tnftp: Arbitrary file overwriting

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200501-24 / tnftp
Release Date	January 14, 2005
Latest Revision	January 14, 2005: 01
Impact	normal
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
net-ftp/tnftp	< 20050103	>= 20050103	All supported architectures

Related bugreports: #74704

Synopsis

tnftp fails to validate filenames when downloading files, making it vulnerable to arbitrary file overwriting.

2. Impact Information

Background

tnftp is a NetBSD FTP client with several advanced features.

Description

The 'mget' function in cmds.c lacks validation of the filenames that are supplied by the server.

Impact

An attacker running an FTP server could supply clients with malicious filenames, potentially allowing the overwriting of arbitrary files with the permission of the connected user.

3. Resolution Information

Workaround

There is no known workaround at this time.

Resolution

All tnftp users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=net-ftp/tnftp-20050103"

4. References

Updated January 14, 2005

Summary: This is a Gentoo Linux Security Advisory

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