{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "rebber"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "5.2.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [],
  "database_specific": {
    "cwe_ids": [
      "CWE-78"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2021-09-07T14:04:47Z",
    "nvd_published_at": null,
    "severity": "CRITICAL"
  },
  "details": "### Impact\n\nA Remote Command Execution vulnerability was found in the rebber module,\nwhich allowed execution of arbitrary commands. The reported problem came\nfrom CodeBlocks, which could be escaped to insert malicious LaTeX.\n\nAnyone using `rebber` without sanitation of code content or a custom\nmacro is impacted by this vulnerability. Here is an example of a Markdown\ncontent that will exploit the vulnerability:\n\n````markdown\n```\n\\end{CodeBlock}\n\n\\immediate\\write18{COMMAND \u003e outputrce}\n\\input{outputrce}\n\n\\begin{CodeBlock}{text}\n```\n````\n\nWill insert into the generated LaTeX the result of executing\n`COMMAND` on the system.\n\n### Patches\n\nThe vulnerability has been patched in version 5.2.1.\nIf impacted, you should update to this version as soon as possible.\n\n### Workarounds\n\nIt is possible to mitigate the vulnerability without upgrading by using a\ncustom code macro. Please make sure this custom macro escapes your\nclosing LaTeX sequence. For the example above, use:\n\n```javascript\nconst escaped = content.replace(new RegExp(\u0027\\\\\\\\end\\\\s*{CodeBlock}\u0027, \u0027g\u0027), \u0027\u0027)\n```\n\n### For more information\n\nIf you have any questions or comments about this advisory, open an issue in [ZMarkdown](https://github.com/zestedesavoir/zmarkdown/issues).",
  "id": "GHSA-2c83-wfv3-q25f",
  "modified": "2021-09-07T14:04:47Z",
  "published": "2021-09-07T23:07:56Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/zestedesavoir/zmarkdown/security/advisories/GHSA-2c83-wfv3-q25f"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/zestedesavoir/zmarkdown"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [],
  "summary": "Improper Neutralization of Special Elements used in an OS Command (\u0027OS Command Injection\u0027) in ZMarkdown"
}