Search criteria ⓘ Use full-text search for keyword queries.
Combine vendor, product, and sources to narrow results.
Enable “Apply ordering” to sort by dates instead of relevance.

1 vulnerability by GNU Guix

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

Vulnerability from cvelistv5 – Published: 2021-04-26 15:35 – Updated: 2024-09-17 02:11
VLAI?
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
References
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)
Create a notification for this product.
Date Public ?
2021-03-18 00:00
Credits
Nathan Nye of WhiteBeam Security
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-03T21:33:15.927Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://guix.gnu.org/en/blog/2021/risk-of-local-privilege-escalation-via-guix-daemon/"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://bugs.gnu.org/47229"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "guix-daemon",
          "vendor": "GNU Guix",
          "versions": [
            {
              "lessThan": "unspecified",
              "status": "affected",
              "version": "v0.11.0-3298-g2608e40988",
              "versionType": "custom"
            },
            {
              "lessThan": "v1.2.0-75109-g94f0312546",
              "status": "affected",
              "version": "unspecified",
              "versionType": "custom"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "Nathan Nye of WhiteBeam Security"
        }
      ],
      "datePublic": "2021-03-18T00:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-264",
              "description": "CWE-264 Permissions, Privileges, and Access Controls",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2021-04-26T15:35:28.000Z",
        "orgId": "37e5125f-f79b-445b-8fad-9564f167944b",
        "shortName": "certcc"
      },
      "references": [
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://guix.gnu.org/en/blog/2021/risk-of-local-privilege-escalation-via-guix-daemon/"
        },
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://bugs.gnu.org/47229"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "Local privilege escalation in GNU Guix via guix-daemon and \u0027--keep-failed\u0027",
      "x_generator": {
        "engine": "Vulnogram 0.0.9"
      },
      "x_legacyV4Record": {
        "CVE_data_meta": {
          "ASSIGNER": "cert@cert.org",
          "DATE_PUBLIC": "2021-03-18T00:00:00.000Z",
          "ID": "CVE-2021-27851",
          "STATE": "PUBLIC",
          "TITLE": "Local privilege escalation in GNU Guix via guix-daemon and \u0027--keep-failed\u0027"
        },
        "affects": {
          "vendor": {
            "vendor_data": [
              {
                "product": {
                  "product_data": [
                    {
                      "product_name": "guix-daemon",
                      "version": {
                        "version_data": [
                          {
                            "version_affected": "\u003e=",
                            "version_value": "v0.11.0-3298-g2608e40988"
                          },
                          {
                            "version_affected": "\u003c",
                            "version_value": "v1.2.0-75109-g94f0312546"
                          }
                        ]
                      }
                    }
                  ]
                },
                "vendor_name": "GNU Guix"
              }
            ]
          }
        },
        "credit": [
          {
            "lang": "eng",
            "value": "Nathan Nye of WhiteBeam Security"
          }
        ],
        "data_format": "MITRE",
        "data_type": "CVE",
        "data_version": "4.0",
        "description": {
          "description_data": [
            {
              "lang": "eng",
              "value": "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."
            }
          ]
        },
        "generator": {
          "engine": "Vulnogram 0.0.9"
        },
        "problemtype": {
          "problemtype_data": [
            {
              "description": [
                {
                  "lang": "eng",
                  "value": "CWE-264 Permissions, Privileges, and Access Controls"
                }
              ]
            }
          ]
        },
        "references": {
          "reference_data": [
            {
              "name": "https://guix.gnu.org/en/blog/2021/risk-of-local-privilege-escalation-via-guix-daemon/",
              "refsource": "MISC",
              "url": "https://guix.gnu.org/en/blog/2021/risk-of-local-privilege-escalation-via-guix-daemon/"
            },
            {
              "name": "https://bugs.gnu.org/47229",
              "refsource": "MISC",
              "url": "https://bugs.gnu.org/47229"
            }
          ]
        },
        "source": {
          "discovery": "UNKNOWN"
        }
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "37e5125f-f79b-445b-8fad-9564f167944b",
    "assignerShortName": "certcc",
    "cveId": "CVE-2021-27851",
    "datePublished": "2021-04-26T15:35:28.989Z",
    "dateReserved": "2021-03-01T00:00:00.000Z",
    "dateUpdated": "2024-09-17T02:11:05.201Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}