GLSA 200501-24: tnftp: Arbitrary file overwriting

http://security.gentoo.org/

Severity:	normal
Title:	tnftp: Arbitrary file overwriting
Date:	01/14/2005
Bugs:	#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	Vulnerable	Unaffected	Architecture(s)
net-ftp/tnftp	< 20050103	>= 20050103	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:

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

References

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200501-24.xml

Concerns?

Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.