Vulnerability-Lookup

UBUNTU-CVE-2020-8907 (CVE-2020-8907)

Vulnerability from osv_ubuntu – Published: 2020-06-22 14:15 – Updated: 2025-10-24 04:48 – Source website

Details

A vulnerability in Google Cloud Platform's guest-oslogin versions between 20190304 and 20200507 allows a user that is only granted the role "roles/compute.osLogin" to escalate privileges to root. Using their membership to the "docker" group, an attacker with this role is able to run docker and mount the host OS. Within docker, it is possible to modify the host OS filesystem and modify /etc/groups to gain administrative privileges. All images created after 2020-May-07 (20200507) are fixed, and if you cannot update, we recommend you edit /etc/group/security.conf and remove the "docker" user from the OS Login entry.

Severity

7.8 (High)


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

9.3 (Critical)


                    
                      CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2020-8907	REPORT
	https://cloud.google.com/support/bulletins/#gcp-2…	REPORT
	https://github.com/GoogleCloudPlatform/guest-oslo…	REPORT
	https://gitlab.com/gitlab-com/gl-security/gl-redt…	REPORT
	https://www.cve.org/CVERecord?id=CVE-2020-8907	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "gce-compute-image-packages",
            "binary_version": "20190315-0ubuntu1~14.04.0"
          },
          {
            "binary_name": "google-compute-engine-oslogin",
            "binary_version": "20190315-0ubuntu1~14.04.0"
          },
          {
            "binary_name": "python-google-compute-engine",
            "binary_version": "20190315-0ubuntu1~14.04.0"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:14.04:LTS",
        "name": "gce-compute-image-packages",
        "purl": "pkg:deb/ubuntu/gce-compute-image-packages@20190315-0ubuntu1~14.04.0?arch=source\u0026distro=trusty"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "20160930-0ubuntu3~14.04.0",
        "20160930-0ubuntu3~14.04.1",
        "20160930-0ubuntu3~14.04.2",
        "20160930-0ubuntu6~14.04.0",
        "20170426-0ubuntu2~14.04.0",
        "20170523-0ubuntu1~14.04.0",
        "20170622-0ubuntu1~14.04.0",
        "20170718-0ubuntu1~14.04.0",
        "20171019+dfsg1-0ubuntu1~14.04.0",
        "20171025+dfsg1-0ubuntu1~14.04.0",
        "20171129+dfsg1-0ubuntu1~14.04.0",
        "20180129+dfsg1-0ubuntu1~14.04.0",
        "20180510+dfsg1-0ubuntu3~14.04.3",
        "20180905+dfsg1-0ubuntu1~14.04.0",
        "20180905+dfsg1-0ubuntu1~14.04.1",
        "20190124+dfsg1-0ubuntu1~14.04.0",
        "20190315-0ubuntu1~14.04.0"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "gce-compute-image-packages",
            "binary_version": "20190801-0ubuntu1~16.04.1"
          },
          {
            "binary_name": "google-compute-engine-oslogin",
            "binary_version": "20190801-0ubuntu1~16.04.1"
          },
          {
            "binary_name": "python-google-compute-engine",
            "binary_version": "20190801-0ubuntu1~16.04.1"
          },
          {
            "binary_name": "python3-google-compute-engine",
            "binary_version": "20190801-0ubuntu1~16.04.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "gce-compute-image-packages",
        "purl": "pkg:deb/ubuntu/gce-compute-image-packages@20190801-0ubuntu1~16.04.1?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
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              "introduced": "0"
            },
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            }
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          "type": "ECOSYSTEM"
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        "20160930-0ubuntu3~16.04.0",
        "20160930-0ubuntu5~16.04.0",
        "20160930-0ubuntu6~16.04.0",
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        "20190124+dfsg1-0ubuntu1~16.04.0",
        "20190522-0ubuntu1~16.04.0",
        "20190801-0ubuntu1~16.04.0"
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    {
      "ecosystem_specific": {
        "availability": "No subscription required",
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            "binary_name": "google-compute-engine-oslogin",
            "binary_version": "20190801-0ubuntu1~18.04.1"
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      },
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            }
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      "versions": [
        "20190801-0ubuntu1",
        "20190801-0ubuntu2",
        "20190801-0ubuntu3",
        "20190801-0ubuntu4"
      ]
    }
  ],
  "aliases": [],
  "details": "A vulnerability in Google Cloud Platform\u0027s guest-oslogin versions between 20190304 and 20200507 allows a user that is only granted the role \"roles/compute.osLogin\" to escalate privileges to root. Using their membership to the \"docker\" group, an attacker with this role is able to run docker and mount the host OS. Within docker, it is possible to modify the host OS filesystem and modify /etc/groups to gain administrative privileges. All images created after 2020-May-07 (20200507) are fixed, and if you cannot update, we recommend you edit /etc/group/security.conf and remove the \"docker\" user from the OS Login entry.",
  "id": "UBUNTU-CVE-2020-8907",
  "modified": "2025-10-24T04:48:20Z",
  "published": "2020-06-22T14:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2020-8907"
    },
    {
      "type": "REPORT",
      "url": "https://cloud.google.com/support/bulletins/#gcp-2020-008"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/GoogleCloudPlatform/guest-oslogin/pull/29"
    },
    {
      "type": "REPORT",
      "url": "https://gitlab.com/gitlab-com/gl-security/gl-redteam/red-team-tech-notes/-/tree/master/oslogin-privesc-june-2020"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2020-8907"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H",
      "type": "CVSS_V4"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2020-8907"
  ]
}

CVE-2020-8907 (GCVE-0-2020-8907)

Vulnerability from cvelistv5 – Published: 2020-06-22 13:45 – Updated: 2024-08-04 10:12

Title

Priviged Escalation in Google Cloud Platform's Guest-OSLogin

Summary

Severity

9.3 (Critical)


                        
                          CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-05-21 14:20 UTC

CWE

CWE-276 - Incorrect Default Permissions

Assigner

Google Google root

References

5 references

URL	Tags
https://github.com/GoogleCloudPlatform/guest-oslo…	x_refsource_CONFIRM
https://gitlab.com/gitlab-com/gl-security/gl-redt…	x_refsource_MISC
https://cloud.google.com/support/bulletins/#gcp-2…	x_refsource_MISC
http://lists.opensuse.org/opensuse-security-annou…	vendor-advisoryx_refsource_SUSE
http://lists.opensuse.org/opensuse-security-annou…	vendor-advisoryx_refsource_SUSE

Impacted products

1 product

Vendor	Product	Version
Google LLC	guest-oslogin	Affected: 20190304 , < 20200507 (date) Unaffected: 20200507 (date)

Credits

Chris Moberly

Show details on NVD website

JSON

To clipboard

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    "assignerOrgId": "14ed7db2-1595-443d-9d34-6215bf890778",
    "assignerShortName": "Google",
    "cveId": "CVE-2020-8907",
    "datePublished": "2020-06-22T13:45:25.000Z",
    "dateReserved": "2020-02-12T00:00:00.000Z",
    "dateUpdated": "2024-08-04T10:12:10.984Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

Sightings

Author	Source	Type	Date	Other

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.