CVE-2020-8903

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Summary

CVECVE-2020-8903
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2020-06-22 14:15:00 UTC
Updated2022-09-30 23:06:00 UTC
DescriptionA 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.

Risk And Classification

Problem Types: CWE-276

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Google Guest-oslogin All All All All
Operating System Opensuse Leap 15.1 All All All
Operating System Opensuse Leap 15.2 All All All

References

ReferenceSourceLinkTags
[security-announce] openSUSE-SU-2020:1014-1: important: Security update SUSE lists.opensuse.org
oslogin-privesc-june-2020 · master · GitLab.com / GitLab Security Department / GitLab Red Team / Red Team Tech Notes · GitLab MISC gitlab.com Exploit, Third Party Advisory
Google Cloud Platform Security Bulletins  |  Support MISC cloud.google.com Vendor Advisory
Remove OS Login users from admin groups. by illfelder · Pull Request #29 · GoogleCloudPlatform/guest-oslogin · GitHub CONFIRM github.com Patch, Third Party Advisory
[security-announce] openSUSE-SU-2020:0996-1: important: Security update SUSE lists.opensuse.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

LEGACY: Chris Moberly

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