A Local Privilege Escalation (LPE) vulnerability was found in libblockdev. Generally, the allow_active setting in Polkit permits a physically present user to take certain actions based on the session type. Due to the way libblockdev interacts with the udisks daemon, an allow_active user on a system may be able escalate to full root privileges on the target host. Normally, udisks mounts user-provided filesystem images with security flags like nosuid and nodev to prevent privilege escalation. However, a local attacker can create a specially crafted XFS image containing a SUID-root shell, then trick udisks into resizing it. This mounts their malicious filesystem with root privileges, allowing them to execute their SUID-root shell and gain complete control of the system.
The product performs an operation at a privilege level that is higher than the minimum level required, which creates new weaknesses or amplifies the consequences of other weaknesses.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Red Hat Enterprise Linux 10 | RedHat | libblockdev-0:3.2.0-4.el10_0 | * |
| Red Hat Enterprise Linux 7 Extended Lifecycle Support | RedHat | libblockdev-0:2.18-5.el7_9.1 | * |
| Red Hat Enterprise Linux 8 | RedHat | libblockdev-0:2.28-7.el8_10 | * |
| Red Hat Enterprise Linux 8.2 Advanced Update Support | RedHat | libblockdev-0:2.19-13.el8_2 | * |
| Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support | RedHat | libblockdev-0:2.24-6.el8_4 | * |
| Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support | RedHat | libblockdev-0:2.24-9.el8_6 | * |
| Red Hat Enterprise Linux 8.6 Telecommunications Update Service | RedHat | libblockdev-0:2.24-9.el8_6 | * |
| Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions | RedHat | libblockdev-0:2.24-9.el8_6 | * |
| Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions | RedHat | libblockdev-0:2.28-3.el8_8 | * |
| Red Hat Enterprise Linux 9 | RedHat | libblockdev-0:2.28-14.el9_6 | * |
| Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions | RedHat | libblockdev-0:2.25-12.el9_0 | * |
| Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions | RedHat | libblockdev-0:2.28-5.el9_2 | * |
| Red Hat Enterprise Linux 9.4 Extended Update Support | RedHat | libblockdev-0:2.28-11.el9_4 | * |
| Libblockdev | Ubuntu | esm-infra/bionic | * |
| Libblockdev | Ubuntu | esm-infra/focal | * |
| Libblockdev | Ubuntu | jammy | * |
| Libblockdev | Ubuntu | noble | * |
| Libblockdev | Ubuntu | oracular | * |
| Libblockdev | Ubuntu | plucky | * |
| Udisks2 | Ubuntu | devel | * |
| Udisks2 | Ubuntu | esm-infra/bionic | * |
| Udisks2 | Ubuntu | esm-infra/focal | * |
| Udisks2 | Ubuntu | jammy | * |
| Udisks2 | Ubuntu | noble | * |
| Udisks2 | Ubuntu | oracular | * |
| Udisks2 | Ubuntu | plucky | * |
New weaknesses can be exposed because running with extra privileges, such as root or Administrator, can disable the normal security checks being performed by the operating system or surrounding environment. Other pre-existing weaknesses can turn into security vulnerabilities if they occur while operating at raised privileges. Privilege management functions can behave in some less-than-obvious ways, and they have different quirks on different platforms. These inconsistencies are particularly pronounced if you are transitioning from one non-root user to another. Signal handlers and spawned processes run at the privilege of the owning process, so if a process is running as root when a signal fires or a sub-process is executed, the signal handler or sub-process will operate with root privileges.