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Bug 247 - telnetd segfaults with a given .telnetrc file
telnetd segfaults with a given .telnetrc file
Product: Red Hat Linux
Classification: Retired
Component: telnet (Show other bugs)
i386 Linux
medium Severity medium
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Assigned To: Florian La Roche
Depends On:
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Reported: 1998-12-01 07:06 EST by lionel.cons
Modified: 2008-05-01 11:37 EDT (History)
0 users

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Fixed In Version:
Doc Type: Bug Fix
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Clone Of:
Last Closed: 1999-04-06 19:46:19 EDT
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RHEL 7.3 requirements from Atomic Host:
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Description lionel.cons 1998-12-01 07:06:26 EST
On a machine with Red Hat Linux 5.1 for i386 and all
the updated RPMs, I see the following:

[mybox] ~ > cat .telnetrc
default environ undefine USER
default set flushoutput off
[mybox] ~ > telnet mybox
flushoutput character is 'off'.
Connected to mybox.
Escape character is '^]'.
Segmentation fault

/var/log/messages contains:
Dec  1 12:52:59 mybox telnetd[678]: ttloop:  read: Broken

It works fine when removing the ~/.telnetrc file.
It works also fine on other UNIXes including (but I'm not
100% sure) Red Hat Linux 4.1.
Comment 1 David Lawrence 1998-12-01 11:28:59 EST
This has been verified to be a bug. It occurs on systems later than
5.0. It only occurs if the first line is present. I comment it out and
the problem did not occur.
Comment 2 Jeff Johnson 1999-04-06 19:46:59 EDT
The segfault is actually in telnet, not telnetd.

Fixed (by scrapping the netkit telnet in favor of an OpenBSD client)
in telnet-0.10-24.

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