GLSA 200611-05: Netkit FTP Server: Privilege escalation

http://security.gentoo.org/

Severity:	high
Title:	Netkit FTP Server: Privilege escalation
Date:	11/10/2006
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/netkit-ftpd is the Linux Netkit FTP server with optional SSL support.

Affected packages

Package	Vulnerable	Unaffected	Architecture(s)
net-ftp/netkit-ftpd	< 0.17-r4	>= 0.17-r4	All supported architectures

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/netkit-ftpd-0.17-r4"

References

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 https://bugs.gentoo.org.