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

[GLSA]

Gentoo Linux Security Advisory

Title: Netkit FTP Server: Privilege escalation (GLSA 200611-05)
Severity: high
Exploitable: remote
Date: November 10, 2006
Updated: December 30, 2007
Bug(s): #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: net-ftp/netkit-ftpd
Vulnerable: < 0.17-r4
Unaffected: >= 0.17-r4
Architectures: 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: