CVE-2025-27612: Libcontainer Libcontainer Is Affected By Capabilities Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-5w4j-f78p-4wh9",
  "modified" : "2025-03-21T15:42:03Z",
  "published" : "2025-03-21T15:18:28Z",
  "aliases" : [ "CVE-2025-27612" ],
  "summary" : "Libcontainer is affected by capabilities elevation similar to GHSA-f3fp-gc8g-vw66",
  "details" : "### Impact\nIn libcontainer, while creating a tenant container, the tenant builder accepts a list of capabilities to be added in the spec of tenant container. Code can be seen [here](https://github.com/youki-dev/youki/blob/9e63fa4da1672a78ca45100f3059a732784a5174/crates/libcontainer/src/container/tenant_builder.rs#L408) . The logic here adds the given capabilities to all capabilities of main container if present in spec, otherwise simply set provided capabilities as capabilities of the tenant container.\n\nHowever, GHSA-f3fp-gc8g-vw66 was opened on runc mentioning that setting inherited caps in any case for tenant container can lead to elevation of capabilities. For this, they added a fix [here](https://github.com/opencontainers/runc/blob/986451c24e17c8d4be3c454f60b1f7be4af3e8b4/exec.go#L234-L242) where they never set new inherited caps on tenant, and set ambient caps only if original container had inherited caps.\n\nSimilarly crun never sets inherited caps as can be seen [here](https://github.com/containers/crun/blob/3ec6298abd79e144fbf3fa6db90793ff4c0516f9/src/exec.c#L319).\n\n> [!NOTE]\nThis does not affect youki binary itself, as the exec implementation is partially broken and does not pass on the user-provided caps to tenant containers, this is only applicable if you are using libcontainer directly and using the tenant builder.\n\n### Workarounds\n- Do not pass any user-provided capabilities to the tenant builder, in which case no capabilities will be set on tenant.\n- Alternatively you can verify the capabilities of original container and filter the user passed capabilities before setting them on tenant.\n\n### References\n- https://github.com/opencontainers/runc/security/advisories/GHSA-f3fp-gc8g-vw66\n- https://man7.org/linux/man-pages/man7/capabilities.7.html",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "crates.io",
      "name" : "libcontainer"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.5.3"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/opencontainers/runc/security/advisories/GHSA-f3fp-gc8g-vw66"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/youki-dev/youki/security/advisories/GHSA-5w4j-f78p-4wh9"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-27612"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/youki-dev/youki/commit/747e342d2026fbf3a395db3e2a491ebef00082f1"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/containers/crun/blob/3ec6298abd79e144fbf3fa6db90793ff4c0516f9/src/exec.c#L319"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/opencontainers/runc/blob/986451c24e17c8d4be3c454f60b1f7be4af3e8b4/exec.go#L234-L242"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/youki-dev/youki"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/youki-dev/youki/blob/9e63fa4da1672a78ca45100f3059a732784a5174/crates/libcontainer/src/container/tenant_builder.rs#L408"
  }, {
    "type" : "WEB",
    "url" : "https://man7.org/linux/man-pages/man7/capabilities.7.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-276" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2025-03-21T15:18:28Z",
    "nvd_published_at" : "2025-03-21T15:15:42Z"
  }
}