Executive brief
aioxmpp is a Python library for XMPP (Jabber) messaging. A depth counting error in the guard() function can lead to remote denial of service or malicious data injection into XMPP message streams. Applications using error-suppressing xso_error_handlers are vulnerable to exploitation.
Technical details
A depth counting error in the guard() function allows improper validation of XMPP stream structures, potentially leading to Denial of Service or Data Injection attacks. The vulnerability requires specific preconditions: an error-suppressing xso_error_handler must be in use. Remote attackers can exploit this via the XMPP protocol to cause denial of service or inject malicious data. The vulnerability affects all versions prior to 0.10.3, which contains the fix (PR #268).
Affected products
- aioxmpp aioxmpp < 0.10.3
Timeline
- 2019-05-23: disclosed
- 2019-05-23: patched: Version 0.10.3 released with fix