4ubuntu6.5+tuxcare.els1.amd64 as a component of Ubuntu 20.04",
          "product_id": "Ubuntu-20:udhcpc-1:1.30.1-4ubuntu6.5+tuxcare.els1.amd64"
        },
        "product_reference": "udhcpc-1:1.30.1-4ubuntu6.5+tuxcare.els1.amd64",
        "relates_to_product_reference": "Ubuntu-20"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "udhcpd-1:1.30.1-4ubuntu6.5+tuxcare.els1.amd64 as a component of Ubuntu 20.04",
          "product_id": "Ubuntu-20:udhcpd-1:1.30.1-4ubuntu6.5+tuxcare.els1.amd64"
        },
        "product_reference": "udhcpd-1:1.30.1-4ubuntu6.5+tuxcare.els1.amd64",
        "relates_to_product_reference": "Ubuntu-20"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "busybox-initramfs-1:1.30.1-4ubuntu6.5+tuxcare.els1.amd64 as a component of Ubuntu 20.04",
          "product_id": "Ubuntu-20:busybox-initramfs-1:1.30.1-4ubuntu6.5+tuxcare.els1.amd64"
        },
        "product_reference": "busybox-initramfs-1:1.30.1-4ubuntu6.5+tuxcare.els1.amd64",
        "relates_to_product_reference": "Ubuntu-20"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2023-39810",
      "cwe": {
        "id": "CWE-22",
        "name": "Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')"
      },
      "notes": [
        {
          "category": "description",
          "text": "An issue in the CPIO command of Busybox v1.33.2 allows attackers to execute a directory traversal.",
          "title": "Vulnerability description"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
        "fixed": [
          "Ubuntu-20:busybox-1:1.30.1-4ubuntu6.5+tuxcare.els1.amd64",
          "Ubuntu-20:busybox-initramfs-1:1.30.1-4ubuntu6.5+tuxcare.els1.amd64",
          "Ubuntu-20:busybox-static-1:1.30.1-4ubuntu6.5+tuxcare.els1.amd64",
          "Ubuntu-20:busybox-syslogd-1:1.30.1-4ubuntu6.5+tuxcare.els1.all",
          "Ubuntu-20:udhcpc-1:1.30.1-4ubuntu6.5+tuxcare.els1.amd64",
          "Ubuntu-20:udhcpd-1:1.30.1-4ubuntu6.5+tuxcare.els1.amd64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2023-39810"
        },
        {
          "category": "external",
          "summary": "http://busybox.com",
          "url": "http://busybox.com/"
        },
        {
          "category": "external",
          "summary": "https://www.pentagrid.ch/en/blog/busybox-cpio-directory-traversal-vulnerability/",
          "url": "https://www.pentagrid.ch/en/blog/busybox-cpio-directory-traversal-vulnerability/"
        },
        {
          "category": "external",
          "summary": "http://www.openwall.com/lists/oss-security/2025/04/23/1",
          "url": "http://www.openwall.com/lists/oss-security/2025/04/23/1"
        },
        {
          "category": "external",
          "summary": "http://www.openwall.com/lists/oss-security/2025/04/23/2",
          "url": "http://www.openwall.com/lists/oss-security/2025/04/23/2"
        },
        {
          "category": "external",
          "summary": "http://www.openwall.com/lists/oss-security/2025/04/23/3",
          "url": "http://www.openwall.com/lists/oss-security/2025/04/23/3"
        },
        {
          "category": "external",
          "summary": "http://www.openwall.com/lists/oss-security/2025/04/24/2",
          "url": "http://www.openwall.com/lists/oss-security/2025/04/24/2"
        }
      ],
      "release_date": "2023-08-28T19:15:00Z",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-04-28T09:21:47.325260Z",
          "details": "Details on how to apply the fix are available at: https://cve.tuxcare.com/els/releases/CLSA-2026:1777368104",
          "product_ids": [
            "Ubuntu-20:busybox-1:1.30.1-4ubuntu6.5+tuxcare.els1.amd64",
            "Ubuntu-20:busybox-initramfs-1:1.30.1-4ubuntu6.5+tuxcare.els1.amd64",
            "Ubuntu-20:busybox-static-1:1.30.1-4ubuntu6.5+tuxcare.els1.amd64",
            "Ubuntu-20:busybox-syslogd-1:1.30.1-4ubuntu6.5+tuxcare.els1.all",
            "Ubuntu-20:udhcpc-1:1.30.1-4ubuntu6.5+tuxcare.els1.amd64",
            "Ubuntu-20:udhcpd-1:1.30.1-4ubuntu6.5+tuxcare.els1.amd64"
          ],
          "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1777368104"
        }
      ],
      "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": [
            "Ubuntu-20:busybox-1:1.30.1-4ubuntu6.5+tuxcare.els1.amd64",
            "Ubuntu-20:busybox-initramfs-1:1.30.1-4ubuntu6.5+tuxcare.els1.amd64",
            "Ubuntu-20:busybox-static-1:1.30.1-4ubuntu6.5+tuxcare.els1.amd64",
            "Ubuntu-20:busybox-syslogd-1:1.30.1-4ubuntu6.5+tuxcare.els1.all",
            "Ubuntu-20:udhcpc-1:1.30.1-4ubuntu6.5+tuxcare.els1.amd64",
            "Ubuntu-20:udhcpd-1:1.30.1-4ubuntu6.5+tuxcare.els1.amd64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ]
    }
  ]
}