[Full-Disclosure] ALERT ALERT plaintext passwords in linux ALERT ALERT

[John]

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 at hushmail.com wrote:

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>Hash: SHA1
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>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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