GLSA 200503-36: netkit-telnetd: Buffer overflow

http://security.gentoo.org/

Severity:	normal
Title:	netkit-telnetd: Buffer overflow
Date:	03/31/2005
Bugs:	#87211
ID:	200503-36

Synopsis

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

Background

netkit-telnetd provides standard Linux telnet client and server.

Affected packages

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

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.

Workaround

There is no known workaround at this time.

Resolution

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

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

References

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200503-36.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.