Gentoo Linux Security Advisory GLSA 200611-05

                                        http://security.gentoo.org/

Severity: High
Title: Netkit FTP Server: Privilege escalation
Date: November 10, 2006
Bugs: #150292
ID: 200611-05

Synopsis

An incorrect seteuid() call could allow an FTP user to access some
files or directories that would normally be inaccessible.

Background

net-ftp/ftpd is the Linux Netkit FTP server with optional SSL support.

Affected packages

-------------------------------------------------------------------
 Package       /  Vulnerable  /                         Unaffected
-------------------------------------------------------------------

1 net-ftp/ftpd < 0.17-r4 >= 0.17-r4

Description

Paul Szabo reported that an incorrect seteuid() call after the chdir()
function can allow an attacker to access a normally forbidden
directory, in some very particular circumstances, for example when the
NFS-hosted targetted directory is not reachable by the client-side root
user. Additionally, some potentially exploitable unchecked setuid()
calls were also fixed.

Impact

A local attacker might craft his home directory to gain access through
ftpd to normally forbidden directories like /root, possibly with
writing permissions if seteuid() fails and if the ftpd configuration
allows that. The unchecked setuid() calls could also lead to a root FTP
login, depending on the FTP server configuration.

Workaround

There is no known workaround at this time.

Resolution

All Netkit FTP Server users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose ">=net-ftp/ftpd-0.17-r4"

References

[ 1 ] CVE-2006-5778
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-5778

Availability

This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

http://security.gentoo.org/glsa/glsa-200611-05.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
[email protected] or alternatively, you may file a bug at
http://bugs.gentoo.org.

License

Copyright 2006 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

http://creativecommons.org/licenses/by-sa/2.5