Описание
An issue was discovered in the Linux kernel before 5.0.10. SMB2_write in fs/cifs/smb2pdu.c has a use-after-free.
An flaw was discovered in the Linux kernel's CIFS client implementation. While issuing an SMB2_write, a value can be used after it was intended to be freed when CIFS function tracing is enabled. Even though the data is used after being freed, using it to for privilege escalation does not seem possible.
Меры по смягчению последствий
As the CIFS module will be auto-loaded when required, its use can be disabled by preventing the module from loading with the following instructions:
echo "install cifs /bin/true" >> /etc/modprobe.d/disable-cifs.conf
The system will need to be restarted if the CIFS modules are loaded. In most circumstances, the CIFS kernel modules will be unable to be unloaded while any network interfaces are active and the protocol is in use. If you need further assistance, see KCS article https://access.redhat.com/solutions/41278 or contact Red Hat Global Support Services.
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 | Not affected | ||
| Red Hat Enterprise Linux 7 | kernel-alt | Not affected | ||
| Red Hat Enterprise Linux 7 | kernel-rt | Not affected | ||
| Red Hat Enterprise Linux 8 | kernel-rt | Affected | ||
| Red Hat Enterprise MRG 2 | kernel-rt | Not affected | ||
| Red Hat Enterprise Linux 8 | kernel | Fixed | RHSA-2019:3517 | 05.11.2019 |
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Дополнительная информация
Статус:
7.8 High
CVSS3
Связанные уязвимости
An issue was discovered in the Linux kernel before 5.0.10. SMB2_write in fs/cifs/smb2pdu.c has a use-after-free.
An issue was discovered in the Linux kernel before 5.0.10. SMB2_write in fs/cifs/smb2pdu.c has a use-after-free.
An issue was discovered in the Linux kernel before 5.0.10. SMB2_write ...
An issue was discovered in the Linux kernel before 5.0.10. SMB2_write in fs/cifs/smb2pdu.c has a use-after-free.
Уязвимость функции SMB2_write (fs/cifs/smb2pdu.c) ядра операционной системы Linux, позволяющая нарушителю раскрыть защищаемую информацию
7.8 High
CVSS3