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telnet-bsd: Multiple buffer overflows


1.  Gentoo Linux Security Advisory

Version Information

Advisory Reference GLSA 200504-01 / telnet
Release Date April 01, 2005
Latest Revision April 01, 2005: 01
Impact normal
Exploitable remote
Package Vulnerable versions Unaffected versions Architecture(s)
net-misc/telnet-bsd < 1.0-r1 >= 1.0-r1 All supported architectures

Related bugreports: #87019


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

2.  Impact Information


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


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.


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.

3.  Resolution Information


There is no known workaround at this time.


All telnet-bsd users should upgrade to the latest version:

Code Listing 3.1: Resolution

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

4.  References


Page updated April 01, 2005

Summary: This is a Gentoo Linux Security Advisory

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