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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

In general, a standard system update will make all the necessary changes.

Related notices

  • USN-4611-1: samba-dsdb-modules, registry-tools, libparse-pidl-perl, libwbclient-dev, samba-dev, libnss-winbind, libsmbclient, libsmbclient-dev, libpam-winbind, smbclient, samba-common, python3-samba, samba-testsuite, samba-libs, ctdb, python-samba, samba-vfs-modules, winbind, libwbclient0, samba, samba-common-bin
  • USN-4930-1: samba-dsdb-modules, registry-tools, libparse-pidl-perl, libwbclient-dev, samba-dev, libnss-winbind, libsmbclient, libsmbclient-dev, libpam-winbind, smbclient, samba-common, python3-samba, samba-testsuite, samba-libs, ctdb, python-samba, samba-vfs-modules, winbind, libwbclient0, samba, samba-common-bin