HexBrain

Nextcloud · Report #279717

Broken link for wrong domain entry may be leveraged for Phishing, Misinformation, Serving Malware

Validstatus
lowseverity
1upvotes
1 Mar 2020disclosed

How it was found

Hi Team,

Page: https://nextcloud.com/news/16/

Broken link for incorrect DNS entry: <a href="https://conf.nextcloud.comg/" imageanchor="1"><img border="0" src="https://raw.githubusercontent.com/nextcloud/promo/8dbb6978d22761589b012ec440d8ab11cc9bb46f/conference/conference-social-media-banner.png"></a>

It seems like a typo and makes the tld as .comg instead of .com.

Now other than usability issue for users, it poses security risk as .comg can be claimed as a gTLD since it is not a reserved TLD (Similar to https://isc.sans.edu/forums/diary/Stop+Using+internal+Top+Level+Domain+Names/21095/).

Also in certain cases malware or local network attacker may leverage it by serving .comg via their DNS server.

An attacker may misuse it in phishing scams or for spreading misinformation.

It shall either be removed or updated to avoid the risk associated.

A similar issue @ Twitter which you might find relevant and funny :) -https://www.theverge.com/2017/2/3/14495978/belgian-hacker-trump-twitter-links

Similar H1 report: https://hackerone.com/reports/265696

Please review.

Thanks!

This report was disclosed publicly on HackerOne and belongs to its author and the program. See the original