Race condition in the XMPP library in Smack before 4.1.9,...

Vulnerability Description

Race condition in the XMPP library in Smack before 4.1.9, when the SecurityMode.required TLS setting has been set, allows man-in-the-middle attackers to bypass TLS protections and trigger use of cleartext for client authentication by stripping the "starttls" feature from a server response.

References

• https://github.com/igniterealtime/Smack/commit/059ee99ba0d5ff7758829acf5a9aeede09ec820b
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/J4WXAZ4JVJXHMEDDXJVWJHPVBF5QCTZF/
• http://www.securityfocus.com/bid/95129
• https://issues.igniterealtime.org/projects/SMACK/issues/SMACK-739
• https://github.com/igniterealtime/Smack/commit/a9d5cd4a611f47123f9561bc5a81a4555fe7cb04
• http://www.openwall.com/lists/oss-security/2016/12/22/12
• https://community.igniterealtime.org/blogs/ignite/2016/11/22/smack-security-advisory-2016-11-22