Netkit FTP Server: Denial of Service

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200801-17 / netkit-ftpd
Release Date	January 29, 2008
Latest Revision	January 29, 2008: 01
Impact	normal
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
net-ftp/netkit-ftpd	< 0.17-r7	>= 0.17-r7	All supported architectures

Related bugreports: #199206

Synopsis

Netkit FTP Server contains a Denial of Service vulnerability.

2. Impact Information

Background

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

Description

Venustech AD-LAB discovered that an FTP client connected to a vulnerable server with passive mode and SSL support can trigger an fclose() function call on an uninitialized stream in ftpd.c.

Impact

A remote attacker can send specially crafted FTP data to a server with passive mode and SSL support, causing the ftpd daemon to crash.

3. Resolution Information

Workaround

Disable passive mode or SSL.

Resolution

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

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=net-ftp/netkit-ftpd-0.17-r7"

4. References

CVE-2007-6263

Updated January 29, 2008

Summary: This is a Gentoo Linux Security Advisory

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