CVE-2021-43566

Summary

All versions of Samba prior to 4.13.16 are vulnerable to a malicious client using an SMB1 or NFS race to allow a directory to be created in an area of the server file system not exported under the share definition. Note that SMB1 has to be enabled, or the share also available via NFS in order for this attack to succeed.

Impact & exploitability

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N

Affected products we track (1)

Recommendation

Apply the vendor fix in your normal patch cycle. Open any affected product above for its exact safe version.

Official patch: https://www.samba.org/samba/security/CVE-2021-43566.html ↗

Additional information

• NVD record
• https://www.samba.org/samba/security/CVE-2021-43566.htmlPatch
• https://bugzilla.samba.org/show_bug.cgi?id=13979Advisory
• https://security.netapp.com/advisory/ntap-20220110-0001/Advisory