mit-krb5: Multiple buffer overflows in telnet client
Gentoo Linux Security Advisory
||GLSA 200504-04 / telnet
||April 06, 2005
||April 06, 2005: 01
All supported architectures
The mit-krb5 telnet client is vulnerable to two buffer overflows, which
could allow a malicious telnet server operator to execute arbitrary code.
The MIT Kerberos 5 implementation provides a command line telnet
client which is used for remote login via the telnet protocol.
A buffer overflow has been identified in the env_opt_add()
function, 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 telnet host, potentially executing arbitrary
code with the permissions of the telnet user on the client.
There is no known workaround at this time.
All mit-krb5 users should upgrade to the latest version:
Code Listing 3.1: Resolution
# emerge --sync
# emerge --ask --oneshot --verbose ">=app-crypt/mit-krb5-1.3.6-r2"