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USN-4454-1: Samba vulnerability

10 August 2020

Samba could be made to crash if it received specially crafted network traffic.



  • samba - SMB/CIFS file, print, and login server for Unix


Martin von Wittich and Wilko Meyer discovered that Samba incorrectly
handled certain empty UDP packets when being used as a AD DC NBT server. A
remote attacker could possibly use this issue to cause Samba to crash,
resulting in a denial of service.

Update instructions

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

Ubuntu 20.04
Ubuntu 18.04
Ubuntu 16.04

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


Related notices

  • USN-4454-2: libpam-winbind, samba-common, smbclient, samba-dsdb-modules, libparse-pidl-perl, samba, libwbclient0, libpam-smbpass, samba-common-bin, samba-doc, samba-doc-pdf, libnss-winbind, samba-tools, winbind, libsmbsharemodes0, swat, libsmbsharemodes-dev, libsmbclient-dev, samba-libs, libsmbclient, libwbclient-dev, registry-tools, samba-testsuite, python-samba, samba-vfs-modules, samba-dev