Easy Message Board Directory Traversal and Remote Command

[SoulBlack Group]

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=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

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=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
Title: Easy Message Board Directory Traversal and Remote Command Execution
Vulnerability discovery: SoulBlack - Security Research -
http://soulblack.com.ar
Date: 08/05/2005
Severity: High. Remote Users Can Execute Arbitrary Code.
Affected version: Easy Message Board
Vendor: http://www.geocentral.net/colscripts/index.html
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=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

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=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

* Summary *

Easy Message Board is "Easy Message Board"

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* Technical Description *


A new vulnerability was identified in Easy Message Board, which may be
exploited by attackers to compromise a vulnerable web server. This
flaw is due to an input validation error in the "easymsgb.pl" script
where the variable print that is put under "open()", does not have a
control of data, which may be exploited by a remote attacker to
execute arbitrary commands with the privileges of the web server.

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* Example *

http://SITE/cgi-bin/emsgb/easymsgb.pl?print=3D../../../../../../../../etc/p=
asswd
http://SITE/cgi-bin/emsgb/easymsgb.pl?print=3D|id|

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* Fix *

Contact the Vendor.

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* References *

http://www.soulblack.com.ar/repo/papers/easymsgb_advisory.txt=20

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* Credits *

Vulnerability reported by SoulBlack Security Research

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=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3 D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
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SoulBlack - Security Research
http://www.soulblack.com.ar