Improper Authentication in Prosody - CVE-2021-32919
Published: May 17, 2021
Vulnerability identifier: #VU53315
CSH Severity: Medium
CVSS v4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-32919
CWE-ID: CWE-287
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to bypass authentication process.
The vulnerability exists due to an error in when processing authentication requests. The undocumented dialback_without_dialback option in mod_dialback enables an experimental feature for server-to-server authentication. It does not correctly authenticate remote server certificates, allowing a remote server to impersonate another server.
Affected software
Prosody
Gentoo Linux
Arch Linux
Fedora
prosody (Debian package)
prosody
Gentoo Linux
Arch Linux
Fedora
prosody (Debian package)
prosody
How to mitigate CVE-2021-32919
Install updates from vendor's website.
Prosody - update to 0.11.9
prosody (Debian package) - update to 0.11.2-1+deb10u1
prosody - addressed in versions 0.11.9-1.el7, 0.11.9-1.el8, 0.11.9-1.fc32, 0.11.9-1.fc33, 0.11.9-1.fc34
prosody (Debian package) - update to 0.11.2-1+deb10u1
prosody - addressed in versions 0.11.9-1.el7, 0.11.9-1.el8, 0.11.9-1.fc32, 0.11.9-1.fc33, 0.11.9-1.fc34