netkit-telnetd: Buffer overflow

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200503-36 / netkit-telnetd
Release Date	March 31, 2005
Latest Revision	March 31, 2005: 01
Impact	normal
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
net-misc/netkit-telnetd	< 0.17-r6	>= 0.17-r6	All supported architectures

Related bugreports: #87211

Synopsis

The netkit-telnetd telnet client is vulnerable to a buffer overflow, which could allow a malicious telnet server operator to execute arbitrary code.

2. Impact Information

Background

netkit-telnetd provides standard Linux telnet client and server.

Description

A buffer overflow has been identified in the slc_add_reply() function of netkit-telnetd client, where a large number of SLC commands can overflow a fixed size buffer.

Impact

Successful explotation would require a vulnerable user to connect to an attacker-controlled host using telnet, potentially executing arbitrary code with the permissions of the telnet user.

3. Resolution Information

Workaround

There is no known workaround at this time.

Resolution

All netkit-telnetd users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=net-misc/netkit-telnetd-0.17-r6"

4. References

Updated March 31, 2005

Summary: This is a Gentoo Linux Security Advisory

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