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bug#49260: Vulnerability Report [Misconfigured DMARC Record Flag]

From: Gary
Subject: bug#49260: Vulnerability Report [Misconfigured DMARC Record Flag]
Date: Tue, 13 Jul 2021 16:22:49 -0700

The mailing list server not implementing strict SPF & DKIM is a choice and not necessarily a security risk as dire as you seem to indicate — and may actually cause more problems than it fixes. The server in question is definitely not an open relay. I am a participant on a list, however, and not a sysadmin, so continuing to spam mailing lists on this subject matter instead of tracking down a sysadmin is more annoying than it is helpful.

On Tue, Jul 13, 2021 at 11:46 AM Cyber Zeus <cyberzeus111@gmail.com> wrote:
Hi team
Kindly update me with the bug that I have reported.


On Mon, Jun 28, 2021 at 10:28 PM Cyber Zeus <cyberzeus111@gmail.com> wrote:
Hi Team,
I am an independent security researcher and I have found a bug in your website  
The details of it are as follows:-

Description: This report is about a misconfigured Dmarc/SPF record flag, which can be used for malicious purposes as it allows for fake mailing on behalf of respected organizations.

About the Issue:
As i have seen the DMARC record for 


which is:
DMARC Policy Not Enabled
DMARC Not Found

As u can see that you Weak SPF record, a valid record should be like:-

DMARC Policy Enabled
What's the issue:
An SPF/DMARC record is a type of Domain Name Service (DNS) record that identifies which mail servers are permitted to send an email on behalf of your domain. The purpose of an SPF/DMARC record is to prevent spammers from sending messages on the behalf of your organization.

Attack Scenario: An attacker will send phishing mail or anything malicious mail to the victim via mail: 


even if the victim is aware of a phishing attack, he will check the origin email which came from your genuine mail id 


so he will think that it is genuine mail and get trapped by the attacker.
The attack can be done using any PHP mailer tool like this:-

$to = "VICTIM@example.com";
$subject = "Password Change";
$txt = "Change your password by visiting here - [VIRUS LINK HERE]l";
$headers = "From: 



U can also check your Dmarc/ SPF record form: MXTOOLBOX

have a look at the GOOGLE article for a better understanding!


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