CVE - CVE-2020-8903

CVE-ID
CVE-2020-8903	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
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 "adm" group, users with this role are able to read the DHCP XID from the systemd journal. Using the DHCP XID, it is then possible to set the IP address and hostname of the instance to any value, which is then stored in /etc/hosts. An attacker can then point metadata.google.internal to an arbitrary IP address and impersonate the GCE metadata server which make it is possible to instruct the OS Login PAM module to grant 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 "adm" user from the OS Login entry.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://cloud.google.com/support/bulletins/#gcp-2020-008 URL:https://cloud.google.com/support/bulletins/#gcp-2020-008 MISC:https://github.com/GoogleCloudPlatform/guest-oslogin/pull/29 URL:https://github.com/GoogleCloudPlatform/guest-oslogin/pull/29 MISC:https://gitlab.com/gitlab-com/gl-security/gl-redteam/red-team-tech-notes/-/tree/master/oslogin-privesc-june-2020 URL:https://gitlab.com/gitlab-com/gl-security/gl-redteam/red-team-tech-notes/-/tree/master/oslogin-privesc-june-2020 MISC:openSUSE-SU-2020:0996 URL:http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00037.html MISC:openSUSE-SU-2020:1014 URL:http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00047.html
Assigning CNA
Google LLC
Date Record Created
20200212	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20200212)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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