USN-4611-1: Samba vulnerabilities

Releases

• Ubuntu 20.10
• Ubuntu 20.04 LTS
• Ubuntu 18.04 ESM
• Ubuntu 16.04 ESM

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)

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 20.10

• samba - 2:4.12.5+dfsg-3ubuntu4.1

Ubuntu 20.04

• samba - 2:4.11.6+dfsg-0ubuntu1.6

Ubuntu 18.04

• samba - 2:4.7.6+dfsg~ubuntu-0ubuntu2.21

Ubuntu 16.04

• samba - 2:4.3.11+dfsg-0ubuntu0.16.04.32

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

References

• CVE-2020-14383
• CVE-2020-14318
• CVE-2020-14323

Related notices

• USN-4931-1: libnss-winbind, libwbclient0, samba-libs, libpam-smbpass, libpam-winbind, samba-common, samba-vfs-modules, libsmbclient-dev, smbclient, libparse-pidl-perl, samba-common-bin, samba-dsdb-modules, samba-testsuite, winbind, samba-dev, samba-doc, libsmbclient, libwbclient-dev, samba, python-samba, registry-tools, libsmbsharemodes0, libsmbsharemodes-dev