telnet-bsd: Multiple buffer overflows
Gentoo Linux Security Advisory
||GLSA 200504-01 / telnet
||April 01, 2005
||April 01, 2005: 01
All supported architectures
The telnet-bsd telnet client is vulnerable to two buffer overflows, which
could allow a malicious telnet server operator to execute arbitrary code.
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.
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"