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[SA13516] tnftp File Name Verification Vulnerability

From: Secunia Security Advisories (sec-advsecunia.com)
Date: Fri Dec 17 2004 - 11:52:36 CST

TITLE:
tnftp File Name Verification Vulnerability

SECUNIA ADVISORY ID:
SA13516

VERIFY ADVISORY:
http://secunia.com/advisories/13516/

CRITICAL:
Moderately critical

IMPACT:
Manipulation of data, System access

WHERE:
From remote

SOFTWARE:
tnftp
http://secunia.com/product/4396/

DESCRIPTION:
Yosef Klein has reported a vulnerability in tnftp, allowing malicious
people to overwrite local files.

The vulnerability is caused by lack of validation of file names
provided by the server in the "mget()" function. This can be
exploited to overwrite arbitrary files by sending a maliciously
crafted file name from the ftp server.

Successful exploitation allows overwriting local files, but requires
that a user connects to a malicious ftp server and downloads files.

The vulnerability has been reported in tnftp version 20030825
(FreeBSD port). Other versions and ports may also be vulnerable.

SOLUTION:
Use another product.

Do not download files from untrusted sites.

PROVIDED AND/OR DISCOVERED BY:
Yosef Klein

ORIGINAL ADVISORY:
http://tigger.uic.edu/~jlongs2/holes/tnftp.txt

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