A flaw was found in PolicyKit (aka polkit) 0.115 that allows a user with a uid greater than INT_MAX to successfully execute any systemctl command.
The MITRE CVE dictionary describes this issue as:
Find out more about CVE-2018-19788 from the MITRE CVE dictionary dictionary and NIST NVD.
This issue affects the versions of polkit as shipped with Red Hat Enterprise Linux 6 and 7.
Red Hat Enterprise Linux 6 is now in Maintenance Support 2 Phase of the support and maintenance life cycle. This has been rated as having a security impact of Moderate, and is not currently planned to be addressed in future updates. For additional information, refer to the Red Hat Enterprise Linux Life Cycle: https://access.redhat.com/support/policy/updates/errata/.
This issue affects the versions of polkit as shipped with Red Hat Virtualization 4. System users beyond those created at installation time are typically not used in Red Hat Virtualization Hypervisor or Management Appliance hosts, nor is there any opportunity to accidentally or maliciously create a user with a dangerous uid/gid on these systems under normal operation. For Red Hat Virtualization, this vulnerability has been rated as having a security impact of Low. Future updates may address this issue.
NOTE: The following CVSS v3 metrics and score provided are preliminary and subject to review.
| CVSS3 Base Score | 7 |
|---|---|
| CVSS3 Base Metrics | CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |
| Attack Vector | Local |
| Attack Complexity | High |
| Privileges Required | Low |
| User Interaction | None |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity Impact | High |
| Availability Impact | High |
| Platform | Package | State |
|---|---|---|
| Red Hat Virtualization 4 | rhvm-appliance | Will not fix |
| Red Hat Virtualization 4 | redhat-virtualization-host | Will not fix |
| Red Hat Enterprise Linux 7 | polkit | Affected |
| Red Hat Enterprise Linux 6 | polkit | Will not fix |
Do not allow negative UIDs or UIDs greater than 2147483646.
Vulmon