full-disclosure - ALERT ALERT plaintext passwords in linux ALERT ALERT

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From: johnpf at atnet.net.au (John)
Subject: ALERT ALERT plaintext passwords in linux ALERT
 ALERT

This is extremely old. There was an exploit for Linux and Solaris that 
used this back in 1995 (or earlier). In that case the idea was to get a 
local user shell, then start looking at kcore. Then try to login as root 
and grep for the crypted passwd, then feed that string to Jack-the-Ripper.

That was when the permissions on kcore were changed so that you cant see 
all of kcore.

There was even a trojaned copy of Slackware floating about that emailed 
via an anonymiser the root passwd every time passwd was run by root that 
used this.

JPF


ppan@...hmail.com wrote:

>-----BEGIN PGP SIGNED MESSAGE-----
>Hash: SHA1
>
>
>Problem:  Linux stores your passwords in plaintext
>          See proof of concept exploit below
>
>Fix:      rm -rf /dev/kmem
>
>
>Demonstration:
>
>- ---flic---
>bash$ ./passcheck.sh secret
>checkpass v1.5
>Proves that kmem leakes your passwords
>Needs to be run as root
>By etah^etihw aka peter-pan
>
>Checking for password 'secret'
>Binary file /proc/kcore matches
>- -flac-
>
>OMG!!!! it matches!!!
>Please don't tell anyone my root password because
>I cant change it because i deleted the passwd program
>because i thougt that it is vulnerable but I
>think it was not vulnerable but i cant get it because
>I have to port undel.exe to lunix first.
>
>Here is the 0-DAY exploit!
>Please do not abuse!!!
>
>- ---click---
>#!/bin/bash
>
># POC exploit
># shows kmem is a fscking leaker!
>
>echo "checkpass v1.5";
>echo "proves that kmem leakes your passwords";
>echo "needs to be run as root";
>echo "by etah^etihw";
>echo "             ";
>
>echo "checking for password '$1'";
>grep $1 /proc/kcore
>- ---clack---
>
>(do not forget to make 'chmod +x passcheck.sh'!!)
>
>
>Greets:
>zisss (you are the man bro!!)
>drater (mad resopectz to yu0!!)
>verb (wuz up? your a.t. owns me ass!!)
>jchrist (your dad > *)
>
>regards
>Peter Pan
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