Security advisory

{
  "id": "906f875f43ea56900960d93aade03f299cf6640200ed2a782fcbb39f4ff6a20a",
  "url": "https://osv.dev/vulnerability/CVE-2019-14868",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2019-14868",
    "summary": "In ksh version 20120801, a flaw was found in the way it evaluates certain environment variables. An attacker could use this flaw to override or bypass environment restrictions to execute shell commands. Services and applications that allow remote unauthenticated attackers to provide one of those environment variables could allow them to exploit this issue remotely.",
    "evidence": "osv:CVE-2019-14868",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2019-14868",
      "aliases": [
        "CVE-2019-14868"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/att/ast",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "c7de8b641266bac7c77942239ac659edfee9ecd2"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "fixed": "c7de8b641266bac7c77942239ac659edfee9ecd2"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "2020.0.0-beta1",
            "2020.0.0-alpha1",
            "ksh93u",
            "93u",
            "2017.0.0-devel",
            "ksh93v",
            "93v"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2019-14868.json",
            "vanir_signatures": [
              {
                "id": "CVE-2019-14868-0f5281b0",
                "digest": {
                  "threshold": 0.9,
                  "line_hashes": [
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                  ]
                },
                "source": "https://github.com/att/ast/commit/c7de8b641266bac7c77942239ac659edfee9ecd2",
                "target": {
                  "file": "src/cmd/ksh93/sh/arith.c"
                },
                "deprecated": false,
                "signature_type": "Line",
                "signature_version": "v1"
              },
              {
                "id": "CVE-2019-14868-95f6fa93",
                "digest": {
                  "length": 622,
                  "function_hash": "134286879653628415161373753386099156078"
                },
                "source": "https://github.com/att/ast/commit/c7de8b641266bac7c77942239ac659edfee9ecd2",
                "target": {
                  "file": "src/cmd/ksh93/sh/arith.c",
                  "function": "sh_strnum"
                },
                "deprecated": false,
                "signature_type": "Function",
                "signature_version": "v1"
              }
            ],
            "vanir_signatures_modified": "2026-10-20T13:56:02Z"
          }
        }
      ],
      "modified": "2026-10-20T13:56:02.639176829Z",
      "provider": "osv",
      "references": [
        "https://lists.debian.org/debian-lts-announce/2020/07/msg00015.html",
        "https://support.apple.com/kb/HT211170",
        "https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-14868",
        "https://github.com/att/ast/commit/c7de8b641266bac7c77942239ac659edfee9ecd2"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:o:apple:mac_os_x:*:*:*:*:*:*:*:*"
            ],
            "vendor_product": "apple:mac_os_x",
            "extracted_events": [
              {
                "range": [
                  {
                    "fixed": "10.15.5"
                  }
                ],
                "source": "CPE_RANGE"
              }
            ]
          },
          {
            "cpes": [
              "cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*"
            ],
            "vendor_product": "debian:debian_linux",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "9.0"
                  },
                  {
                    "last_affected": "9.0"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          },
          {
            "cpes": [
              "cpe:2.3:a:ksh_project:ksh:20120801:*:*:*:*:*:*:*"
            ],
            "vendor_product": "ksh_project:ksh",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "20120801"
                  },
                  {
                    "last_affected": "20120801"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2019-14868",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 388400,
  "published_at": "2020-04-02T17:15:13.99+00:00"
}