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AUSCERT External Security Bulletin Redistribution
ESB-2020.3188
USN-4510-1 and USN-4510-2: Samba vulnerability
18 September 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: Samba
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Root Compromise -- Remote/Unauthenticated
Access Privileged Data -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2020-1472
Reference: ASB-2020.0140
ASB-2020.0139
ESB-2020.3153
ESB-2020.3151
Original Bulletin:
https://usn.ubuntu.com/4510-1/
https://usn.ubuntu.com/4510-2/
Comment: This bulletin contains two (2) Ubuntu security advisories.
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USN-4510-1: Samba vulnerability
17 September 2020
Samba would allow unintended access to files over the network.
Releases
o Ubuntu 18.04 LTS
o Ubuntu 16.04 LTS
Packages
o samba - SMB/CIFS file, print, and login server for Unix
Details
Tom Tervoort discovered that the Netlogon protocol implemented by Samba
incorrectly handled the authentication scheme. A remote attacker could use
this issue to forge an authentication token and steal the credentials of
the domain admin.
This update fixes the issue by changing the "server schannel" setting to
default to "yes", instead of "auto", which will force a secure netlogon
channel. This may result in compatibility issues with older devices. A
future update may allow a finer-grained control over this setting.
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 18.04
o samba - 2:4.7.6+dfsg~ubuntu-0ubuntu2.19
Ubuntu 16.04
o samba - 2:4.3.11+dfsg-0ubuntu0.16.04.30
In general, a standard system update will make all the necessary changes.
References
o CVE-2020-1472
Related notices
o USN-4510-2 : samba
- --------------------------------------------------------------------------------
USN-4510-2: Samba vulnerability
17 September 2020
Samba would allow unintended access to files over the network.
Releases
o Ubuntu 14.04 ESM
Packages
o samba - SMB/CIFS file, print, and login server for Unix
Details
USN-4510-1 fixed a vulnerability in Samba. This update provides
the corresponding update for Ubuntu 14.04 ESM.
Original advisory details:
Tom Tervoort discovered that the Netlogon protocol implemented by Samba
incorrectly handled the authentication scheme. A remote attacker could use
this issue to forge an authentication token and steal the credentials of
the domain admin.
This update fixes the issue by changing the "server schannel" setting to
default to "yes", instead of "auto", which will force a secure netlogon
channel. This may result in compatibility issues with older devices. A
future update may allow a finer-grained control over this setting.
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 14.04
o samba - 2:4.3.11+dfsg-0ubuntu0.14.04.20+esm9
In general, a standard system update will make all the necessary changes.
References
o CVE-2020-1472
Related notices
o USN-4510-1 : samba
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