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

[GLSA]

Gentoo Linux Security Advisory

Title: telnet-bsd: Multiple buffer overflows (GLSA 200504-01)
Severity: normal
Exploitable: remote
Date: April 01, 2005
Bug(s): #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: net-misc/telnet-bsd
Vulnerable: < 1.0-r1
Unaffected: >= 1.0-r1
Architectures: 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: