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Subject: Big Brother filename extension vulnerability
From: xternal (xternal1YAHOO.COM)
Date: Tue Jul 11 2000 - 18:11:39 CDT
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versions affected: bb14h2 (current) and older
bbd listens for incoming connections on port 1984.
Using telnet or the bb client, it is possible to
connect and create a filename with an arbitrary
extension, as the extension is not rigorously checked.
As this file is droped into a directory accessible
via the web server, any file extension that is parsed
server side can be abused. For example:
./bb 220.127.116.11 "status evil.php3 <?<system(\"cat
will allow viewing of the /etc/passwd upon browsing to
-Modify bbd.c to only allowed specified file
extensions(.disk, .proc ...)
-Implement access restrictions via
$BBHOME/etc/security to minimize exposure to
vulnerabilities. Unfortunately, the default install
doesn't enable the security file.
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