[Full-disclosure] [ GLSA 200611-05 ] Netkit FTP Server: Privilege escalation

2006-11-10T00:00:00
ID SECURITYVULNS:DOC:14994
Type securityvulns
Reporter Securityvulns
Modified 2006-11-10T00:00:00

Description


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 &quot;&gt;=net-ftp/ftpd-0.17-r4&quot;

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 security@gentoo.org 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