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TITLE:
FutureSoft TFTP Server 2000 Directory Traversal and Buffer Overflows

SECUNIA ADVISORY ID:
SA15539

VERIFY ADVISORY:
http://secunia.com/advisories/15539/

CRITICAL:
Moderately critical

IMPACT:
Exposure of system information, Exposure of sensitive information,
System access

WHERE:
>From local network

SOFTWARE:
TFTP Server 2000 1.x
http://secunia.com/product/5179/

DESCRIPTION:
Tan Chew Keong has reported some vulnerabilities in TFTP Server 2000,
which can be exploited by malicious people to gain knowledge of
sensitive information or compromise a vulnerable system.

1) Boundary errors within the handling of Read and Write requests can
be exploited to cause a stack-based buffer overflow via a request
containing an overly long filename or transfer-mode string.

Successful exploitation allows execution of arbitrary code with
SYSTEM privileges.

2) Missing input validation can be exploited to access arbitrary
files outside the TFTP root via directory traversal attacks.

The vulnerabilities have been reported in version 1.0.0.1. Other
versions may also be affected.

SOLUTION:
Use the product on isolated subnets with trusted users only.

PROVIDED AND/OR DISCOVERED BY:
Tan Chew Keong

ORIGINAL ADVISORY:
http://www.security.org.sg/vuln/tftp2000-1001.html

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About:
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