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TITLE:
TFTP Server TFTPDWIN Long Message Denial of Service

SECUNIA ADVISORY ID:
SA24452

VERIFY ADVISORY:
http://secunia.com/advisories/24452/

CRITICAL:
Less critical

IMPACT:
DoS

WHERE:
>From local network

SOFTWARE:
TFTP Server TFTPDWIN 0.x
http://secunia.com/product/11921/

DESCRIPTION:
Umesh Wanve has discovered a vulnerability in TFTP Server TFTPDWIN,
which can be exploited by malicious people to cause a DoS (Denial of
Service).

The vulnerability is caused due to the way the server handles overly
long messages (error code 10040) when using the "recv_from()" call.
This can be exploited to cause the service to terminate via an overly
long (more than 516 bytes) datagram sent to the TFTP service (default
port 69/UDP).

The vulnerability is confirmed in version 0.4.2. Other versions may
also be affected.

SOLUTION:
Use in a trusted network environment only.

PROVIDED AND/OR DISCOVERED BY:
Umesh Wanve

ORIGINAL ADVISORY:
http://www.milw0rm.com/exploits/3432

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