github - ghsa-c5fp-qrw2-8x2w

ghsa-c5fp-qrw2-8x2w

Vulnerability from github

Published

2022-05-24 22:28

Modified

2022-07-30 00:00

Severity ?

5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

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.

Show details on source website

JSON

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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

Modified

2024-09-17 02:11

Severity ?

CWE

CWE-264 - Permissions, Privileges, and Access Controls

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.

References

▼	URL	Tags
	https://guix.gnu.org/en/blog/2021/risk-of-local-privilege-escalation-via-guix-daemon/	x_refsource_MISC
	https://bugs.gnu.org/47229	x_refsource_MISC

Impacted products

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

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
Confirmed: The vulnerability is confirmed from an analyst perspective.
Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
Patched: This vulnerability was successfully patched by the user reporting the sighting.
Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
Not confirmed: The user expresses doubt about the veracity of the vulnerability.
Not patched: This vulnerability was not successfully patched by the user reporting the sighting.

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