ubuntu-cve-2020-36773
Vulnerability from osv_ubuntu
Published
2024-02-04 18:16
Modified
2025-07-16 04:56
Summary
Details

Artifex Ghostscript before 9.53.0 has an out-of-bounds write and use-after-free in devices/vector/gdevtxtw.c (for txtwrite) because a single character code in a PDF document can map to more than one Unicode code point (e.g., for a ligature).

Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "ghostscript",
            "binary_version": "9.50~dfsg-5ubuntu4.11"
          },
          {
            "binary_name": "ghostscript-dbg",
            "binary_version": "9.50~dfsg-5ubuntu4.11"
          },
          {
            "binary_name": "ghostscript-doc",
            "binary_version": "9.50~dfsg-5ubuntu4.11"
          },
          {
            "binary_name": "ghostscript-x",
            "binary_version": "9.50~dfsg-5ubuntu4.11"
          },
          {
            "binary_name": "libgs-dev",
            "binary_version": "9.50~dfsg-5ubuntu4.11"
          },
          {
            "binary_name": "libgs9",
            "binary_version": "9.50~dfsg-5ubuntu4.11"
          },
          {
            "binary_name": "libgs9-common",
            "binary_version": "9.50~dfsg-5ubuntu4.11"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "ghostscript",
        "purl": "pkg:deb/ubuntu/ghostscript@9.50~dfsg-5ubuntu4.11?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "9.50~dfsg-5ubuntu4.11"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "9.27~dfsg+0-0ubuntu3",
        "9.27~dfsg+0-0ubuntu4",
        "9.50~dfsg-5ubuntu1",
        "9.50~dfsg-5ubuntu2",
        "9.50~dfsg-5ubuntu3",
        "9.50~dfsg-5ubuntu4",
        "9.50~dfsg-5ubuntu4.1",
        "9.50~dfsg-5ubuntu4.2",
        "9.50~dfsg-5ubuntu4.3",
        "9.50~dfsg-5ubuntu4.4",
        "9.50~dfsg-5ubuntu4.5",
        "9.50~dfsg-5ubuntu4.6",
        "9.50~dfsg-5ubuntu4.7",
        "9.50~dfsg-5ubuntu4.8",
        "9.50~dfsg-5ubuntu4.9",
        "9.50~dfsg-5ubuntu4.10"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "ghostscript",
            "binary_version": "9.55.0~dfsg1-0ubuntu5.5"
          },
          {
            "binary_name": "ghostscript-dbgsym",
            "binary_version": "9.55.0~dfsg1-0ubuntu5.5"
          },
          {
            "binary_name": "ghostscript-doc",
            "binary_version": "9.55.0~dfsg1-0ubuntu5.5"
          },
          {
            "binary_name": "ghostscript-x",
            "binary_version": "9.55.0~dfsg1-0ubuntu5.5"
          },
          {
            "binary_name": "ghostscript-x-dbgsym",
            "binary_version": "9.55.0~dfsg1-0ubuntu5.5"
          },
          {
            "binary_name": "libgs-dev",
            "binary_version": "9.55.0~dfsg1-0ubuntu5.5"
          },
          {
            "binary_name": "libgs9",
            "binary_version": "9.55.0~dfsg1-0ubuntu5.5"
          },
          {
            "binary_name": "libgs9-common",
            "binary_version": "9.55.0~dfsg1-0ubuntu5.5"
          },
          {
            "binary_name": "libgs9-dbgsym",
            "binary_version": "9.55.0~dfsg1-0ubuntu5.5"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "ghostscript",
        "purl": "pkg:deb/ubuntu/ghostscript@9.55.0~dfsg1-0ubuntu5.5?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "9.55.0~dfsg1-0ubuntu5.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "9.54.0~dfsg1-0ubuntu2",
        "9.55.0~dfsg1-0ubuntu4",
        "9.55.0~dfsg1-0ubuntu5",
        "9.55.0~dfsg1-0ubuntu5.1",
        "9.55.0~dfsg1-0ubuntu5.2",
        "9.55.0~dfsg1-0ubuntu5.3",
        "9.55.0~dfsg1-0ubuntu5.4"
      ]
    }
  ],
  "aliases": [],
  "details": "Artifex Ghostscript before 9.53.0 has an out-of-bounds write and use-after-free in devices/vector/gdevtxtw.c (for txtwrite) because a single character code in a PDF document can map to more than one Unicode code point (e.g., for a ligature).",
  "id": "UBUNTU-CVE-2020-36773",
  "modified": "2025-07-16T04:56:27Z",
  "published": "2024-02-04T18:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2020-36773"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/ArtifexSoftware/ghostpdl-downloads/releases/tag/gs9530"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2020-36773"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2020-36773"
  ],
  "withdrawn": "2025-07-18T16:46:18Z"
}



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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.