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TITLE:
NetTerm NetFtpd "USER" Command Buffer Overflow Vulnerability

SECUNIA ADVISORY ID:
SA15140

VERIFY ADVISORY:
http://secunia.com/advisories/15140/

CRITICAL:
Highly critical

IMPACT:
System access

WHERE:
>From local network

SOFTWARE:
NetTerm 4.x
http://secunia.com/product/1904/
NetTerm 5.x
http://secunia.com/product/4995/

DESCRIPTION:
Sergio Alvarez has reported a vulnerability in NetTerm, which can be
exploited by malicious people to compromise a vulnerable system.

The vulnerability is caused due to a boundary error in the NetFtpd
program and can be exploited to cause a buffer overflow by passing an
overly long argument to the "USER" FTP command when logging in.

Successful exploitation allows execution of arbitrary code.

An exploit is publicly available.

NOTE: This vulnerability has been rated as a "From local network"
issue, since the vendor recommends customers to only use the NetFtpd
program behind a firewall in a controlled environment and not as a
general purpose FTP server.

SOLUTION:
The vendor has removed NetFtpd in NetTerm 5.1.1.1 and later.

Don't use the NetFtpd program.

PROVIDED AND/OR DISCOVERED BY:
Sergio Alvarez

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