charybdis is vulnerable to authentication bypass. The m_authenticate
function in modules/m_sasl.c
allows remote attackers to spoof certificate fingerprints and consequently log in as another user via a malicious AUTHENTICATE parameter.
www.debian.org/security/2016/dsa-3661
www.openwall.com/lists/oss-security/2016/09/04/3
www.openwall.com/lists/oss-security/2016/09/05/8
www.securityfocus.com/bid/92761
github.com/charybdis-ircd/charybdis/blob/charybdis-3.5.3/NEWS.md
github.com/charybdis-ircd/charybdis/commit/818a3fda944b26d4814132cee14cfda4ea4aa824
security-tracker.debian.org/tracker/CVE-2016-7143