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TITLE:
XM Easy Personal FTP Server USER Command Vulnerability

SECUNIA ADVISORY ID:
SA19970

VERIFY ADVISORY:
http://secunia.com/advisories/19970/

CRITICAL:
Highly critical

IMPACT:
DoS, System access

WHERE:
>From remote

SOFTWARE:
XM Easy Personal FTP Server 4.x
http://secunia.com/product/9760/

DESCRIPTION:
Muhammad Ahmed Siddiqui has discovered a vulnerability in XM Easy
Personal FTP Server, which can be exploited by malicious people to
cause a DoS (Denial of Service) and potentially compromise a
vulnerable system.

The vulnerability is caused  due to a boundary error within the
handling of the USER command. This can be exploited to cause a
heap-based buffer overflow via overly long arguments passed to the
command.

Successful exploitation crashes the FTP server and may allow
arbitrary code execution.

The vulnerability has been confirmed in version 4.3. Prior versions
may also be affected.

SOLUTION:
Filter malicious requests in a proxy or firewall with FTP filtering
capabilities.

PROVIDED AND/OR DISCOVERED BY:
Muhammad Ahmed Siddiqui

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About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

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