gce-compute-image-packages: A vulnerability in Google Cloud Platform's guest-oslogin versions between20190304 and 20200507 allows a user that is...
CVE-2020-8903 is fixed in 5 products on 1 platform, first by gce-compute-image-packages 20190801-0ubuntu1~18.04.1, released June 22, 2020. It is not reported as exploited. Patch Radar priority: Routine.
A vulnerability in Google Cloud Platform's guest-oslogin versions between20190304 and 20200507 allows a user that is only granted the role"roles/compute.osLogin" to escalate privileges to root. Using theirmembership to the "adm" group, users with this role are able to read theDHCP XID from the systemd journal. Using the DHCP XID, it is then possibleto set the IP address and hostname of the instance to any value, which isthen stored in /etc/hosts. An attacker can then pointmetadata.google.internal to an arbitrary IP address and impersonate the GCEmetadata server which make it is possible to instruct the OS Login PAMmodule to grant administrative privileges. All images created after2020-May-07 (20200507) are fixed, and if you cannot update, we recommendyou edit /etc/group/security.conf and remove the "adm" user from the OSLogin entry.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| gce-compute-image-packages · Ubuntu 18.04.6 LTS (bionic) | 20190801-0ubuntu1~18.04.1 | gce-compute-image-packages 20190801-0ubuntu1~18.04.1 | Jun 22, 2020 |
| gce-compute-image-packages · Ubuntu 20.04 LTS (focal) | 20190801-0ubuntu4.1 | gce-compute-image-packages 20190801-0ubuntu4.1 | Jun 22, 2020 |
| gce-compute-image-packages · Ubuntu 24.10 (oracular) | 20190801-0ubuntu5 | gce-compute-image-packages 20190801-0ubuntu5 | Jan 16, 2026 |
| gce-compute-image-packages · Ubuntu 25.04 (plucky) | 20190801-0ubuntu5 | gce-compute-image-packages 20190801-0ubuntu5 | Jan 16, 2026 |
| google-compute-engine · Ubuntu 24.10 (oracular) | 20190801-0ubuntu5 | google-compute-engine 20190801-0ubuntu5 | Jan 16, 2026 |
| google-compute-engine · Ubuntu 25.04 (plucky) | 20190801-0ubuntu5 | google-compute-engine 20190801-0ubuntu5 | Jan 16, 2026 |
| google-compute-engine-oslogin · Ubuntu 18.04.6 LTS (bionic) | 20190801-0ubuntu1~18.04.1 | google-compute-engine-oslogin 20190801-0ubuntu1~18.04.1 | Jun 22, 2020 |
| google-compute-engine-oslogin · Ubuntu 20.04 LTS (focal) | 20190801-0ubuntu4.1 | google-compute-engine-oslogin 20190801-0ubuntu4.1 | Jun 22, 2020 |
| python-google-compute-engine · Ubuntu 18.04.6 LTS (bionic) | 20190801-0ubuntu1~18.04.1 | python-google-compute-engine 20190801-0ubuntu1~18.04.1 | Jun 22, 2020 |
| python3-google-compute-engine · Ubuntu 18.04.6 LTS (bionic) | 20190801-0ubuntu1~18.04.1 | python3-google-compute-engine 20190801-0ubuntu1~18.04.1 | Jun 22, 2020 |
| python3-google-compute-engine · Ubuntu 20.04 LTS (focal) | 20190801-0ubuntu4.1 | python3-google-compute-engine 20190801-0ubuntu4.1 | Jun 22, 2020 |
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