CVE-2021-43566

NameCVE-2021-43566
DescriptionAll 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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub advisories/code/issues, web search, more)
Debian Bugs1004691

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
samba (PTS)buster, buster (security)2:4.9.5+dfsg-5+deb10u3vulnerable
bullseye (security), bullseye2:4.13.13+dfsg-1~deb11u5fixed
bookworm, sid2:4.17.3+dfsg-3fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
sambasourceexperimental2:4.16.0+dfsg-1
sambasourcebullseye2:4.13.13+dfsg-1~deb11u4
sambasource(unstable)2:4.16.0+dfsg-21004691

Notes

[buster] - samba <ignored> (Minor issue; no backport to older versions, mitigations exists)
https://www.samba.org/samba/security/CVE-2021-43566.html
https://bugzilla.samba.org/show_bug.cgi?id=13979

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