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TITLE:
TFTP Server MT Absolute Path Construction Buffer Overflow

SECUNIA ADVISORY ID:
SA21844

VERIFY ADVISORY:
http://secunia.com/advisories/21844/

CRITICAL:
Moderately critical

IMPACT:
DoS, System access

WHERE:
>From local network

SOFTWARE:
TFTP Server MT 1.x
http://secunia.com/product/11924/

DESCRIPTION:
n00b has discovered a vulnerability in TFTP Server MT, which
potentially can be exploited by malicious people to compromise a
vulnerable system.

The vulnerability is caused due to a boundary error when constructing
the absolute path to a requested resource. This can be exploited to
cause a heap-based buffer overflow by supplying an overly long string
(about 260 bytes) as a resource in a request.

Successful exploitation may allow execution of arbitrary code.

The vulnerability is confirmed in version 1.1. Other versions may
also be affected.

SOLUTION:
Restrict use of the TFTP service to trusted networks only.

PROVIDED AND/OR DISCOVERED BY:
n00b

ORIGINAL ADVISORY:
http://milw0rm.com/exploits/2334

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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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Definitions: (Criticality, Where etc.)
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