GLSA 200504-01: telnet-bsd: Multiple buffer overflows

http://security.gentoo.org/

Severity:	normal
Title:	telnet-bsd: Multiple buffer overflows
Date:	04/01/2005
Bugs:	#87019
ID:	200504-01

Synopsis

The telnet-bsd telnet client is vulnerable to two buffer overflows, which could allow a malicious telnet server operator to execute arbitrary code.

Background

telnet-bsd provides a command line telnet client which is used for remote login using the telnet protocol.

Affected packages

Package	Vulnerable	Unaffected	Architecture(s)
net-misc/telnet-bsd	< 1.0-r1	>= 1.0-r1	All supported architectures

Description

A buffer overflow has been identified in the env_opt_add() function of telnet-bsd, where a response requiring excessive escaping can cause a heap-based buffer overflow. Another issue has been identified in the slc_add_reply() function, where a large number of SLC commands can overflow a fixed size buffer.

Impact

Successful exploitation 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 telnet-bsd users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=net-misc/telnet-bsd-1.0-r1"

References

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200504-01.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.