Arch Linux Security Advisory ASA-202108-11
=========================================
Severity: Medium
Date    : 2021-08-10
CVE-ID  : CVE-2021-37601
Package : prosody
Type    : information disclosure
Remote  : Yes
Link    : https://security.archlinux.org/AVG-2237

Summary
======
The package prosody before version 1:0.11.10-1 is vulnerable to
information disclosure.

Resolution
=========
Upgrade to 1:0.11.10-1.

# pacman -Syu "prosody>=1:0.11.10-1"

The problem has been fixed upstream in version 0.11.10.

Workaround
=========
None.

Description
==========
It was discovered that Prosody 0.11.0 up to 0.11.9 exposes the list of
entities (Jabber/XMPP addresses) affiliated (part of) a Multi-User chat
to any user, even if they are currently not part of the chat or if
their affiliation would not let them become part of the chat, if the
whois room configuration was set to anyone. This allows any entity to
access the list of admins, members, owners and banned entities of any
federated XMPP group chat of which they know the address if it is
hosted on a vulnerable Prosody server.

Impact
=====
A remote attacker could disclose the list of admins, members, ownersand banned entities of any federated XMPP group chat of which they know
the address.

References
=========
https://bugs.archlinux.org/task/71641
https://prosody.im/security/advisory_20210722/
https://prosody.im/security/advisory_20210722/1.patch
https://hg.prosody.im/0.11/rev/d117b92fd8e4
https://security.archlinux.org/CVE-2021-37601