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CVE-2021-43566

Status Candidate

Overview

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.

Related Files

Ubuntu Security Notice USN-5260-1
Posted Feb 1, 2022
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5260-1 - Orange Tsai discovered that the Samba vfs_fruit module incorrectly handled certain memory operations. A remote attacker could use this issue to cause Samba to crash, resulting in a denial of service, or possibly execute arbitrary code as root. Michael Hanselmann discovered that Samba incorrectly created directories. In certain configurations, a remote attacker could possibly create a directory on the server outside of the shared directory.

tags | advisory, remote, denial of service, arbitrary, root
systems | linux, ubuntu
advisories | CVE-2021-43566, CVE-2021-44142, CVE-2022-0336
SHA-256 | 1150766a9f5acaee9066e266cb394d5fcb11a48e64845279538c22bdac77ac58
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