Incorrect Default Permissions Affecting gce-compute-image-packages package, versions <20190801-0ubuntu1.1


Severity

Recommended
medium

Based on Ubuntu security rating.

Threat Intelligence

EPSS
0.08% (36th percentile)

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  • Snyk IDSNYK-UBUNTU1910-GCECOMPUTEIMAGEPACKAGES-581178
  • published23 Jun 2020
  • disclosed22 Jun 2020

Introduced: 22 Jun 2020

CVE-2020-8903  (opens in a new tab)
CWE-276  (opens in a new tab)

How to fix?

Upgrade Ubuntu:19.10 gce-compute-image-packages to version 20190801-0ubuntu1.1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream gce-compute-image-packages package and not the gce-compute-image-packages package as distributed by Ubuntu. See How to fix? for Ubuntu:19.10 relevant fixed versions and status.

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.

CVSS Scores

version 3.1