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<div class="header-wrap">
<h1 class="project__header__title">Snyk test report</h1>
<p class="timestamp">January 25th 2022, 8:49:29 pm</p>
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<div class="source-panel">
<span>Scanned the following path:</span>
<ul>
<li class="paths">/Users/mattbrown/Desktop/DemoPrograms/snyk-juice-shop (npm)</li>
</ul>
</div>
<div class="meta-counts">
<div class="meta-count"><span>40</span> <span>known vulnerabilities</span></div>
<div class="meta-count"><span>51 vulnerable dependency paths</span></div>
<div class="meta-count"><span>893</span> <span>dependencies</span></div>
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<table class="metatable">
<tbody>
<tr class="meta-row"><th class="meta-row-label">Project</th> <td class="meta-row-value">juice-shop</td></tr>
<tr class="meta-row"><th class="meta-row-label">Path</th> <td class="meta-row-value">/Users/mattbrown/Desktop/DemoPrograms/snyk-juice-shop</td></tr>
<tr class="meta-row"><th class="meta-row-label">Package Manager</th> <td class="meta-row-value">npm</td></tr>
<tr class="meta-row"><th class="meta-row-label">Manifest</th> <td class="meta-row-value">package.json</td></tr>
</tbody>
</table>
</section>
<div class="layout-container" style="padding-top: 35px;">
<div class="cards--vuln filter--patch filter--ignore">
<div class="card card--vuln disclosure--not-new severity--critical" data-snyk-test="critical">
<h2 class="card__title">Sandbox Bypass</h2>
<div class="card__section">
<div class="label label--critical">
<span class="label__text">critical severity</span>
</div>
<hr/>
<ul class="card__meta">
<li class="card__meta__item">
Package Manager: npm
</li>
<li class="card__meta__item">
Vulnerable module:
vm2
</li>
<li class="card__meta__item">Introduced through:
juice-shop@12.3.0, juicy-chat-bot@0.6.5 and others
</li>
</ul>
<hr/>
<h3 class="card__section__title">Detailed paths</h3>
<ul class="card__meta__paths">
<li>
<span class="list-paths__item__introduced"><em>Introduced through</em>:
juice-shop@12.3.0
<span class="list-paths__item__arrow">›</span>
juicy-chat-bot@0.6.5
<span class="list-paths__item__arrow">›</span>
vm2@3.9.3
</span>
</li>
</ul><!-- .list-paths -->
</div><!-- .card__section -->
<hr/>
<!-- Overview -->
<h2 id="overview">Overview</h2>
<p><a href="https://github.com/patriksimek/vm2#readme">vm2</a> is a sandbox that can run untrusted code with whitelisted Node's built-in modules.</p>
<p>Affected versions of this package are vulnerable to Sandbox Bypass via a Prototype Pollution attack vector, which can lead to execution of arbitrary code on the host machine.</p>
<h3 id="poc">PoC</h3>
<pre><code>const {VM} = require("vm2");
let vmInstance = new VM();
let code = `
res = eval('import(\\'./foo.js\\');')
res.__proto__.__proto__.polluted = res.__proto__.__proto__.toString.constructor("return this")().process.mainModule.require("child_process").execSync("touch HACKED").toString();
`;
vmInstance.run(code);
console.log(polluted);
</code></pre>
<h2 id="details">Details</h2>
<p>Prototype Pollution is a vulnerability affecting JavaScript. Prototype Pollution refers to the ability to inject properties into existing JavaScript language construct prototypes, such as objects. JavaScript allows all Object attributes to be altered, including their magical attributes such as <code>_proto_</code>, <code>constructor</code> and <code>prototype</code>. An attacker manipulates these attributes to overwrite, or pollute, a JavaScript application object prototype of the base object by injecting other values. Properties on the <code>Object.prototype</code> are then inherited by all the JavaScript objects through the prototype chain. When that happens, this leads to either denial of service by triggering JavaScript exceptions, or it tampers with the application source code to force the code path that the attacker injects, thereby leading to remote code execution.</p>
<p>There are two main ways in which the pollution of prototypes occurs:</p>
<ul>
<li>Unsafe <code>Object</code> recursive merge</li>
<li>Property definition by path</li>
</ul>
<h3 id="unsafe-object-recursive-merge">Unsafe Object recursive merge</h3>
<p>The logic of a vulnerable recursive merge function follows the following high-level model:</p>
<pre><code>merge (target, source)
foreach property of source
if property exists and is an object on both the target and the source
merge(target[property], source[property])
else
target[property] = source[property]
</code></pre>
<br>
<p>When the source object contains a property named <code>_proto_</code> defined with <code>Object.defineProperty()</code> , the condition that checks if the property exists and is an object on both the target and the source passes and the merge recurses with the target, being the prototype of <code>Object</code> and the source of <code>Object</code> as defined by the attacker. Properties are then copied on the <code>Object</code> prototype.</p>
<p>Clone operations are a special sub-class of unsafe recursive merges, which occur when a recursive merge is conducted on an empty object: <code>merge({},source)</code>.</p>
<p><code>lodash</code> and <code>Hoek</code> are examples of libraries susceptible to recursive merge attacks.</p>
<h3 id="property-definition-by-path">Property definition by path</h3>
<p>There are a few JavaScript libraries that use an API to define property values on an object based on a given path. The function that is generally affected contains this signature: <code>theFunction(object, path, value)</code></p>
<p>If the attacker can control the value of “path”, they can set this value to <code>_proto_.myValue</code>. <code>myValue</code> is then assigned to the prototype of the class of the object.</p>
<h2 id="types-of-attacks">Types of attacks</h2>
<p>There are a few methods by which Prototype Pollution can be manipulated:</p>
<table>
<thead>
<tr>
<th>Type</th>
<th>Origin</th>
<th>Short description</th>
</tr>
</thead>
<tbody><tr>
<td><strong>Denial of service (DoS)</strong></td>
<td>Client</td>
<td>This is the most likely attack. <br>DoS occurs when <code>Object</code> holds generic functions that are implicitly called for various operations (for example, <code>toString</code> and <code>valueOf</code>). <br> The attacker pollutes <code>Object.prototype.someattr</code> and alters its state to an unexpected value such as <code>Int</code> or <code>Object</code>. In this case, the code fails and is likely to cause a denial of service. <br><strong>For example:</strong> if an attacker pollutes <code>Object.prototype.toString</code> by defining it as an integer, if the codebase at any point was reliant on <code>someobject.toString()</code> it would fail.</td>
</tr>
<tr>
<td><strong>Remote Code Execution</strong></td>
<td>Client</td>
<td>Remote code execution is generally only possible in cases where the codebase evaluates a specific attribute of an object, and then executes that evaluation.<br><strong>For example:</strong> <code>eval(someobject.someattr)</code>. In this case, if the attacker pollutes <code>Object.prototype.someattr</code> they are likely to be able to leverage this in order to execute code.</td>
</tr>
<tr>
<td><strong>Property Injection</strong></td>
<td>Client</td>
<td>The attacker pollutes properties that the codebase relies on for their informative value, including security properties such as cookies or tokens.<br> <strong>For example:</strong> if a codebase checks privileges for <code>someuser.isAdmin</code>, then when the attacker pollutes <code>Object.prototype.isAdmin</code> and sets it to equal <code>true</code>, they can then achieve admin privileges.</td>
</tr>
</tbody></table>
<h2 id="affected-environments">Affected environments</h2>
<p>The following environments are susceptible to a Prototype Pollution attack:</p>
<ul>
<li>Application server</li>
<li>Web server</li>
</ul>
<h2 id="how-to-prevent">How to prevent</h2>
<ol>
<li>Freeze the prototype— use <code>Object.freeze (Object.prototype)</code>.</li>
<li>Require schema validation of JSON input.</li>
<li>Avoid using unsafe recursive merge functions.</li>
<li>Consider using objects without prototypes (for example, <code>Object.create(null)</code>), breaking the prototype chain and preventing pollution.</li>
<li> As a best practice use <code>Map</code> instead of <code>Object</code>.</li>
</ol>
<h3 id="for-more-information-on-this-vulnerability-type">For more information on this vulnerability type:</h3>
<p><a href="https://github.com/HoLyVieR/prototype-pollution-nsec18/blob/master/paper/JavaScript_prototype_pollution_attack_in_NodeJS.pdf">Arteau, Oliver. “JavaScript prototype pollution attack in NodeJS application.” GitHub, 26 May 2018</a></p>
<h2 id="remediation">Remediation</h2>
<p>Upgrade <code>vm2</code> to version 3.9.4 or higher.</p>
<h2 id="references">References</h2>
<ul>
<li><a href="https://github.com/patriksimek/vm2/commit/b4f6e2bd2c4a1ef52fc4483d8e35f28bc4481886">GitHub Commit</a></li>
<li><a href="https://github.com/patriksimek/vm2/issues/363">GitHub Issue</a></li>
<li><a href="https://github.com/patriksimek/vm2/releases/tag/3.9.4">GitHub Release</a></li>
</ul>
<hr/>
<div class="cta card__cta">
<p><a href="https://snyk.io/vuln/SNYK-JS-VM2-1585918">More about this vulnerability</a></p>
</div>
</div><!-- .card -->
<div class="card card--vuln disclosure--not-new severity--critical" data-snyk-test="critical">
<h2 class="card__title">Arbitrary Code Execution</h2>
<div class="card__section">
<div class="label label--critical">
<span class="label__text">critical severity</span>
</div>
<hr/>
<ul class="card__meta">
<li class="card__meta__item">
Package Manager: npm
</li>
<li class="card__meta__item">
Vulnerable module:
sanitize-html
</li>
<li class="card__meta__item">Introduced through:
juice-shop@12.3.0 and sanitize-html@1.4.2
</li>
</ul>
<hr/>
<h3 class="card__section__title">Detailed paths</h3>
<ul class="card__meta__paths">
<li>
<span class="list-paths__item__introduced"><em>Introduced through</em>:
juice-shop@12.3.0
<span class="list-paths__item__arrow">›</span>
sanitize-html@1.4.2
</span>
</li>
</ul><!-- .list-paths -->
</div><!-- .card__section -->
<hr/>
<!-- Overview -->
<h2 id="overview">Overview</h2>
<p><a href="https://github.com/punkave/sanitize-html">sanitize-html</a> is a library that allows you to clean up user-submitted HTML, preserving whitelisted elements and whitelisted attributes on a per-element basis</p>
<p>Affected versions of this package are vulnerable to Arbitrary Code Execution. Tag transformations which turn an attribute value into a text node using <code>transformTags</code> could be vulnerable to code execution.</p>
<h2 id="remediation">Remediation</h2>
<p>Upgrade <code>sanitize-html</code> to version 2.0.0-beta or higher.</p>
<h2 id="references">References</h2>
<ul>
<li><a href="https://github.com/apostrophecms/sanitize-html/pull/156">GitHub PR</a></li>
</ul>
<hr/>
<div class="cta card__cta">
<p><a href="https://snyk.io/vuln/SNYK-JS-SANITIZEHTML-585892">More about this vulnerability</a></p>
</div>
</div><!-- .card -->
<div class="card card--vuln disclosure--not-new severity--critical" data-snyk-test="critical">
<h2 class="card__title">Arbitrary Code Injection</h2>
<div class="card__section">
<div class="label label--critical">
<span class="label__text">critical severity</span>
</div>
<hr/>
<ul class="card__meta">
<li class="card__meta__item">
Package Manager: npm
</li>
<li class="card__meta__item">
Vulnerable module:
marsdb
</li>
<li class="card__meta__item">Introduced through:
juice-shop@12.3.0 and marsdb@0.6.11
</li>
</ul>
<hr/>
<h3 class="card__section__title">Detailed paths</h3>
<ul class="card__meta__paths">
<li>
<span class="list-paths__item__introduced"><em>Introduced through</em>:
juice-shop@12.3.0
<span class="list-paths__item__arrow">›</span>
marsdb@0.6.11
</span>
</li>
</ul><!-- .list-paths -->
</div><!-- .card__section -->
<hr/>
<!-- Overview -->
<h2 id="overview">Overview</h2>
<p><a href="https://github.com/c58/marsdb">marsdb</a> is a MarsDB is a lightweight client-side database.</p>
<p>Affected versions of this package are vulnerable to Arbitrary Code Injection. In the <code>DocumentMatcher</code> class, selectors on <code>$where</code> clauses are passed to a Function constructor unsanitized. This allows attackers to run arbitrary commands in the system when the function is executed.</p>
<h2 id="remediation">Remediation</h2>
<p>There is no fixed version for <code>marsdb</code>.</p>
<h2 id="references">References</h2>
<ul>
<li><a href="https://www.npmjs.com/advisories/1122">NPM Security Advisory</a></li>
</ul>
<hr/>
<div class="cta card__cta">
<p><a href="https://snyk.io/vuln/SNYK-JS-MARSDB-480405">More about this vulnerability</a></p>
</div>
</div><!-- .card -->
<div class="card card--vuln disclosure--not-new severity--critical" data-snyk-test="critical">
<h2 class="card__title">Prototype Pollution</h2>
<div class="card__section">
<div class="label label--critical">
<span class="label__text">critical severity</span>
</div>
<hr/>
<ul class="card__meta">
<li class="card__meta__item">
Package Manager: npm
</li>
<li class="card__meta__item">
Vulnerable module:
lodash
</li>
<li class="card__meta__item">Introduced through:
juice-shop@12.3.0, sanitize-html@1.4.2 and others
</li>
</ul>
<hr/>
<h3 class="card__section__title">Detailed paths</h3>
<ul class="card__meta__paths">
<li>
<span class="list-paths__item__introduced"><em>Introduced through</em>:
juice-shop@12.3.0
<span class="list-paths__item__arrow">›</span>
sanitize-html@1.4.2
<span class="list-paths__item__arrow">›</span>
lodash@2.4.2
</span>
</li>
</ul><!-- .list-paths -->
</div><!-- .card__section -->
<hr/>
<!-- Overview -->
<h2 id="overview">Overview</h2>
<p><a href="https://www.npmjs.com/package/lodash">lodash</a> is a modern JavaScript utility library delivering modularity, performance, & extras.</p>
<p>Affected versions of this package are vulnerable to Prototype Pollution in <code>zipObjectDeep</code> due to an incomplete fix for <a href="https://snyk.io/vuln/SNYK-JS-LODASH-567746">CVE-2020-8203</a>.</p>
<h2 id="details">Details</h2>
<p>Prototype Pollution is a vulnerability affecting JavaScript. Prototype Pollution refers to the ability to inject properties into existing JavaScript language construct prototypes, such as objects. JavaScript allows all Object attributes to be altered, including their magical attributes such as <code>_proto_</code>, <code>constructor</code> and <code>prototype</code>. An attacker manipulates these attributes to overwrite, or pollute, a JavaScript application object prototype of the base object by injecting other values. Properties on the <code>Object.prototype</code> are then inherited by all the JavaScript objects through the prototype chain. When that happens, this leads to either denial of service by triggering JavaScript exceptions, or it tampers with the application source code to force the code path that the attacker injects, thereby leading to remote code execution.</p>
<p>There are two main ways in which the pollution of prototypes occurs:</p>
<ul>
<li>Unsafe <code>Object</code> recursive merge</li>
<li>Property definition by path</li>
</ul>
<h3 id="unsafe-object-recursive-merge">Unsafe Object recursive merge</h3>
<p>The logic of a vulnerable recursive merge function follows the following high-level model:</p>
<pre><code>merge (target, source)
foreach property of source
if property exists and is an object on both the target and the source
merge(target[property], source[property])
else
target[property] = source[property]
</code></pre>
<br>
<p>When the source object contains a property named <code>_proto_</code> defined with <code>Object.defineProperty()</code> , the condition that checks if the property exists and is an object on both the target and the source passes and the merge recurses with the target, being the prototype of <code>Object</code> and the source of <code>Object</code> as defined by the attacker. Properties are then copied on the <code>Object</code> prototype.</p>
<p>Clone operations are a special sub-class of unsafe recursive merges, which occur when a recursive merge is conducted on an empty object: <code>merge({},source)</code>.</p>
<p><code>lodash</code> and <code>Hoek</code> are examples of libraries susceptible to recursive merge attacks.</p>
<h3 id="property-definition-by-path">Property definition by path</h3>
<p>There are a few JavaScript libraries that use an API to define property values on an object based on a given path. The function that is generally affected contains this signature: <code>theFunction(object, path, value)</code></p>
<p>If the attacker can control the value of “path”, they can set this value to <code>_proto_.myValue</code>. <code>myValue</code> is then assigned to the prototype of the class of the object.</p>
<h2 id="types-of-attacks">Types of attacks</h2>
<p>There are a few methods by which Prototype Pollution can be manipulated:</p>
<table>
<thead>
<tr>
<th>Type</th>
<th>Origin</th>
<th>Short description</th>
</tr>
</thead>
<tbody><tr>
<td><strong>Denial of service (DoS)</strong></td>
<td>Client</td>
<td>This is the most likely attack. <br>DoS occurs when <code>Object</code> holds generic functions that are implicitly called for various operations (for example, <code>toString</code> and <code>valueOf</code>). <br> The attacker pollutes <code>Object.prototype.someattr</code> and alters its state to an unexpected value such as <code>Int</code> or <code>Object</code>. In this case, the code fails and is likely to cause a denial of service. <br><strong>For example:</strong> if an attacker pollutes <code>Object.prototype.toString</code> by defining it as an integer, if the codebase at any point was reliant on <code>someobject.toString()</code> it would fail.</td>
</tr>
<tr>
<td><strong>Remote Code Execution</strong></td>
<td>Client</td>
<td>Remote code execution is generally only possible in cases where the codebase evaluates a specific attribute of an object, and then executes that evaluation.<br><strong>For example:</strong> <code>eval(someobject.someattr)</code>. In this case, if the attacker pollutes <code>Object.prototype.someattr</code> they are likely to be able to leverage this in order to execute code.</td>
</tr>
<tr>
<td><strong>Property Injection</strong></td>
<td>Client</td>
<td>The attacker pollutes properties that the codebase relies on for their informative value, including security properties such as cookies or tokens.<br> <strong>For example:</strong> if a codebase checks privileges for <code>someuser.isAdmin</code>, then when the attacker pollutes <code>Object.prototype.isAdmin</code> and sets it to equal <code>true</code>, they can then achieve admin privileges.</td>
</tr>
</tbody></table>
<h2 id="affected-environments">Affected environments</h2>
<p>The following environments are susceptible to a Prototype Pollution attack:</p>
<ul>
<li>Application server</li>
<li>Web server</li>
</ul>
<h2 id="how-to-prevent">How to prevent</h2>
<ol>
<li>Freeze the prototype— use <code>Object.freeze (Object.prototype)</code>.</li>
<li>Require schema validation of JSON input.</li>
<li>Avoid using unsafe recursive merge functions.</li>
<li>Consider using objects without prototypes (for example, <code>Object.create(null)</code>), breaking the prototype chain and preventing pollution.</li>
<li> As a best practice use <code>Map</code> instead of <code>Object</code>.</li>
</ol>
<h3 id="for-more-information-on-this-vulnerability-type">For more information on this vulnerability type:</h3>
<p><a href="https://github.com/HoLyVieR/prototype-pollution-nsec18/blob/master/paper/JavaScript_prototype_pollution_attack_in_NodeJS.pdf">Arteau, Oliver. “JavaScript prototype pollution attack in NodeJS application.” GitHub, 26 May 2018</a></p>
<h2 id="remediation">Remediation</h2>
<p>Upgrade <code>lodash</code> to version 4.17.20 or higher.</p>
<h2 id="references">References</h2>
<ul>
<li><a href="https://github.com/lodash/lodash/issues/4874">GitHub Issue</a></li>
</ul>
<hr/>
<div class="cta card__cta">
<p><a href="https://snyk.io/vuln/SNYK-JS-LODASH-590103">More about this vulnerability</a></p>
</div>
</div><!-- .card -->
<div class="card card--vuln disclosure--not-new severity--high" data-snyk-test="high">
<h2 class="card__title">Regular Expression Denial of Service (ReDoS)</h2>
<div class="card__section">
<div class="label label--high">
<span class="label__text">high severity</span>
</div>
<hr/>
<ul class="card__meta">
<li class="card__meta__item">
Package Manager: npm
</li>
<li class="card__meta__item">
Vulnerable module:
underscore.string
</li>
<li class="card__meta__item">Introduced through:
juice-shop@12.3.0, grunt@1.4.1 and others
</li>
</ul>
<hr/>
<h3 class="card__section__title">Detailed paths</h3>
<ul class="card__meta__paths">
<li>
<span class="list-paths__item__introduced"><em>Introduced through</em>:
juice-shop@12.3.0
<span class="list-paths__item__arrow">›</span>
grunt@1.4.1
<span class="list-paths__item__arrow">›</span>
grunt-legacy-util@2.0.1
<span class="list-paths__item__arrow">›</span>
underscore.string@3.3.5
</span>
</li>
</ul><!-- .list-paths -->
</div><!-- .card__section -->
<hr/>
<!-- Overview -->
<h2 id="overview">Overview</h2>
<p><a href="https://www.npmjs.com/package/underscore.string">underscore.string</a> is a Javascript lacks complete string manipulation operations.</p>
<p>Affected versions of this package are vulnerable to Regular Expression Denial of Service (ReDoS). It parses dates using regex strings, which may cause a slowdown of 2 seconds per 50k characters.</p>
<h2 id="details">Details</h2>
<p>Denial of Service (DoS) describes a family of attacks, all aimed at making a system inaccessible to its original and legitimate users. There are many types of DoS attacks, ranging from trying to clog the network pipes to the system by generating a large volume of traffic from many machines (a Distributed Denial of Service - DDoS - attack) to sending crafted requests that cause a system to crash or take a disproportional amount of time to process.</p>
<p>The Regular expression Denial of Service (ReDoS) is a type of Denial of Service attack. Regular expressions are incredibly powerful, but they aren't very intuitive and can ultimately end up making it easy for attackers to take your site down.</p>
<p>Let’s take the following regular expression as an example:</p>
<pre><code class="language-js">regex = /A(B|C+)+D/
</code></pre>
<p>This regular expression accomplishes the following:</p>
<ul>
<li><code>A</code> The string must start with the letter 'A'</li>
<li><code>(B|C+)+</code> The string must then follow the letter A with either the letter 'B' or some number of occurrences of the letter 'C' (the <code>+</code> matches one or more times). The <code>+</code> at the end of this section states that we can look for one or more matches of this section.</li>
<li><code>D</code> Finally, we ensure this section of the string ends with a 'D'</li>
</ul>
<p>The expression would match inputs such as <code>ABBD</code>, <code>ABCCCCD</code>, <code>ABCBCCCD</code> and <code>ACCCCCD</code></p>
<p>It most cases, it doesn't take very long for a regex engine to find a match:</p>
<pre><code class="language-bash">$ time node -e '/A(B|C+)+D/.test("ACCCCCCCCCCCCCCCCCCCCCCCCCCCCD")'
0.04s user 0.01s system 95% cpu 0.052 total
$ time node -e '/A(B|C+)+D/.test("ACCCCCCCCCCCCCCCCCCCCCCCCCCCCX")'
1.79s user 0.02s system 99% cpu 1.812 total
</code></pre>
<p>The entire process of testing it against a 30 characters long string takes around ~52ms. But when given an invalid string, it takes nearly two seconds to complete the test, over ten times as long as it took to test a valid string. The dramatic difference is due to the way regular expressions get evaluated.</p>
<p>Most Regex engines will work very similarly (with minor differences). The engine will match the first possible way to accept the current character and proceed to the next one. If it then fails to match the next one, it will backtrack and see if there was another way to digest the previous character. If it goes too far down the rabbit hole only to find out the string doesn’t match in the end, and if many characters have multiple valid regex paths, the number of backtracking steps can become very large, resulting in what is known as <em>catastrophic backtracking</em>.</p>
<p>Let's look at how our expression runs into this problem, using a shorter string: "ACCCX". While it seems fairly straightforward, there are still four different ways that the engine could match those three C's:</p>
<ol>
<li>CCC</li>
<li>CC+C</li>
<li>C+CC</li>
<li>C+C+C.</li>
</ol>
<p>The engine has to try each of those combinations to see if any of them potentially match against the expression. When you combine that with the other steps the engine must take, we can use <a href="https://regex101.com/debugger">RegEx 101 debugger</a> to see the engine has to take a total of 38 steps before it can determine the string doesn't match.</p>
<p>From there, the number of steps the engine must use to validate a string just continues to grow.</p>
<table>
<thead>
<tr>
<th>String</th>
<th align="right">Number of C's</th>
<th align="right">Number of steps</th>
</tr>
</thead>