[ASA-202009-17] samba: access restriction bypass
Morten Linderud
foxboron at archlinux.org
Tue Oct 6 20:11:53 UTC 2020
Arch Linux Security Advisory ASA-202009-17
==========================================
Severity: Medium
Date : 2020-09-29
CVE-ID : CVE-2020-1472
Package : samba
Type : access restriction bypass
Remote : Yes
Link : https://security.archlinux.org/AVG-1236
Summary
=======
The package samba before version 4.13.0-1 is vulnerable to access
restriction bypass.
Resolution
==========
Upgrade to 4.13.0-1.
# pacman -Syu "samba>=4.13.0-1"
The problem has been fixed upstream in version 4.13.0.
Workaround
==========
Ensure you do not have an schannel directive and if you do make sure
it's either = yes or = auto.
Description
===========
A flaw was found in the Microsoft Windows Netlogon Remote Protocol (MS-
NRPC), where it reuses a known, static, zero-value initialization
vector (IV) in AES-CFB8 mode. This flaw allows an unauthenticated
attacker to impersonate a domain-joined computer, including a domain
controller, and possibly obtain domain administrator privileges. The
highest threat from this vulnerability is to confidentiality,
integrity, as well as system availability.
Impact
======
An unauthenticated attacker can gain administrator access through
crafted traffic, if the samba server is configured to run with a
vulnerable schannel directive.
References
==========
https://bugs.archlinux.org/task/67983
https://www.samba.org/samba/security/CVE-2020-1472.html
https://security.archlinux.org/CVE-2020-1472
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