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MyBB Visual Editor 1.8.18 Cross Site Scripting

MyBB Visual Editor 1.8.18 Cross Site Scripting
Posted Sep 22, 2018
Authored by Numan OZDEMIR

MyBB Visual Editor versions 1.8.18 and below suffer from a cross site scripting vulnerability.

tags | exploit, xss
advisories | CVE-2018-17128
MD5 | 893adb3c1017a595010aefc716d0483e

MyBB Visual Editor 1.8.18 Cross Site Scripting

Change Mirror Download
[+] Title: MyBB Visual Editor Stored XSS <= v1.8.18
[+] Author: Numan OZDEMIR
[+] Vendor Homepage: mybb.com
[+] Software Link: https://mybb.com/download/
[+] Version: Up to v1.8.18. Fixed in v1.8.19.
[+] PoC Video: https://numanozdemir.com/mybb/xss.mp4
[+] CVE: CVE-2018-17128
[+] Discovered by Numan OZDEMIR in InfinitumIT Labs
[+] root@numanozdemir.com - info@infinitumit.com.tr

[~] Description:

Attacker can run JavaScript codes in victim user's browser while victim
is replying a post.
'videotype' section causes this.

[~] How to Reproduce:

1)- Enter to thread posting page. (newthread.php, enter title and
content.)
2)- Click "insert a video" command. Select any source and insert any
URL.
3)- Edit the video source with your payload.
Or, directly add this code:
[video=PAYLOAD]http://victim.com[/video]
Example:
[video=PA<svg/onload=alert('xss')>YLOAD]http://victim.com[/video]

4)- Post the thread.

While victim user replying your post, his browser will run JavaScript.
Vulnerable pages:
editpost.php
newreply.php
private.php
and all Visual Editor embedded pages.

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