GHSA-5X32-C9MF-49CC

Vulnerability from github – Published: 2019-06-20 16:06 – Updated: 2023-08-28 13:16
VLAI?
Summary
RubyGems Delete directory using symlink when decompressing tar
Details

A Directory Traversal issue was discovered in RubyGems 2.7.6 and later through 3.0.2. Before making new directories or touching files (which now include path-checking code for symlinks), it would delete the target destination. If that destination was hidden behind a symlink, a malicious gem could delete arbitrary files on the user's machine, presuming the attacker could guess at paths. Given how frequently gem is run as sudo, and how predictable paths are on modern systems (/tmp, /usr, etc.), this could likely lead to data loss or an unusable system.

Severity ?
7.4 (High)
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H
Show details on source website
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{
  "affected": [
    {
      "package": {
        "ecosystem": "RubyGems",
        "name": "rubygems-update"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.7.6"
            },
            {
              "fixed": "2.7.9"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "RubyGems",
        "name": "rubygems-update"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.0.0"
            },
            {
              "fixed": "3.0.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2019-8320"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-22"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2019-06-20T16:02:48Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "A Directory Traversal issue was discovered in RubyGems 2.7.6 and later through 3.0.2. Before making new directories or touching files (which now include path-checking code for symlinks), it would delete the target destination. If that destination was hidden behind a symlink, a malicious gem could delete arbitrary files on the user\u0027s machine, presuming the attacker could guess at paths. Given how frequently gem is run as sudo, and how predictable paths are on modern systems (/tmp, /usr, etc.), this could likely lead to data loss or an unusable system.",
  "id": "GHSA-5x32-c9mf-49cc",
  "modified": "2023-08-28T13:16:23Z",
  "published": "2019-06-20T16:06:15Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2019-8320"
    },
    {
      "type": "WEB",
      "url": "https://hackerone.com/reports/317321"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2019:1429"
    },
    {
      "type": "WEB",
      "url": "https://blog.rubygems.org/2019/03/05/security-advisories-2019-03.html"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/rubygems/rubygems"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rubysec/ruby-advisory-db/blob/master/gems/rubygems-update/CVE-2019-8320.yml"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2020/08/msg00027.html"
    },
    {
      "type": "WEB",
      "url": "http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00036.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "RubyGems Delete directory using symlink when decompressing tar"
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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