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Prior to this update, the in.telnetd service used the sockaddr structure to store IPv6 addresses. This structure was too small in its size, and as a result, subsequent logins wrote incorrect records about the last login source. With this update, in.telnetd now uses the sockaddr_storage structure, which is large enough in its size to be able to store IPv6 addresses.
Description of problem:
The sockaddr structure in telnetd.c main() is too small to hold an IPV6 address when converted to string form. This corrupt value is then transferred to utmp to create a permanent bad record.
Version-Release number of selected component (if applicable):
telnet-server-0.17-46.el6
How reproducible:
Always.
Steps to Reproduce:
1. telnet to IPV6 machine with no DNS record for IP
2. echo $REMOTEHOST
3.
Actual results:
$ telnet fd00:6969:6969:6969::91
Trying fd00:6969:6969:6969::91...
Connected to fd00:6969:6969:6969::91.
Escape character is '^]'.
login: test
Password:
Last login: Thu Feb 17 15:26:32 from fd00:6969:6969:6969:37:a6f5:e045:84bf%15237108
[test@host-91 ~]$ echo $REMOTEHOST
fd00:6969:6969:6969:82:59c7:70af:9dbf%6078452
Expected results:
$ telnet fd00:6969:6969:6969::91
Trying fd00:6969:6969:6969::91...
Connected to fd00:6969:6969:6969::91.
Escape character is '^]'.
login: test
Password:
Last login: Thu Feb 17 15:28:54 from fd00:6969:6969:6969:82:59c7:70af:9dbf%6078452
[test@host-91 ~]$ echo $REMOTEHOST
fd00:6969:6969:6969::12
Additional info:
Comment 2RHEL Program Management
2011-02-17 15:57:55 UTC
This request was evaluated by Red Hat Product Management for
inclusion in the current release of Red Hat Enterprise Linux.
Because the affected component is not scheduled to be updated
in the current release, Red Hat is unfortunately unable to
address this request at this time. Red Hat invites you to
ask your support representative to propose this request, if
appropriate and relevant, in the next release of Red Hat
Enterprise Linux. If you would like it considered as an
exception in the current release, please ask your support
representative.
Technical note added. If any revisions are required, please edit the "Technical Notes" field
accordingly. All revisions will be proofread by the Engineering Content Services team.
New Contents:
Prior to this update, the in.telnetd service used the sockaddr structure to store IPv6 addresses. This structure was too small in its size, and as a result, subsequent logins wrote incorrect records about the last login source. With this update, in.telnetd now uses the sockaddr_storage structure, which is large enough in its size to be able to store IPv6 addresses.
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.
http://rhn.redhat.com/errata/RHBA-2011-0963.html