Skip to main content

Email Injection

There are a lot of ways to send anonymous emails, some use it to mass mail, some use it to spoof identity, and some (a few) use it to send email anonymously. Usually a web mailform using the mail() function generates emails containing headers with the originating IP of the server it's running on. Therefore the mailform acts as a SMTP proxy. The input fields of the form may vary, but it is common to specify a mailform that gives you control over the subject, the message, and the sender's email address.

Function usage : mail([RECIPIENT],[SUBJECT],[MESSAGE],[EXTRAHEADERS],[EXTRAPARAMS]);


In this context, the target is to be able to send anonymous emails to other recipients. There are numerous additional fields that can be specified in the mail headers (see [ RFC 822 ]). For example 'Cc' (Carbon Copy), which sends a copy of the message to the email addresses given as arguments. A better choice is to use the 'Bcc' (Blind Carbon Copy) which sends a carbon copy of the message just like with the 'Cc' header, except that the recipiends email addresses given as arguments are not shown to the multiple recipients' headers. As specified in the [ RFC 822 ], one must add a line feed for every header. The <LF> (line feed) char has a hexadecimal value of 0x0A.

Thus by providing the following values to the example script of this article : -
Sender : <blocquote> "sender@anonymous.www%0ACc:recipient@someothersite.xxx%0ABcc:somebloke@grrrr.xxx,someotherbloke@oooops.xxx" </blocquote>
"ahem" </blocquote> - Message : <blocquote> "My Message..."
</blocquote>

Now The Raw email data will look like
To: recipient@victim.xxx
Subject: ahem
From: sender@anonymous.xxx
Cc:recipient@someothersite.xxx
Bcc:somebloke@grrrr.xxx,someotherbloke@oooops.xxx
My Message...



Let's keep the same value for subject and message, and give the following value to the sender : email@anonymous.xxx%0ATo:email1@who.xxx
the mail output is :
To: recipient@victim.xxx
Subject: Hum
From: email@anonymous.xxx
To:email1@who.xxx
My Message...


Repeating the 'To' header won't be a problem, the mail will be sent to recipient@victim.xxx AND email1@who.xxx.

Comments

Popular posts from this blog

Hacking Windows 10 UWP App: DLL Injection & common Vulnerabilities

I recently started working on  widows 10 Apps( Apps not Applications) security. Before diving deep in hacking terms lets try to understand what's new in Windows 10 UWP( Universal Platform) as compared to old Apps. Lets begin with how apps actually work on windows 10(desktop/tablet). Now windows 10 comes with a container only for running apps inside the isolated environment. By default, /APPCONTAINER(Linker Flag) is off. This option modifies an executable to indicate whether the app must be run in the appcontainer process-isolation environment. Specify /APPCONTAINER for an app that must run in the appcontainer environment—for example, a Windows Store app. (The option is set automatically in Visual Studio when you create a Windows Store app from a template.) For a desktop app, specify /APPCONTAINER:NO or just omit the option. The /APPCONTAINER option was introduced in Windows 8. Now there is no registry entry concept for these app in the System HIVE rather they install they own hiv...

Installing vmware-11.0 on Ubuntu 15.04 Using kernel Patch

curl http://pastie.org/pastes/9934018/download -o /tmp/vmnet-3.19.patch cd /usr/lib/vmware/modules/source tar -xf vmnet.tar patch -p0 -i /tmp/vmnet-3.19.patch tar -cf vmnet.tar vmnet-only rm -r *-only vmware-modconfig --console --install-all References: http://askubuntu.com/questions/605530/vmware-player-7-1-0-on-ubuntu-15-04-kernel-3-19-0-10-generic-app-loading http://askubuntu.com/questions/617704/failed-to-build-vmnet-for-kernel-3-19

SSI Injection Attack

SSIs are directives present on Web applications used to feed an HTML page with dynamic contents. They are similar to CGIs, except that SSIs are used to execute some actions before the current page is loaded or while the page is being visualized. In order to do so, the web server analyzes SSI before supplying the page to the user. The Server-Side Includes attack allows the exploitation of a web application by injecting scripts in HTML pages or executing arbitrary codes remotely. It can be exploited through manipulation of SSI in use in the application or force its use through user input fields. It is possible to check if the application is properly validating input fields data by inserting characters that are used in SSI directives, like:  Code: < ! # = / . " - > and [a-zA-Z0-9] Another way to discover if the application is vulnerable is to verify the presence of pages with extension .stm, .shtm and .shtml. However, the lack of these type of pages does not mean that th...