by Kastro
Paper/Archive/CVE-2020-8907

CVE-2020-8907

Google LLC guest-oslogin — Priviged Escalation in Google Cloud Platform's Guest-OSLogin

EPSS 0.3%public exploitCVSS 9.3
critical.is priorityof 100
43
CVSS 9.3 (CNA)9.3 / 10 × 3027.9Not in CISA KEV+300.0EPSS percentile 23.8.238 × 204.8Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
guest-oslogin20190304 – < 2020050720200507CNA

Scores by source

Google (CNA)9.3CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
CISA ADPSSVCExploitation: poc · Automatable: no · Technical impact: total

References

refcloud.google.com/support/bulletins/#gcp-2020-008advisorylists.opensuse.org/opensuse-security-announce/2020-07/msg00037.htmladvisorylists.opensuse.org/opensuse-security-announce/2020-07/msg00047.htmlrefgithub.com/GoogleCloudPlatform/guest-oslogin/pull/29refgitlab.com/gitlab-com/gl-security/gl-redteam/red-team-tech-notes/-/tree/master/oslogin-privesc-june-2020