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AUSCERT External Security Bulletin Redistribution
USN-4931-1: Samba vulnerabilities
4 May 2021
AusCERT Security Bulletin Summary
Operating System: Ubuntu
Impact/Access: Increased Privileges -- Existing Account
Denial of Service -- Existing Account
Access Confidential Data -- Existing Account
Unauthorised Access -- Existing Account
Reduced Security -- Existing Account
CVE Names: CVE-2021-20254 CVE-2020-14383 CVE-2020-14323
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USN-4931-1: Samba vulnerabilities
03 May 2021
Several security issues were fixed in Samba.
o Ubuntu 14.04 ESM
o samba - SMB/CIFS file, print, and login server for Unix
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 Blazquez 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 )
The problem can be corrected by updating your system to the following package
o samba - 2:4.3.11+dfsg-0ubuntu0.14.04.20+esm11
Available with UA Infra or UA Desktop
In general, a standard system update will make all the necessary changes.
o USN-4930-1 : samba
o USN-4611-1 : samba
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