Описание
Samba before versions 4.6.1, 4.5.7 and 4.4.11 are vulnerable to a malicious client using a symlink race to allow access to areas of the server file system not exported under the share definition.
A race condition was found in samba server. A malicious samba client could use this flaw to access files and directories in areas of the server file system not exported under the share definitions.
Меры по смягчению последствий
Add the parameter: unix extensions = no to the [global] section of your smb.conf and restart smbd. This prevents SMB1 clients from creating symlinks on the exported file system using SMB1. However, if the same region of the file system is also exported using NFS, NFS clients can create symlinks that potentially can also hit the race condition. For non-patched versions of Samba we recommend only exporting areas of the file system by either SMB or NFS, not both.
Затронутые пакеты
| Платформа | Пакет | Состояние | Рекомендация | Релиз |
|---|---|---|---|---|
| Red Hat Enterprise Linux 5 | samba | Will not fix | ||
| Red Hat Enterprise Linux 5 | samba3x | Will not fix | ||
| Red Hat Enterprise Linux 6 | samba4 | Affected | ||
| Red Hat Enterprise Linux 6 | samba | Fixed | RHSA-2017:2789 | 21.09.2017 |
| Red Hat Enterprise Linux 7 | samba | Fixed | RHSA-2017:1265 | 22.05.2017 |
| Red Hat Gluster Storage 3.2 for RHEL 7 | samba | Fixed | RHSA-2017:2338 | 01.08.2017 |
| Red Hat Gluster Storage 3.3 for RHEL 6 | libldb | Fixed | RHSA-2017:2778 | 21.09.2017 |
| Red Hat Gluster Storage 3.3 for RHEL 6 | libtalloc | Fixed | RHSA-2017:2778 | 21.09.2017 |
| Red Hat Gluster Storage 3.3 for RHEL 6 | libtdb | Fixed | RHSA-2017:2778 | 21.09.2017 |
| Red Hat Gluster Storage 3.3 for RHEL 6 | libtevent | Fixed | RHSA-2017:2778 | 21.09.2017 |
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Дополнительная информация
Статус:
EPSS
5.9 Medium
CVSS3
Связанные уязвимости
Samba before versions 4.6.1, 4.5.7 and 4.4.11 are vulnerable to a malicious client using a symlink race to allow access to areas of the server file system not exported under the share definition.
Samba before versions 4.6.1, 4.5.7 and 4.4.11 are vulnerable to a malicious client using a symlink race to allow access to areas of the server file system not exported under the share definition.
Samba before versions 4.6.1, 4.5.7 and 4.4.11 are vulnerable to a mali ...
EPSS
5.9 Medium
CVSS3