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</svg>
</button>
<div>{{ message }}</div>
</div>
</div>
</template>
</div>
<include-fragment class="js-notification-shelf-include-fragment" data-base-src="https://github.com/notifications/beta/shelf"></include-fragment>
<div
class="application-main "
data-commit-hovercards-enabled
data-discussion-hovercards-enabled
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class="SelectMenu-input form-control"
aria-owns="ref-list-branches"
data-controls-ref-menu-id="ref-list-branches"
autofocus
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placeholder="Filter branches/tags"
type="text"
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data-targets="input-demux.sinks"
data-action="
input-entered:ref-selector#inputEntered
tab-selected:ref-selector#tabSelected
focus-list:ref-selector#focusFirstListMember
"
query-endpoint="/MOCSCTF/CTF-Write-UP/refs"
cache-key="v0:1603718772.0"
current-committish="bWFzdGVy"
default-branch="bWFzdGVy"
name-with-owner="TU9DU0NURi9DVEYtV3JpdGUtVVA="
prefetch-on-mouseover
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<div class="SelectMenu-message" data-index="{{ index }}">Could not load branches</div>
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</svg>
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<span>{{ refName }}</span>
<span>default</span>
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</ref-selector>
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<ref-selector
type="tag"
data-action="
input-entered:ref-selector#inputEntered
tab-selected:ref-selector#tabSelected
focus-list:ref-selector#focusFirstListMember
"
data-targets="input-demux.sinks"
query-endpoint="/MOCSCTF/CTF-Write-UP/refs"
cache-key="v0:1603718772.0"
current-committish="bWFzdGVy"
default-branch="bWFzdGVy"
name-with-owner="TU9DU0NURi9DVEYtV3JpdGUtVVA="
>
<template data-target="ref-selector.fetchFailedTemplate">
<div class="SelectMenu-message" data-index="{{ index }}">Could not load tags</div>
</template>
<template data-target="ref-selector.noMatchTemplate">
<div class="SelectMenu-message" data-index="{{ index }}">Nothing to show</div>
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<svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-check SelectMenu-icon SelectMenu-icon--check">
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<span>{{ refName }}</span>
<span>default</span>
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class="dropdown details-reset details-overlay"
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CSAW2020 - Widthness
Question:
Write up:
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README.MD
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data-tagsearch-url="/MOCSCTF/CTF-Write-UP/find-definition"
data-tagsearch-ref="master"
data-tagsearch-path="Web/CSAW2020-Widthness/README.MD"
data-tagsearch-lang="Markdown"
data-hydro-click="{"event_type":"code_navigation.click_on_symbol","payload":{"action":"click_on_symbol","repository_id":295290832,"ref":"master","language":"Markdown","originating_url":"https://github.com/MOCSCTF/CTF-Write-UP/tree/master/Web/CSAW2020-Widthness","user_id":null}}"
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<article class="markdown-body entry-content container-lg" itemprop="text"><h1><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M7.775 3.275a.75.75 0 001.06 1.06l1.25-1.25a2 2 0 112.83 2.83l-2.5 2.5a2 2 0 01-2.83 0 .75.75 0 00-1.06 1.06 3.5 3.5 0 004.95 0l2.5-2.5a3.5 3.5 0 00-4.95-4.95l-1.25 1.25zm-4.69 9.64a2 2 0 010-2.83l2.5-2.5a2 2 0 012.83 0 .75.75 0 001.06-1.06 3.5 3.5 0 00-4.95 0l-2.5 2.5a3.5 3.5 0 004.95 4.95l1.25-1.25a.75.75 0 00-1.06-1.06l-1.25 1.25a2 2 0 01-2.83 0z"></path></svg>CSAW2020 - Widthness</h1>
Write-Up Author: Teru Lei [MOCTF]
Flag:flag{gu3ss_u_f0und_m3}
Widthness
First browse the web page. We can observe that the web page is mixed with English and other language and the description of content is a bit weired… it seems that there is something hidden in the web content.
View source. We can see comment ‘zwsp is fun!’
By google what is zwsp, ZWSP means ‘zero-width space’.
And after google more. There is a good website for zwsp demo: https://offdev.net/demos/zwsp-steg-js
Let’s try to copy all of the web content by Ctrl-A->Ctrl-C to decode:
From the patten of result, it’s a base64 string, copy to online conversion website (e.g. base64decode.org) to decode:
It’s not a flag but obviously it’s a hint. And there is input field in web page. Try to copy the decoded output to webpage sign up text box, click ‘sign up’:
A path is shown. Add the path shown to the web path, use the base64 decoded output in previous steps as :
Seems it’s still another layer of zwsp. But after tried it did not work to just copy the webpage to zwsp demo webpage to decode. Next step let’s try to copy the source code by select ‘View Source’, and copy all content to zwsp decode:
The result output is a hex string. Copy thee hex string to online hex to ASCII conversion website (e.g. rapidtables.com) to convert:
With experience gained in previous steps, now we can try to copy the output to the text input field besides Sign Up again, then click Sign Up:
Another URL path show again, use the previous base64 decode output as pwd1 and hex to ASCII decode output as pwd2, we can get the flag finally:
</readme-toc>
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<svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-x">
<path fill-rule="evenodd" d="M3.72 3.72a.75.75 0 011.06 0L8 6.94l3.22-3.22a.75.75 0 111.06 1.06L9.06 8l3.22 3.22a.75.75 0 11-1.06 1.06L8 9.06l-3.22 3.22a.75.75 0 01-1.06-1.06L6.94 8 3.72 4.78a.75.75 0 010-1.06z"></path>
</svg>
</button>
You can’t perform that action at this time.
</div>
<div class="js-stale-session-flash flash flash-warn flash-banner" hidden
>
<svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-alert">
<path fill-rule="evenodd" d="M8.22 1.754a.25.25 0 00-.44 0L1.698 13.132a.25.25 0 00.22.368h12.164a.25.25 0 00.22-.368L8.22 1.754zm-1.763-.707c.659-1.234 2.427-1.234 3.086 0l6.082 11.378A1.75 1.75 0 0114.082 15H1.918a1.75 1.75 0 01-1.543-2.575L6.457 1.047zM9 11a1 1 0 11-2 0 1 1 0 012 0zm-.25-5.25a.75.75 0 00-1.5 0v2.5a.75.75 0 001.5 0v-2.5z"></path>
</svg>
<span>You signed in with another tab or window. Reload to refresh your session.</span>
<span>You signed out in another tab or window. Reload to refresh your session.</span>
</div>
<template id="site-details-dialog">
<details class="details-reset details-overlay details-overlay-dark lh-default color-fg-default hx_rsm" open>
<summary role="button" aria-label="Close dialog"></summary>
<details-dialog class="Box Box--overlay d-flex flex-column anim-fade-in fast hx_rsm-dialog hx_rsm-modal">
<button class="Box-btn-octicon m-0 btn-octicon position-absolute right-0 top-0" type="button" aria-label="Close dialog" data-close-dialog>
<svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-x">
<path fill-rule="evenodd" d="M3.72 3.72a.75.75 0 011.06 0L8 6.94l3.22-3.22a.75.75 0 111.06 1.06L9.06 8l3.22 3.22a.75.75 0 11-1.06 1.06L8 9.06l-3.22 3.22a.75.75 0 01-1.06-1.06L6.94 8 3.72 4.78a.75.75 0 010-1.06z"></path>
</svg>
</button>
<div class="octocat-spinner my-6 js-details-dialog-spinner"></div>
</details-dialog>
</details>
</template>
<div class="Popover js-hovercard-content position-absolute" style="display: none; outline: none;" tabindex="0">
<div class="Popover-message Popover-message--bottom-left Popover-message--large Box color-shadow-large" style="width:360px;">
</div>
</div>
<template id="snippet-clipboard-copy-button">
<div class="zeroclipboard-container position-absolute right-0 top-0">
<clipboard-copy aria-label="Copy" class="ClipboardButton btn js-clipboard-copy m-2 p-0 tooltipped-no-delay" data-copy-feedback="Copied!" data-tooltip-direction="w">
<svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-copy js-clipboard-copy-icon m-2">
<path fill-rule="evenodd" d="M0 6.75C0 5.784.784 5 1.75 5h1.5a.75.75 0 010 1.5h-1.5a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-1.5a.75.75 0 011.5 0v1.5A1.75 1.75 0 019.25 16h-7.5A1.75 1.75 0 010 14.25v-7.5z"></path><path fill-rule="evenodd" d="M5 1.75C5 .784 5.784 0 6.75 0h7.5C15.216 0 16 .784 16 1.75v7.5A1.75 1.75 0 0114.25 11h-7.5A1.75 1.75 0 015 9.25v-7.5zm1.75-.25a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-7.5a.25.25 0 00-.25-.25h-7.5z"></path>
</svg>
<svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-check js-clipboard-check-icon color-text-success d-none m-2">
<path fill-rule="evenodd" d="M13.78 4.22a.75.75 0 010 1.06l-7.25 7.25a.75.75 0 01-1.06 0L2.22 9.28a.75.75 0 011.06-1.06L6 10.94l6.72-6.72a.75.75 0 011.06 0z"></path>
</svg>
</clipboard-copy>
</div>
</template>
</body>
</html>
