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    <title>Windows X64 on </title>
    <link>https://n9o.xyz/tags/windows-x64/</link>
    <description>Recent content in Windows X64 on </description>
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    <copyright>© 2026 Vaishnav Baraskar</copyright>
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    <item>
      <title>Copy, Paste, Exploit: Buffer Overflow in EduGrade Import Engine</title>
      <link>https://n9o.xyz/reverseengineering/edugrade/</link>
      <pubDate>Wed, 18 Sep 2024 00:00:00 +0000</pubDate>
      
      <guid>https://n9o.xyz/reverseengineering/edugrade/</guid>
      <description>&lt;h2 class=&#34;relative group&#34;&gt;4. Buffer Overflow in EduGrade Import Engine (x64) 
    &lt;div id=&#34;4-buffer-overflow-in-edugrade-import-engine-x64&#34; class=&#34;anchor&#34;&gt;&lt;/div&gt;
    
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        class=&#34;absolute top-0 w-6 transition-opacity opacity-0 ltr:-left-6 rtl:-right-6 not-prose group-hover:opacity-100&#34;&gt;
        &lt;a class=&#34;group-hover:text-primary-300 dark:group-hover:text-neutral-700 !no-underline&#34; href=&#34;#4-buffer-overflow-in-edugrade-import-engine-x64&#34; aria-label=&#34;Anchor&#34;&gt;#&lt;/a&gt;
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&lt;/h2&gt;
&lt;p&gt;&lt;strong&gt;Platform:&lt;/strong&gt; Windows 10 x64&lt;br&gt;
&lt;strong&gt;Target:&lt;/strong&gt; EduGrade Desktop (Import Engine Parser)&lt;br&gt;
&lt;strong&gt;Discovered:&lt;/strong&gt; August 2024&lt;br&gt;
&lt;strong&gt;Status:&lt;/strong&gt; Local Privilege Escalation (unpatched)&lt;br&gt;
&lt;strong&gt;CVSS (Est.):&lt;/strong&gt; 7.6 – Local overflow leads to code execution&lt;/p&gt;</description>
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    <item>
      <title>Strings Unleashed: Unsafe Length Handling in BookPro Reader</title>
      <link>https://n9o.xyz/reverseengineering/bookpro/</link>
      <pubDate>Sat, 22 Jun 2024 00:00:00 +0000</pubDate>
      
      <guid>https://n9o.xyz/reverseengineering/bookpro/</guid>
      <description>&lt;h2 class=&#34;relative group&#34;&gt;3. Unsafe Length Handling in BookPro Reader (x64) 
    &lt;div id=&#34;3-unsafe-length-handling-in-bookpro-reader-x64&#34; class=&#34;anchor&#34;&gt;&lt;/div&gt;
    
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        class=&#34;absolute top-0 w-6 transition-opacity opacity-0 ltr:-left-6 rtl:-right-6 not-prose group-hover:opacity-100&#34;&gt;
        &lt;a class=&#34;group-hover:text-primary-300 dark:group-hover:text-neutral-700 !no-underline&#34; href=&#34;#3-unsafe-length-handling-in-bookpro-reader-x64&#34; aria-label=&#34;Anchor&#34;&gt;#&lt;/a&gt;
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&lt;/h2&gt;
&lt;p&gt;&lt;strong&gt;Platform:&lt;/strong&gt; Windows 10 x64&lt;br&gt;
&lt;strong&gt;Target:&lt;/strong&gt; BookPro Reader (EPUB/ZIP Parser)&lt;br&gt;
&lt;strong&gt;Discovered:&lt;/strong&gt; May 2024&lt;br&gt;
&lt;strong&gt;Status:&lt;/strong&gt; Unreported – no known disclosure policy&lt;br&gt;
&lt;strong&gt;CVSS (Est.):&lt;/strong&gt; 8.1 (High) – Stack corruption via overlong metadata entry&lt;/p&gt;</description>
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    <item>
      <title>Racing the Kernel: Use-After-Free in SnapBackup.sys</title>
      <link>https://n9o.xyz/reverseengineering/snapbackup/</link>
      <pubDate>Sat, 02 Dec 2023 00:00:00 +0000</pubDate>
      
      <guid>https://n9o.xyz/reverseengineering/snapbackup/</guid>
      <description>&lt;h1 class=&#34;relative group&#34;&gt;&lt;strong&gt;Prologue — Ring-0 and the Need for Speed&lt;/strong&gt; 
    &lt;div id=&#34;prologue--ring-0-and-the-need-for-speed&#34; class=&#34;anchor&#34;&gt;&lt;/div&gt;
    
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&lt;/h1&gt;
&lt;p&gt;Most people ignore backup software. I don’t. Especially when it’s running in the kernel and handling file operations with zero context verification.&lt;/p&gt;</description>
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    <item>
      <title>Stacking Bytes: Heap Overflow in PrintSecure’s Spooler</title>
      <link>https://n9o.xyz/reverseengineering/printsecure/</link>
      <pubDate>Mon, 06 Nov 2023 00:00:00 +0000</pubDate>
      
      <guid>https://n9o.xyz/reverseengineering/printsecure/</guid>
      <description>&lt;h1 class=&#34;relative group&#34;&gt;&lt;strong&gt;Prologue — Midnight Layers &amp;amp; Metadata Games&lt;/strong&gt; 
    &lt;div id=&#34;prologue--midnight-layers--metadata-games&#34; class=&#34;anchor&#34;&gt;&lt;/div&gt;
    
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        &lt;a class=&#34;group-hover:text-primary-300 dark:group-hover:text-neutral-700 !no-underline&#34; href=&#34;#prologue--midnight-layers--metadata-games&#34; aria-label=&#34;Anchor&#34;&gt;#&lt;/a&gt;
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&lt;/h1&gt;
&lt;p&gt;I’d been reverse engineering some internal RPC routines on a lightly documented print management service—&lt;strong&gt;PrintSecure&lt;/strong&gt;, used across several enterprise Windows Server 2019 deployments. The kind of service that hums quietly in the background, doing menial job routing, completely overlooked. That&amp;rsquo;s usually a good place to find something sharp.&lt;/p&gt;</description>
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    <item>
      <title>Overflowing Authority: Stack Smash in LocalAdminTool.exe</title>
      <link>https://n9o.xyz/reverseengineering/localadmintool/</link>
      <pubDate>Mon, 02 Oct 2023 00:00:00 +0000</pubDate>
      
      <guid>https://n9o.xyz/reverseengineering/localadmintool/</guid>
      <description>&lt;h1 class=&#34;relative group&#34;&gt;&lt;strong&gt;Prologue — Pipes, Stacks, and Hidden Elevation&lt;/strong&gt; 
    &lt;div id=&#34;prologue--pipes-stacks-and-hidden-elevation&#34; class=&#34;anchor&#34;&gt;&lt;/div&gt;
    
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&lt;/h1&gt;
&lt;p&gt;I was digging around Windows 10 utilities installed on a workstation used for internal admin scripting. One tool stood out — &lt;code&gt;LocalAdminTool.exe&lt;/code&gt;. It used a named pipe to receive commands, and the binary hadn’t seen a patch in years.&lt;/p&gt;</description>
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    <item>
      <title>Signed to Compromise: Kernel Overflow in XLogDriver.sys</title>
      <link>https://n9o.xyz/reverseengineering/xlogdriver/</link>
      <pubDate>Sat, 10 Jun 2023 00:00:00 +0000</pubDate>
      
      <guid>https://n9o.xyz/reverseengineering/xlogdriver/</guid>
      <description>&lt;h1 class=&#34;relative group&#34;&gt;Signed Driver Exploit in XLogDriver.sys (x64 Kernel) 
    &lt;div id=&#34;signed-driver-exploit-in-xlogdriversys-x64-kernel&#34; class=&#34;anchor&#34;&gt;&lt;/div&gt;
    
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        class=&#34;absolute top-0 w-6 transition-opacity opacity-0 ltr:-left-6 rtl:-right-6 not-prose group-hover:opacity-100&#34;&gt;
        &lt;a class=&#34;group-hover:text-primary-300 dark:group-hover:text-neutral-700 !no-underline&#34; href=&#34;#signed-driver-exploit-in-xlogdriversys-x64-kernel&#34; aria-label=&#34;Anchor&#34;&gt;#&lt;/a&gt;
    &lt;/span&gt;        
    
&lt;/h1&gt;

&lt;h2 class=&#34;relative group&#34;&gt;Prologue: A Signed Invitation to Ring-0 
    &lt;div id=&#34;prologue-a-signed-invitation-to-ring-0&#34; class=&#34;anchor&#34;&gt;&lt;/div&gt;
    
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        class=&#34;absolute top-0 w-6 transition-opacity opacity-0 ltr:-left-6 rtl:-right-6 not-prose group-hover:opacity-100&#34;&gt;
        &lt;a class=&#34;group-hover:text-primary-300 dark:group-hover:text-neutral-700 !no-underline&#34; href=&#34;#prologue-a-signed-invitation-to-ring-0&#34; aria-label=&#34;Anchor&#34;&gt;#&lt;/a&gt;
    &lt;/span&gt;        
    
&lt;/h2&gt;
&lt;p&gt;This one hit different. I was sifting through a bunch of random vendor drivers, most of them dusty utilities for things like USB logs and peripheral diagnostics. Nothing fancy. But one caught my eye: &lt;code&gt;XLogDriver.sys&lt;/code&gt;.&lt;/p&gt;</description>
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    <item>
      <title>Signed Once, Loaded Twice: Plugin Signature Bypass in CodeWorks IDE</title>
      <link>https://n9o.xyz/reverseengineering/codeworks/</link>
      <pubDate>Tue, 11 Apr 2023 00:00:00 +0000</pubDate>
      
      <guid>https://n9o.xyz/reverseengineering/codeworks/</guid>
      <description>&lt;h1 class=&#34;relative group&#34;&gt;Signature Bypass in CodeWorks IDE Plugin Loader 
    &lt;div id=&#34;signature-bypass-in-codeworks-ide-plugin-loader&#34; class=&#34;anchor&#34;&gt;&lt;/div&gt;
    
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        class=&#34;absolute top-0 w-6 transition-opacity opacity-0 ltr:-left-6 rtl:-right-6 not-prose group-hover:opacity-100&#34;&gt;
        &lt;a class=&#34;group-hover:text-primary-300 dark:group-hover:text-neutral-700 !no-underline&#34; href=&#34;#signature-bypass-in-codeworks-ide-plugin-loader&#34; aria-label=&#34;Anchor&#34;&gt;#&lt;/a&gt;
    &lt;/span&gt;        
    
&lt;/h1&gt;

&lt;h2 class=&#34;relative group&#34;&gt;Prologue: Not All Checks Are Made Equal 
    &lt;div id=&#34;prologue-not-all-checks-are-made-equal&#34; class=&#34;anchor&#34;&gt;&lt;/div&gt;
    
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        class=&#34;absolute top-0 w-6 transition-opacity opacity-0 ltr:-left-6 rtl:-right-6 not-prose group-hover:opacity-100&#34;&gt;
        &lt;a class=&#34;group-hover:text-primary-300 dark:group-hover:text-neutral-700 !no-underline&#34; href=&#34;#prologue-not-all-checks-are-made-equal&#34; aria-label=&#34;Anchor&#34;&gt;#&lt;/a&gt;
    &lt;/span&gt;        
    
&lt;/h2&gt;
&lt;p&gt;It started with curiosity, like it usually does. I wasn’t even targeting CodeWorks specifically. I was just bouncing around dev tools I had lying around — checking how they loaded plugins, how they validated them, and if they did anything&amp;hellip; out of order.&lt;/p&gt;</description>
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