USN-5174-1: Samba vulnerabilities
6 December 2021
Several security issues were fixed in Samba.
Releases
Packages
- samba - SMB/CIFS file, print, and login server for Unix
Details
Stefan Metzmacher discovered that Samba incorrectly handled SMB1 client
connections. A remote attacker could possibly use this issue to downgrade
connections to plaintext authentication. (CVE-2016-2124)
Andrew Bartlett discovered that Samba incorrectly mapping domain users to
local users. An authenticated attacker could possibly use this issue to
become root on domain members. (CVE-2020-25717)
Andrew Bartlett discovered that Samba did not properly check sensitive
attributes. An authenticated attacker could possibly use this issue to
escalate privileges. (CVE-2020-25722)
Joseph Sutton discovered that Samba incorrectly handled certain TGS
requests. An authenticated attacker could possibly use this issue to cause
Samba to crash, resulting in a denial of service. (CVE-2021-3671)
The fix for CVE-2020-25717 results in possible behaviour changes that could
affect certain environments. Please see the upstream advisory for more
information:
Update instructions
The problem can be corrected by updating your system to the following package versions:
Ubuntu 18.04
In general, a standard system update will make all the necessary changes.
References
Related notices
- USN-5142-1: libsmbclient-dev, smbclient, samba-dsdb-modules, libpam-winbind, libnss-winbind, libwbclient-dev, samba, libwbclient0, registry-tools, libsmbclient, samba-common, samba-libs, samba-common-bin, winbind, python3-samba, ctdb, samba-testsuite, samba-vfs-modules, samba-dev
- USN-5675-1: heimdal-clients, libheimntlm0-heimdal, libkadm5clnt7-heimdal, libhx509-5-heimdal, heimdal-multidev, libgssapi3-heimdal, heimdal-dev, libroken18-heimdal, heimdal-servers, heimdal-servers-x, libkafs0-heimdal, heimdal-docs, heimdal-clients-x, libheimbase1-heimdal, heimdal-kcm, libkdc2-heimdal, libasn1-8-heimdal, heimdal, libhcrypto4-heimdal, heimdal-kdc, libsl0-heimdal, libwind0-heimdal, libhdb9-heimdal, libotp0-heimdal, libkrb5-26-heimdal, libkadm5srv8-heimdal