Vulnerability Details : CVE-2020-8907
Potential exploit
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.
Products affected by CVE-2020-8907
- Google » Guest-osloginVersions from including (>=) 20190304.00 and up to, including, (<=) 20200507.00cpe:2.3:a:google:guest-oslogin:*:*:*:*:*:*:*:*
- cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*
- cpe:2.3:o:opensuse:leap:15.2:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2020-8907
0.08%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 33 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2020-8907
Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
---|---|---|---|---|---|---|
6.9
|
MEDIUM | AV:L/AC:M/Au:N/C:C/I:C/A:C |
3.4
|
10.0
|
NIST | |
7.8
|
HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
1.8
|
5.9
|
Google Inc. | |
7.8
|
HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
1.8
|
5.9
|
NIST |
CWE ids for CVE-2020-8907
-
During installation, installed file permissions are set to allow anyone to modify those files.Assigned by:
- cve-coordination@google.com (Secondary)
- nvd@nist.gov (Primary)
References for CVE-2020-8907
-
https://cloud.google.com/support/bulletins/#gcp-2020-008
Google Cloud Platform Security Bulletins | SupportVendor Advisory
-
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00047.html
[security-announce] openSUSE-SU-2020:1014-1: important: Security updateMailing List;Third Party Advisory
-
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00037.html
[security-announce] openSUSE-SU-2020:0996-1: important: Security updateMailing List;Third Party Advisory
-
https://gitlab.com/gitlab-com/gl-security/gl-redteam/red-team-tech-notes/-/tree/master/oslogin-privesc-june-2020
oslogin-privesc-june-2020 · master · GitLab.com / GitLab Security Department / GitLab Red Team / Red Team Tech Notes · GitLabExploit;Third Party Advisory
-
https://github.com/GoogleCloudPlatform/guest-oslogin/pull/29
Remove OS Login users from admin groups. by illfelder · Pull Request #29 · GoogleCloudPlatform/guest-oslogin · GitHubPatch;Third Party Advisory
Jump to