CVE-2023-3899

Subscription-manager: inadequate authorization of com.redhat.rhsm1 d-bus interface allows local users to modify configuration

Description

A vulnerability was found in subscription-manager that allows local privilege escalation due to inadequate authorization. The D-Bus interface com.redhat.RHSM1 exposes a significant number of methods to all users that could change the state of the registration. By using the com.redhat.RHSM1.Config.SetAll() method, a low-privileged local user could tamper with the state of the registration, by unregistering the system or by changing the current entitlements. This flaw allows an attacker to set arbitrary configuration directives for /etc/rhsm/rhsm.conf, which can be abused to cause a local privilege escalation to an unconfined root.

Remediation

Workaround:

  • A workaround is to mask rhsm.service using: ~~~ systemctl mask rhsm.service ~~~ When the rhsm.service is masked, then no D-Bus call cannot trigger the service and all D-Bus calls will be terminated with error: "Call failed: Could not activate remote peer." But then all applications using D-Bus API will not work until you unmask the service using: "systemctl unmask rhsm.service"

Categories

7.8
CVSS
Severity: High
CVSS 3.1 •
EPSS 0.03%
Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory redhat.com
Affected: Red Hat Red Hat Enterprise Linux 7
Affected: Red Hat Red Hat Enterprise Linux 8
Affected: Red Hat Red Hat Enterprise Linux 8
Affected: Red Hat Red Hat Enterprise Linux 8.1 Update Services for SAP Solutions
Affected: Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support
Affected: Red Hat Red Hat Enterprise Linux 8.2 Telecommunications Update Service
Affected: Red Hat Red Hat Enterprise Linux 8.2 Update Services for SAP Solutions
Affected: Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
Affected: Red Hat Red Hat Enterprise Linux 8.4 Telecommunications Update Service
Affected: Red Hat Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions
Affected: Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support
Affected: Red Hat Red Hat Enterprise Linux 9
Affected: Red Hat Red Hat Enterprise Linux 9.0 Extended Update Support
Affected: Red Hat Red Hat Enterprise Linux 6
Published at:
Updated at:

References

Link Tags
https://access.redhat.com/errata/RHSA-2023:4701 vendor advisory
https://access.redhat.com/errata/RHSA-2023:4702 vendor advisory
https://access.redhat.com/errata/RHSA-2023:4703 vendor advisory
https://access.redhat.com/errata/RHSA-2023:4704 vendor advisory
https://access.redhat.com/errata/RHSA-2023:4705 vendor advisory
https://access.redhat.com/errata/RHSA-2023:4706 vendor advisory
https://access.redhat.com/errata/RHSA-2023:4707 vendor advisory
https://access.redhat.com/errata/RHSA-2023:4708 vendor advisory
https://access.redhat.com/security/cve/CVE-2023-3899 vdb entry vendor advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2225407 vendor advisory issue tracking
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FJHKSBBZRDFOBNDU35FUKMYQIQYT6UJQ/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZDIHGNLS3TZVX7X2F735OKI4KXPY4AH6/

Frequently Asked Questions

What is the severity of CVE-2023-3899?
CVE-2023-3899 has been scored as a high severity vulnerability.
How to fix CVE-2023-3899?
As a workaround for remediating CVE-2023-3899: A workaround is to mask rhsm.service using: ~~~ systemctl mask rhsm.service ~~~ When the rhsm.service is masked, then no D-Bus call cannot trigger the service and all D-Bus calls will be terminated with error: "Call failed: Could not activate remote peer." But then all applications using D-Bus API will not work until you unmask the service using: "systemctl unmask rhsm.service"
Is CVE-2023-3899 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2023-3899 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2023-3899?
CVE-2023-3899 affects Red Hat Red Hat Enterprise Linux 7, Red Hat Red Hat Enterprise Linux 8, Red Hat Red Hat Enterprise Linux 8, Red Hat Red Hat Enterprise Linux 8.1 Update Services for SAP Solutions, Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support, Red Hat Red Hat Enterprise Linux 8.2 Telecommunications Update Service, Red Hat Red Hat Enterprise Linux 8.2 Update Services for SAP Solutions, Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support, Red Hat Red Hat Enterprise Linux 8.4 Telecommunications Update Service, Red Hat Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions, Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support, Red Hat Red Hat Enterprise Linux 9, Red Hat Red Hat Enterprise Linux 9.0 Extended Update Support, Red Hat Red Hat Enterprise Linux 6.
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