NULL pointer in SurgeFTP 2.3a2

2008.02.27
Risk: Medium
Local: No
Remote: Yes
CWE: CWE-119


CVSS Base Score: 6.4/10
Impact Subscore: 4.9/10
Exploitability Subscore: 10/10
Exploit range: Remote
Attack complexity: Low
Authentication: No required
Confidentiality impact: None
Integrity impact: Partial
Availability impact: Partial

####################################################################### 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 (at) autistici (dot) org [email concealed] 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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