Bugtraq mailing list archives
NULL pointer in SurgeFTP 2.3a2
From: Luigi Auriemma <aluigi () autistici org>
Date: Mon, 25 Feb 2008 23:11:12 +0100
####################################################################### Luigi Auriemma Application: SurgeFTP http://www.netwinsite.com/surgeftp/ Versions: <= 2.3a2 Platforms: Windows, Linux and Solaris Bug: NULL pointer access Exploitation: remote Date: 25 Feb 2008 Author: Luigi Auriemma e-mail: aluigi () autistici org web: aluigi.org ####################################################################### 1) Introduction 2) Bug 3) The Code 4) Fix ####################################################################### =============== 1) Introduction =============== SurgeFTP is a commercial FTP server which supports also SSL/TLS and has a web interface for remote administration. ####################################################################### ====== 2) Bug ====== When a Content-Length parameter is received from the client, SurgeFTP tries to allocate the amount of memory (max 2147483647 bytes) specified in this field and then copies the data in the resulted new buffer. The problem is in the lack of checks on the result of the allocation which leads to the crash of the entire server during the copying of the data to a NULL pointer if that amount of memory cannot be allocated. ####################################################################### =========== 3) The Code =========== http://aluigi.org/poc/surgeftpizza.txt nc SERVER 7021 -v -v < surgeftpizza.txt ####################################################################### ====== 4) Fix ====== No fix ####################################################################### --- Luigi Auriemma http://aluigi.org
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- NULL pointer in SurgeFTP 2.3a2 Luigi Auriemma (Feb 25)