Описание
An issue was discovered in the Linux kernel before 5.0.4. There is a use-after-free upon attempted read access to /proc/ioports after the ipmi_si module is removed, related to drivers/char/ipmi/ipmi_si_intf.c, drivers/char/ipmi/ipmi_si_mem_io.c, and drivers/char/ipmi/ipmi_si_port_io.c.
A flaw was found in the Linux kernel's implementation of IPMI (remote baseband access). An attacker, with local access to read /proc/ioports, may be able to create a use-after-free condition when the kernel module is unloaded which may result in privilege escalation.
Отчет
This flaw has been rated as "Moderate" as the attacker needs to be able to abuse this flaw in a very narrow race condition of the kernel module being unloaded. This scoring system from this flaw differentiates from other sources as the attacker must have a local account to be able to read the file (/proc/ioports) while the module is unloaded. None of the above actions are 'network facing' attack vectors.
Меры по смягчению последствий
A mitigation to this flaw would be to no longer use IPMI on affected hardware until the kernel has been updated. Existing systems that have IPMI kernel modules loaded will need to unload the "ipmi_si" kernel module and blacklist ( See https://access.redhat.com/solutions/41278 for a guide on how to blacklist modules). Take careful consideration that if unloading and blacklisting the module, this creates a one-time attack vector window for a local attacker.
Затронутые пакеты
| Платформа | Пакет | Состояние | Рекомендация | Релиз |
|---|---|---|---|---|
| Red Hat Enterprise Linux 5 | kernel | Not affected | ||
| Red Hat Enterprise Linux 6 | kernel | Not affected | ||
| Red Hat Enterprise Linux 7 | kernel-rt | Fixed | RHSA-2019:1891 | 29.07.2019 |
| Red Hat Enterprise Linux 7 | kernel | Fixed | RHSA-2019:1873 | 29.07.2019 |
| Red Hat Enterprise Linux 7 | kernel-alt | Fixed | RHSA-2020:2854 | 07.07.2020 |
| Red Hat Enterprise Linux 7.4 Advanced Update Support | kernel | Fixed | RHSA-2019:4058 | 03.12.2019 |
| Red Hat Enterprise Linux 7.4 Telco Extended Update Support | kernel | Fixed | RHSA-2019:4058 | 03.12.2019 |
| Red Hat Enterprise Linux 7.4 Update Services for SAP Solutions | kernel | Fixed | RHSA-2019:4058 | 03.12.2019 |
| Red Hat Enterprise Linux 7.5 Extended Update Support | kernel | Fixed | RHSA-2020:0036 | 07.01.2020 |
| Red Hat Enterprise Linux 8 | kernel-rt | Fixed | RHSA-2019:1971 | 30.07.2019 |
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Дополнительная информация
Статус:
EPSS
7 High
CVSS3
Связанные уязвимости
An issue was discovered in the Linux kernel before 5.0.4. There is a use-after-free upon attempted read access to /proc/ioports after the ipmi_si module is removed, related to drivers/char/ipmi/ipmi_si_intf.c, drivers/char/ipmi/ipmi_si_mem_io.c, and drivers/char/ipmi/ipmi_si_port_io.c.
An issue was discovered in the Linux kernel before 5.0.4. There is a use-after-free upon attempted read access to /proc/ioports after the ipmi_si module is removed, related to drivers/char/ipmi/ipmi_si_intf.c, drivers/char/ipmi/ipmi_si_mem_io.c, and drivers/char/ipmi/ipmi_si_port_io.c.
An issue was discovered in the Linux kernel before 5.0.4. There is a u ...
An issue was discovered in the Linux kernel before 5.0.4. There is a use-after-free upon attempted read access to /proc/ioports after the ipmi_si module is removed, related to drivers/char/ipmi/ipmi_si_intf.c, drivers/char/ipmi/ipmi_si_mem_io.c, and drivers/char/ipmi/ipmi_si_port_io.c.
Уязвимость драйверов drivers/char/ipmi/ipmi_si_intf.c, drivers/char/ipmi/ipmi_si_mem_io.c и drivers/char/ipmi/ipmi_si_port_io.c ядра операционной системы Linux, позволяющая нарушителю выполнить произвольный код или вызвать отказ в обслуживании
EPSS
7 High
CVSS3