Subject: [ASA-202101-1] rsync: man-in-the-middle

Arch Linux Security Advisory ASA-202101-1
=========================================

Severity: High
Date    : 2021-01-04
CVE-ID  : CVE-2020-14387
Package : rsync
Type    : man-in-the-middle
Remote  : Yes
Link    : https://security.archlinux.org/AVG-1374

Summary
=======

The package rsync before version 3.2.3-2 is vulnerable to man-in-the-
middle.

Resolution
==========

Upgrade to 3.2.3-2.

# pacman -Syu "rsync>=3.2.3-2"

The problem has been fixed upstream but no release is available yet.

Workaround
==========

None.

Description
===========

A flaw was found in rsync version 3.2.0pre1 to 3.2.4. rsync-ssl does
not verify the hostname in the server certificate in openssl mode, so a
remote, unauthenticated man-in-the-middle attacker with a valid
certificate for another hostname could intercept connections.

Impact
======

A remote, unauthenticated attacker in position of man-in-the-middle
with a valid certificate for another hostname can intercept
connections.

References
==========

https://bugs.archlinux.org/task/69051
https://bugzilla.redhat.com/show_bug.cgi?id=1875549
https://git.samba.org/?p=rsync.git;a=commitdiff;h=c3f7414c450faaf6a8281cc4a4403529aeb7d859
https://security.archlinux.org/CVE-2020-14387