Horde IMP v4.3.7 and lower are subject to a cross site scripting (XSS) vulnerability:
The fetchmailprefs.php script fails to properly sanitize user supplied input to the 'fm_id' URL parameter. If exploited, injected code will be persistent (persistent XSS) and will execute once the user (manually) accesses mail fetching preferences.
The following URL can be used as a proof of concept: > [path_to_horde_imp]/fetchmailprefs.php?actionID=fetchmail_prefs_save&fm_driver=imap&fm_id=zzz%22%3E%3Cscript%3Ealert%28%27XSS%27%29%3C%2Fscript%3E%3Cx+y%3D%22&fm_protocol=pop3&fm_lmailbox=INBOX&save=Create
Prior authentication to IMP is required for immediate exploitation. Follow-up authentication is also possible if the victims' IMP configuration has folder maintenance options disabled.
This issue has been fixed by Jan Schneider of the Horde Project: > http://git.horde.org/diff.php/imp/fetchmailprefs.php?rt=horde&r1=126.96.36.199&r2=188.8.131.52
According to him, Horde IMP v4.3.8 (or a release candidate) which fixes this issue is to be released within the week. Release announcements will likely be communicated through http://lists.horde.org/mailman/listinfo/announce
Credits for this discovery:
Moritz Naumann Naumann IT Security Consulting, Berlin, Germany http://moritz-naumann.com
Thanks for reading,
-- Naumann IT Security Consulting Samariterstr. 16 10247 Berlin Germany
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