ghsa-9682-f2fr-3h46
Vulnerability from github
Published
2022-08-27 00:00
Modified
2022-09-02 00:01
Severity ?
7.0 (High) - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Details

A flaw was found in the way the dumpable flag setting was handled when certain SUID binaries executed its descendants. The prerequisite is a SUID binary that sets real UID equal to effective UID, and real GID equal to effective GID. The descendant will then have a dumpable value set to 1. As a result, if the descendant process crashes and core_pattern is set to a relative value, its core dump is stored in the current directory with uid:gid permissions. An unprivileged local user with eligible root SUID binary could use this flaw to place core dumps into root-owned directories, potentially resulting in escalation of privileges.

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{
  "affected": [],
  "aliases": [
    "CVE-2021-3864"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-284"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2022-08-26T16:15:00Z",
    "severity": "HIGH"
  },
  "details": "A flaw was found in the way the dumpable flag setting was handled when certain SUID binaries executed its descendants. The prerequisite is a SUID binary that sets real UID equal to effective UID, and real GID equal to effective GID. The descendant will then have a dumpable value set to 1. As a result, if the descendant process crashes and core_pattern is set to a relative value, its core dump is stored in the current directory with uid:gid permissions. An unprivileged local user with eligible root SUID binary could use this flaw to place core dumps into root-owned directories, potentially resulting in escalation of privileges.",
  "id": "GHSA-9682-f2fr-3h46",
  "modified": "2022-09-02T00:01:10Z",
  "published": "2022-08-27T00:00:45Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-3864"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/security/cve/CVE-2021-3864"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2015046"
    },
    {
      "type": "WEB",
      "url": "https://lore.kernel.org/all/20211221021744.864115-1-longman%40redhat.com"
    },
    {
      "type": "WEB",
      "url": "https://lore.kernel.org/all/20211221021744.864115-1-longman@redhat.com"
    },
    {
      "type": "WEB",
      "url": "https://lore.kernel.org/all/20211226150310.GA992%401wt.eu"
    },
    {
      "type": "WEB",
      "url": "https://lore.kernel.org/all/20211226150310.GA992@1wt.eu"
    },
    {
      "type": "WEB",
      "url": "https://lore.kernel.org/lkml/20211228170910.623156-1-wander%40redhat.com"
    },
    {
      "type": "WEB",
      "url": "https://lore.kernel.org/lkml/20211228170910.623156-1-wander@redhat.com"
    },
    {
      "type": "WEB",
      "url": "https://security-tracker.debian.org/tracker/CVE-2021-3864"
    },
    {
      "type": "WEB",
      "url": "https://www.openwall.com/lists/oss-security/2021/10/20/2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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