TITLE:
Sami FTP Server USER Command Buffer Overflow

SECUNIA ADVISORY ID:
SA18574

VERIFY ADVISORY:
http://secunia.com/advisories/18574/

CRITICAL:
Highly critical

IMPACT:
System access

WHERE:
>From remote

SOFTWARE:
Sami FTP Server 2.x
http://secunia.com/product/6956/

DESCRIPTION:
Critical Security has discovered a vulnerability in Sami FTP Server,
which can be exploited by malicious people to compromise a vulnerable
system.

The vulnerability is caused due to a boundary error in the handling
of the USER command. This can be exploited to cause a stack-based
buffer overflow and allows arbitrary code execution via an overly
long username.

Successful exploitation requires that the user clicks on the "Log"
tab to view the on-screen server log. However, this is not necessary
if the application is already running with the on-screen server log
displayed.

The vulnerability has been confirmed in version 2.0.1. Other versions
may also be affected.

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

PROVIDED AND/OR DISCOVERED BY:
Critical Security

ORIGINAL ADVISORY:
http://www.critical.lt/?vulnerabilities/208

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