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[sec-adv] WS_FTP Server FTP Command Buffer Overflow Vulnerability

From: Secunia Security Advisories (sec-advsecunia.com)
Date: Thu Sep 04 2003 - 09:23:05 CDT

TITLE:
WS_FTP Server FTP Command Buffer Overflow Vulnerability

SECUNIA ADVISORY ID:
SA9671

VERIFY ADVISORY:
http://www.secunia.com/advisories/9671/

CRITICAL:
Highly critical

IMPACT:
System access

WHERE:
From remote

SOFTWARE:
WS_FTP Server 4.x
WS_FTP Server 3.x

DESCRIPTION:
A vulnerability has been reported in WS_FTP Server, which can be
exploited by malicious users to compromise a vulnerable system.

The vulnerability is caused due to a boundary error when handling
user input to the FTP commands "APPE" and "STAT". This can be
exploited by supplying a specially crafted argument longer than 255
bytes, which causes a buffer overflow.

Successful exploitation allows execution of arbitrary code with the
privileges of the FTP server but requires that the malicious person
has been authenticated by the FTP server.

The vulnerability was reported in version 3.4 and has been confirmed
in version 4.01. However, other versions may also be affected.

NOTE: A related vulnerability was reported in 2001 in version 2.0.3
but fixed in version 2.0.4.

SOLUTION:
Allow only trusted users to access the FTP server.
Filter malicious input in a FTP proxy.
Use another product.

REPORTED BY / CREDITS:
pejman

CHANGELOG:

ORIGINAL ADVISORY:

OTHER REFERENCES:

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