GHSA-6HJR-V6G4-3FM8

Vulnerability from github – Published: 2025-12-10 15:47 – Updated: 2025-12-10 15:47
VLAI
Summary
ImageMagick is vulnerable to an integer Overflow in TIM decoder leading to out of bounds read (32-bit only)
Details

Summary

The TIM (PSX TIM) image parser in ImageMagick contains a critical integer overflow vulnerability in the ReadTIMImage function (coders/tim.c). The code reads width and height (16-bit values) from the file header and calculates image_size = 2 * width * height without checking for overflow. On 32-bit systems (or where size_t is 32-bit), this calculation can overflow if width and height are large (e.g., 65535), wrapping around to a small value. This results in a small heap allocation via AcquireQuantumMemory and later operations relying on the dimensions can trigger an out of bounds read.

Vulnerable Code

File: coders/tim.c

width=ReadBlobLSBShort(image);
height=ReadBlobLSBShort(image);
image_size=2*width*height;       // Line 234 - NO OVERFLOW CHECK!

Impact

This vulnerability can lead to Arbitrary Memory Disclosure due to an out of bounds read on 32-bit systems.

Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Show details on source website
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{
  "affected": [
    {
      "package": {
        "ecosystem": "NuGet",
        "name": "Magick.NET-Q16-AnyCPU"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "14.10.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "NuGet",
        "name": "Magick.NET-Q16-HDRI-AnyCPU"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "14.10.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "NuGet",
        "name": "Magick.NET-Q16-HDRI-x86"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "14.10.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "NuGet",
        "name": "Magick.NET-Q16-x86"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "14.10.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "NuGet",
        "name": "Magick.NET-Q8-AnyCPU"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "14.10.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "NuGet",
        "name": "Magick.NET-Q8-x86"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "14.10.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2025-66628"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-125"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2025-12-10T15:47:42Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "### Summary\nThe TIM (PSX TIM) image parser in ImageMagick contains a critical integer overflow vulnerability in the `ReadTIMImage` function (`coders/tim.c`). The code reads `width` and `height` (16-bit values) from the file header and calculates `image_size = 2 * width * height` without checking for overflow.\nOn 32-bit systems (or where `size_t` is 32-bit), this calculation can overflow if `width` and `height` are large (e.g., 65535), wrapping around to a small value. This results in a small heap allocation via `AcquireQuantumMemory` and later operations relying on the dimensions can trigger an out of bounds read.\n### Vulnerable Code\nFile: `coders/tim.c`\n```c\nwidth=ReadBlobLSBShort(image);\nheight=ReadBlobLSBShort(image);\nimage_size=2*width*height;       // Line 234 - NO OVERFLOW CHECK!\n```\n\n### Impact\nThis vulnerability can lead to Arbitrary Memory Disclosure due to an out of bounds read on 32-bit systems.",
  "id": "GHSA-6hjr-v6g4-3fm8",
  "modified": "2025-12-10T15:47:42Z",
  "published": "2025-12-10T15:47:42Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/ImageMagick/ImageMagick/security/advisories/GHSA-6hjr-v6g4-3fm8"
    },
    {
      "type": "WEB",
      "url": "https://github.com/dlemstra/Magick.NET/commit/2dfa08e15cfd11016a79615994787b14f9048b1c"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/ImageMagick/ImageMagick"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "ImageMagick is vulnerable to an integer Overflow in TIM decoder leading to out of bounds read (32-bit only)"
}



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