Summary
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.
Fixed packages 2
| Release | Package | Fixed in |
|---|---|---|
| Ubuntu · 16.04 LTS 16.04:LTS | samba | 2:4.3.11+dfsg-0ubuntu0.16.04.30 |
| Ubuntu · 18.04 LTS 18.04:LTS | samba | 2:4.7.6+dfsg~ubuntu-0ubuntu2.19 |
Vulnerabilities 1
-
Medium 5.5
Netlogon Elevation of Privilege Vulnerability
An elevation of privilege vulnerability exists when an attacker establishes a vulnerable Netlogon secure channel connection to a domain controller, using the Netlogon Remote Protocol (MS-NRPC). An attacker who successfully exploited the vulnerability could ru…
KEV Nov 3, 2021
References
-
report
https://ubuntu.com/security/CVE-2020-1472