ghsa-vf95-55w6-qmrf
Vulnerability from github
Published
2025-11-05 18:45
Modified
2025-11-06 15:29
Severity ?
7.3 (High) - CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Summary
youki container escape and denial of service due to arbitrary write gadgets and procfs write redirects
Details

Impact

youki’s apparmor handling performs insufficiently strict write-target validation, which—combined with path substitution during pathname resolution—can allow writes to unintended procfs locations.

Weak write-target check youki only verifies that the destination lies somewhere under procfs. As a result, a write intended for /proc/self/attr/apparmor/exec can succeed even if the path has been redirected to /proc/sys/kernel/hostname(which is also in procfs).

Path substitution While resolving a path component-by-component, a shared-mount race can substitute intermediate components and redirect the final target.

This is a different project, but the core logic is similar to the CVE in runc. Issues were identified in runc, and verification was also conducted in youki to confirm the problems. https://github.com/opencontainers/runc/security/advisories/GHSA-cgrx-mc8f-2prm

Credits

Thanks to Li Fubang (@lifubang from acmcoder.com, CIIC) and Tõnis Tiigi (@tonistiigi from Docker) for both independently discovering runc's original vulnerability, as well as Aleksa Sarai (@cyphar from SUSE) for the original research into this class of security issues and solutions.

Show details on source website

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{
  "affected": [
    {
      "package": {
        "ecosystem": "crates.io",
        "name": "youki"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.5.7"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2025-62596"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-363",
      "CWE-61"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2025-11-05T18:45:18Z",
    "nvd_published_at": "2025-11-06T00:15:37Z",
    "severity": "HIGH"
  },
  "details": "### Impact ###\n\nyouki\u2019s apparmor handling performs insufficiently strict write-target validation, which\u2014combined with path substitution during pathname resolution\u2014can allow writes to unintended procfs locations.\n\n**Weak write-target check**\nyouki only verifies that the destination lies somewhere under procfs. As a result, a write intended for `/proc/self/attr/apparmor/exec` can succeed even if the path has been redirected to `/proc/sys/kernel/hostname`(which is also in procfs).\n\n**Path substitution**\nWhile resolving a path component-by-component, a shared-mount race can substitute intermediate components and redirect the final target.\n\nThis is a different project, but the core logic is similar to the CVE in runc. Issues were identified in runc, and verification was also conducted in youki to confirm the problems.\nhttps://github.com/opencontainers/runc/security/advisories/GHSA-cgrx-mc8f-2prm\n\n### Credits ###\n\nThanks to Li Fubang (@lifubang from acmcoder.com, CIIC) and T\u00f5nis Tiigi (@tonistiigi from Docker) for both independently discovering runc\u0027s original vulnerability, as well as Aleksa Sarai (@cyphar from SUSE) for the original research into this class of security issues and solutions.",
  "id": "GHSA-vf95-55w6-qmrf",
  "modified": "2025-11-06T15:29:58Z",
  "published": "2025-11-05T18:45:18Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/opencontainers/runc/security/advisories/GHSA-cgrx-mc8f-2prm"
    },
    {
      "type": "WEB",
      "url": "https://github.com/youki-dev/youki/security/advisories/GHSA-vf95-55w6-qmrf"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-62596"
    },
    {
      "type": "WEB",
      "url": "https://github.com/youki-dev/youki/commit/5886c91073b9be748bd8d5aed49c4a820548030a"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/youki-dev/youki"
    },
    {
      "type": "WEB",
      "url": "https://pkg.go.dev/github.com/cyphar/filepath-securejoin/pathrs-lite/procfs"
    },
    {
      "type": "WEB",
      "url": "https://youtu.be/tGseJW_uBB8"
    },
    {
      "type": "WEB",
      "url": "https://youtu.be/y1PaBzxwRWQ"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H",
      "type": "CVSS_V4"
    }
  ],
  "summary": "youki container escape and denial of service due to arbitrary write gadgets and procfs write redirects"
}


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