full-disclosure

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

From: sith at sithender.com (sith@...hender.com)
Subject: leaking

On Wed, May 12, 2004 at 10:16:23AM -0500, Alerta Redsegura wrote:
> I am really curious to know how you can collect e-mail addresses from a
> plain image fed from a website shown on an e-mail.
> 
> IP, yes.  User-agent, yes.  But e-mail addresses???

You don't _collect_ email addresses (they obviously already have it if they
are sending you email with it, ;)  But you can verify email addresses with
it.

The easiest would be to put a hash or some other identifier of the users
email address in the url for the image, then have mod_rewrite rewrite the
url (or not, who cares... you just wanted to verify the email address was
good) to an actual image on your system, and log the embeded info and
compare to your known addresses.

Aaron Peterson