Vulnerability-Lookup

GHSA-C5FP-QRW2-8X2W

Vulnerability from github – Published: 2022-05-24 22:28 – Updated: 2022-07-30 00:00

Details

A security vulnerability that can lead to local privilege escalation has been found in ’guix-daemon’. It affects multi-user setups in which ’guix-daemon’ runs locally. The attack consists in having an unprivileged user spawn a build process, for instance with guix build, that makes its build directory world-writable. The user then creates a hardlink to a root-owned file such as /etc/shadow in that build directory. If the user passed the --keep-failed option and the build eventually fails, the daemon changes ownership of the whole build tree, including the hardlink, to the user. At that point, the user has write access to the target file. Versions after and including v0.11.0-3298-g2608e40988, and versions prior to v1.2.0-75109-g94f0312546 are vulnerable.

Severity ?

5.5 (Medium)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Show details on source website

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{
  "affected": [],
  "aliases": [
    "CVE-2021-27851"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-269",
      "CWE-59"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2021-04-26T16:15:00Z",
    "severity": "MODERATE"
  },
  "details": "A security vulnerability that can lead to local privilege escalation has been found in \u2019guix-daemon\u2019. It affects multi-user setups in which \u2019guix-daemon\u2019 runs locally. The attack consists in having an unprivileged user spawn a build process, for instance with `guix build`, that makes its build directory world-writable. The user then creates a hardlink to a root-owned file such as /etc/shadow in that build directory. If the user passed the --keep-failed option and the build eventually fails, the daemon changes ownership of the whole build tree, including the hardlink, to the user. At that point, the user has write access to the target file. Versions after and including v0.11.0-3298-g2608e40988, and versions prior to v1.2.0-75109-g94f0312546 are vulnerable.",
  "id": "GHSA-c5fp-qrw2-8x2w",
  "modified": "2022-07-30T00:00:35Z",
  "published": "2022-05-24T22:28:31Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-27851"
    },
    {
      "type": "WEB",
      "url": "https://bugs.gnu.org/47229"
    },
    {
      "type": "WEB",
      "url": "https://guix.gnu.org/en/blog/2021/risk-of-local-privilege-escalation-via-guix-daemon"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2021-27851 (GCVE-0-2021-27851)

Vulnerability from cvelistv5 – Published: 2021-04-26 15:35 – Updated: 2024-09-17 02:11

Title

Local privilege escalation in GNU Guix via guix-daemon and '--keep-failed'

Summary

A security vulnerability that can lead to local privilege escalation has been found in ’guix-daemon’. It affects multi-user setups in which ’guix-daemon’ runs locally. The attack consists in having an unprivileged user spawn a build process, for instance with `guix build`, that makes its build directory world-writable. The user then creates a hardlink to a root-owned file such as /etc/shadow in that build directory. If the user passed the --keep-failed option and the build eventually fails, the daemon changes ownership of the whole build tree, including the hardlink, to the user. At that point, the user has write access to the target file. Versions after and including v0.11.0-3298-g2608e40988, and versions prior to v1.2.0-75109-g94f0312546 are vulnerable.

Severity ?

No CVSS data available.

CWE

CWE-264 - Permissions, Privileges, and Access Controls

Assigner

certcc

References

URL

Tags

	https://guix.gnu.org/en/blog/2021/risk-of-local-p…	x_refsource_MISC
	https://bugs.gnu.org/47229	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	GNU Guix	guix-daemon	Affected: v0.11.0-3298-g2608e40988 , < unspecified (custom) Affected: unspecified , < v1.2.0-75109-g94f0312546 (custom)

Credits

Nathan Nye of WhiteBeam Security

Show details on NVD website

JSON

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Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-C5FP-QRW2-8X2W

CVE-2021-27851 (GCVE-0-2021-27851)

Tags

Sightings

Nomenclature