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POWhere is the DOM based XSS
 

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    <p>I received an AppScan security report where the following piece of code was flagged as "DOM Based Cross-Site Scripting": </p> <pre><code>i !== null &amp;&amp; i.errors ? (i.errors[0].Key === "OrderNotFound" || i.errors[0].Key === "ShoppingCartModified") &amp;&amp; (alert(i.errors[0].Value), window.location.href = window.location.href.split("#")[0]) : t([s("GenericErrorMessage")]) </code></pre> <p>But I can't see where the problem is. I wonder if this could be a false positive. This is the original code without minification</p> <pre><code>if (jsonResult !== null &amp;&amp; jsonResult.errors) { if (jsonResult.errors[0].Key === "OrderNotFound" || jsonResult.errors[0].Key === "ShoppingCartModified") { alert(jsonResult.errors[0].Value); //the problem is here window.location.href = window.location.href.split("#")[0]; //or here } } else { //uiErrors is a KnockoutJS observableArray that is //shown in the page using the text binding avoiding any innerHTML injection. //res = method that returns an error msg string for a given key. uiErrors([res("GenericErrorMessage")]); } </code></pre> <p><strong>jsonResult</strong> is the response of an ajax call and it has the following structure:</p> <pre><code>{ "errors": [ {"Key": "OrderNotFound", "Value": "Your order could not be found."} ] } </code></pre> <p>Where both the <strong>Key</strong> and <strong>Value</strong> are not created using any user input. They are const strings in server code.</p> <h1>Adding AppScan Output</h1> <p>[1 of 1] DOM Based Cross-Site Scripting</p> <p>Severity: High</p> <p>Test Type: Application</p> <p>Vulnerable URL: <a href="https://www.domain.com/scripts/checkout.js" rel="nofollow">https://www.domain.com/scripts/checkout.js</a></p> <p>CVE ID(s): N/A</p> <p>CWE ID(s): 79</p> <p>Remediation Tasks: Analyze client side code and sanitize its input sources</p> <p>Variant 1 of 1 [ID=1612185601]</p> <p>Request/Response:</p> <p><a href="https://www.domain.com/scripts/checkout.js" rel="nofollow">https://www.domain.com/scripts/checkout.js</a>? v=m9is46e_hmcr4gnmuj4o6xssdozcytmn9flbuxtvbmy1:</p> <p>1 : i !== null &amp;&amp; i.errors ? (i.errors[0].Key === "OrderNotFound" || i.errors[0].Key === "ShoppingCartModified") &amp;&amp; (alert(i.errors[0].Value), window.location.href = window.location.href.split("#")[0]) : t([s ("GenericErrorMessage")])</p> <p>Validation In Response:</p> <p>N/A</p> <p>Reasoning:</p> <p>N/A</p> <p>CWE ID:</p> <p>79</p>
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    1. CODid AppScan provide details of exploit?
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    2. CO@YuriyGalanter added the AppScan details.
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