[ GLSA 200501-24 ] tnftp: Arbitrary file overwriting

[GLSA]

Gentoo Linux Security Advisory

Title: tnftp: Arbitrary file overwriting (GLSA 200501-24)
Severity: normal
Exploitable: remote
Date: January 14, 2005
Bug(s): #74704
ID: 200501-24

Synopsis

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

Background

tnftp is a NetBSD FTP client with several advanced features.

Affected Packages

Package: net-ftp/tnftp
Vulnerable: < 20050103
Unaffected: >= 20050103
Architectures: All supported architectures


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.

Workaround

There is no known workaround at this time.

Resolution

All tnftp users should upgrade to the latest version: