Vulnerabilities in your site:
Mr Jerry
Hello Team,
I am a security researcher and I provide information and knowledge regarding “Vulnerability" on websites. I have found some vulnerabilities on your website/domain.
DESCRIPTION:
I just sent a forged email to my email address that appears to originate from den...@atsign.com I was able to do this because of the following :
DMARC record lookup and validation for atsign.com
“No DMARC Record found”
And/ OR
"DMARC Quarantine/Reject policy not enabled"
Fix:
1) Publish DMARC Record. (If not already Published)
2)Enable DMARC Quarantine/Reject policy
3)Your DMARC record should look like
"v=DMARC1; p=reject; sp=none; pct=100; ri=86400; rua=mailto:in...@domain.com"
And
As I have seen the SPF and TXT record for the atsign.com which is :
Found v=spf1 record for atsign.com:
v=spf1 include:_spf.google.com ~all
so valid record will look like :
Found v=spf1 record for atsign.com:
v=spf1 include:_spf.google.com -all
What's the issue :
What’s the issue: as u can see in the article difference between softfail and hardfail you should be using fail as Hardfail as it doesn’t allow anyone to send spoofed emails from your domains, In current SPF record you should replace (?) or
(~) with (-) at last before all , - is strict which prevents all spoofed emails except if you are sending
You can validate by testing yourself over here: mxtoolbox.com
This is useful in phishing, and this type of vulnerability is newsworthy (http://bits.blogs.nytimes.com/2015/04/09/sendgrid-email-breach-was-used-to-attack-coinbase-a-bitcoin-exchange/
https://medium.com/@hotbit/official-statement-notices-of-counterfeit-email-listing-hotbit-io-d1d240005d35
This can be done using any php mailer tool like this ,
<?php
$to = "VIC...@example.com";
$subject = "Password Change";
$txt = "Change your password by visiting here - [VIRUS LINK HERE]l";
$headers = "From: den...@atsign.com";
mail($to,$subject,$txt,$headers);
?>
IMPACT:
Due to this vulnerability, any hacker can send a forged email to your customers using your domain .Thus, getting sensitive information of your customers like login details, downloading a virus/malware etc.
Also When an attacker sends an email to your customers asking them to change their password. The customer, after seeing the mail, might consider the mail as legit and falls for the trap.
In doing this the attacker can take them to his website where certain JavaScript is executed which steals the customer's session id and password.
The results can be more dangerous and impactful.
A study shows why DMARC and SPF are crucial:
1) $1.6 million on average is what one single spear phishing attack costs for organizations
2) $500 million every year is scammed by phishing attacks
3) Just 3% of all users will report phishing emails to their management
4) More than 400 businesses are targeted by BEC scams every day
5) 76% of organizations have reported that they have been victims of a phishing attack.
6) 1 in 3 companies have been victims of CEO fraud emails
7) 70% of all global emails is malicious
8) Fake invoice messages are the #1 type of phishing lure
You can find the SPF fix over here : https://www.digitalocean.com/community/tutorials/how-to-use-an-spf-record-to-prevent-spoofing-improve-e-mail-reliability
For DMARC record : https://easydmarc.com/blog/how-to-fix-no-dmarc-record-found/
and DMARC policy here: https://support.rackspace.com/how-to/create-a-dmarc-policy/
Let me know if you need me to send a forged email.
Note: Eagerly awaiting your approval for the bounty reward tied to my recent security contribution. Your swift recognition not only celebrates collaboration but fuels our commitment to platform excellence. Let's continue the journey together!
Stay safe and healthy,
Mr. Jerry
Snapshot:
Mr Jerry
Is there any update on this bug?
I'm hoping to receive a bounty reward for responsible disclosure once your team has validated the issue.
I understand how busy your team must be. Take a few minutes of your precious time to update.
I will be waiting for your response.
Kind Regards.
Mr Jerry
How are you?
I haven't received any update from you yet.
Could you please confirm with me about the reported vulnerability and its bounty reward?
Looking forward to hearing from you soon.
Thanks and Regards,