Arch Linux Security Advisory ASA-201410-13 ========================================== Severity: High Date : 2014-10-27 CVE-ID : CVE-2014-8760 Package : ejabberd Type : circumvention of encryption Remote : No Link : https://wiki.archlinux.org/index.php/CVE-2014 Summary ======= The package ejabberd before version 14.07-2 allows clients to connect with an unencrypted connection even if starttls_required is set. Resolution ========== Upgrade to 14.07-2. # pacman -Syu "ejabberd>=14.07-2" The problems have been fixed upstream [0] but no release version is available yet. Workaround ========== Disable compression ('zlib' in c2s configuration) and find affected users with: # ejabberdctl connected_users_info | grep 'c2s_compressed\s' You may kick affected user sessions and they should be able to reconnect with encryption and without compression. Description =========== It was discovered that ejabberd does not enforce the starttls_required setting when compression is used, which causes clients to unexpectedly establish connections without encryption. Impact ====== A local user can unexpectedly connect without any encryption and send sensitive information in plaintext to the server even if encryption was set as required. References ========== [0] https://github.com/processone/ejabberd/commit/7bdc115 http://mail.jabber.org/pipermail/operators/2014-October/002438.html https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-8760 https://bugs.archlinux.org/task/42541