Vulnerability Monitor

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CVE-2020-8907

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.

Published

2020-06-22T14:15:11.753

Last Modified

2024-11-21T05:39:39.933

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 7.8 (HIGH)

CVSSv2 Vector

AV:L/AC:M/Au:N/C:C/I:C/A:C

Access Vector: LOCAL
Access Complexity: MEDIUM
Authentication: NONE
Confidentiality Impact: COMPLETE
Integrity Impact: COMPLETE
Availability Impact: COMPLETE

Exploitability Score

3.4

Impact Score

10.0

Weaknesses

Type: Secondary
CWE-276
Type: Primary
CWE-276

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	google	guest-oslogin	≤ 20200507.00	Yes
Operating System	opensuse	leap	15.1	Yes
Operating System	opensuse	leap	15.2	Yes

References

http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00037.html Mailing List, Third Party Advisory ([email protected])
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00047.html Mailing List, Third Party Advisory ([email protected])
https://cloud.google.com/support/bulletins/#gcp-2020-008 Vendor Advisory ([email protected])
https://github.com/GoogleCloudPlatform/guest-oslogin/pull/29 Patch, Third Party Advisory ([email protected])
https://gitlab.com/gitlab-com/gl-security/gl-redteam/red-team-tech-notes/-/tree/master/oslogin-privesc-june-2020 Exploit, Third Party Advisory ([email protected])
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00037.html Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00047.html Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://cloud.google.com/support/bulletins/#gcp-2020-008 Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/GoogleCloudPlatform/guest-oslogin/pull/29 Patch, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://gitlab.com/gitlab-com/gl-security/gl-redteam/red-team-tech-notes/-/tree/master/oslogin-privesc-june-2020 Exploit, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)