The mit-krb5 telnet client is vulnerable to two buffer overflows, which could allow a malicious telnet server operator to execute arbitrary code.
|Package||app-crypt/mit-krb5 on all architectures|
|Affected versions||< 1.3.6-r2|
|Unaffected versions||>= 1.3.6-r2|
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:
# emerge --sync # emerge --ask --oneshot --verbose ">=app-crypt/mit-krb5-1.3.6-r2"
April 06, 2005
April 06, 2005: 01