XSS in Peerio 2 Windows Application (Write Up)

Howdy!


Few years ago I found a simple XSS vulnerability which affects a windows application of a company called Peerio. The application was similar to Slack nowadays which allows you to chat with your colleagues. The XSS was found in the chat input which if you will input an XSS payload on the chat box the payload will automatically trigger since they are using a web based application on it.

The vulnerability was reported directly to their security team and they added a quick fixed on it.

--Proof of Concept--

--Report Timeline--

Reported: Nov 21, 2017, 7:41 PM
First Response: Nov 23, 2017, 6:02 AM

Hi Evan,
thanks a lot, and quick catch — looks like this was introduced exactly one week ago.
What’s the best way to pay you? I’ll get the bureaucracy moving…
We should have a fix out tomorrow. 

 Fixed: Dec 2, 2017, 1:36 AM

Hi,
We pushed a direct fix in this release: https://github.com/PeerioTechnologies/peerio-desktop/releases/tag/v2.98.7
And then added strict CSP in the following release for a more global solution: https://github.com/PeerioTechnologies/peerio-desktop/releases/tag/v2.103.0 (you can check out pull requests #144 and #145 for details)
Thanks! 

Bounty: 1000 Canadian Dollar



I hope you enjoy this write up! stay tune for more contents like this in the future.

Have a great day,

Evan

“Life isn’t about finding yourself. Life is about creating yourself.”

– George Bernard Shaw

Data Tampering Issue in Spot.im Application (Write Up)

Howdy!


Early in November last year I found a vulnerability on a comment plugin of Spot.IM which affects their customers that uses their service. The vulnerability allows attacker to tamper data of the comment that can end up into impersonating other users. It can allow attacker to change the Text, Display Name and the Star ratings for the comment. The vulnerability was reported to Spot.IM and was rejected as for their reason it was related to phishing.

--Proof of Concept--

--Report Timeline--

Reported: Tue, Nov 26, 2019, 6:16 PM

Closed (Final Response): Fri, Dec 6, 2019, 3:21 AM

Hi Evan,
You are only modifying your own account data and it does not interfere with the data of others.
You will be unable to set a username if the username is already taken. You will be able to modify your display name, however display names are different from usernames.
Currently there are no privacy or authentication issues caused by this.
Kind Regards,
Spot.IM  

I hope you enjoy this write up! stay tune for more contents like this in the future.

Have a great day,

Evan

"Push yourself, because no one else is going to do it for you."

Popping Alerts in Mixmax Chrome Extension (Write Up)

Howdy!


Back in 2017, I reported this simple XSS vulnerability that affects Mixmax Chrome Extension. The vulnerability was due to a feature called insert link/URL. This vulnerability didn't trigger on other user since the payload was filtered after it was push to the victim so ends up into self-XSS but Mixmax issued a fix and rewarded me a Mixmax swag that until now didn't arrive. (I don't know why). This vulnerability was reported to Mixmax via Hackerone.


--Proof of Concept--

PS: Don't mind my inbox, nothing sensitive in there.

--Report Timeline--

Report Title: XSS in Mixmax Chrome Extension
Reported: 2017-10-31 13:00:48 +0000
Triaged: 2018-01-08 19:45:25 +0000

We'll fix, thanks!

Fixed: 2018-02-10 03:50:44 +0000
Reward: Mixmax Swag

I hope you enjoy this write up! stay tune for more contents like this in the future.

Have a great day,
Evan

“To be yourself in a world that is constantly trying to make you something else is the greatest accomplishment.”

― Ralph Waldo Emerson