USN-4931-1: Samba vulnerabilities
3 May 2021
Several security issues were fixed in Samba.
Releases
Packages
- samba - SMB/CIFS file, print, and login server for Unix
Details
Steven French discovered that Samba incorrectly handled ChangeNotify
permissions. A remote attacker could possibly use this issue to obtain file
name information. (CVE-2020-14318)
Bas Alberts discovered that Samba incorrectly handled certain winbind
requests. A remote attacker could possibly use this issue to cause winbind
to crash, resulting in a denial of service. (CVE-2020-14323)
Francis Brosnan Blázquez discovered that Samba incorrectly handled certain
invalid DNS records. A remote attacker could possibly use this issue to
cause the DNS server to crash, resulting in a denial of service.
(CVE-2020-14383)
Peter Eriksson discovered that Samba incorrectly handled certain negative
idmap cache entries. This issue could result in certain users gaining
unauthorized access to files, contrary to expected behaviour.
(CVE-2021-20254)
Update instructions
The problem can be corrected by updating your system to the following package versions:
Ubuntu 14.04
-
samba
-
2:4.3.11+dfsg-0ubuntu0.14.04.20+esm11
Available with Ubuntu Pro
In general, a standard system update will make all the necessary changes.
References
Related notices
- USN-4611-1: samba, smbclient, samba-libs, libsmbclient, python3-samba, samba-dsdb-modules, samba-testsuite, registry-tools, winbind, samba-common, libparse-pidl-perl, libpam-winbind, ctdb, libwbclient-dev, samba-vfs-modules, python-samba, libsmbclient-dev, samba-common-bin, samba-dev, libwbclient0, libnss-winbind
- USN-4930-1: samba, smbclient, samba-libs, libsmbclient, python3-samba, samba-dsdb-modules, samba-testsuite, registry-tools, winbind, samba-common, libparse-pidl-perl, libpam-winbind, ctdb, libwbclient-dev, samba-vfs-modules, python-samba, libsmbclient-dev, samba-common-bin, samba-dev, libwbclient0, libnss-winbind