4234781 1999-08-21 05:09 /140 rader/ Postmaster
Mottagare: Bugtraq (import) <7385>
Ärende: [RHSA-1999:029-01] Denial of service attack in in.telnetd
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Date: Thu, 19 Aug 1999 11:22:11 -0400
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From: Bill Nottingham <notting@REDHAT.COM>
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Red Hat, Inc. Security Advisory
Synopsis: Denial of service attack in in.telnetd
Advisory ID: RHSA-1999:029-01
Issue date: 1999-08-19
Updated on:
Keywords: telnet telnetd
Cross references:
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1. Topic:
A denial of service attack has been fixed in in.telnetd.
2. Bug IDs fixed (http://developer.redhat.com/bugzilla/):
4560
3. Relevant releases/architectures:
Red Hat Linux 4.2, 5.2, 6.0, all architectures
4. Obsoleted by:
5. Conflicts with:
6. RPMs required:
Red Hat Linux 4.2:
Intel:
ftp://ftp.redhat.com/redhat/updates/4.2/i386/NetKit-B-0.09-11.i386.rpm
Alpha:
ftp://ftp.redhat.com/redhat/updates/4.2/alpha/NetKit-B-0.09-11.alpha.rpm
Sparc:
ftp://ftp.redhat.com/redhat/updates/4.2/sparc/NetKit-B-0.09-11.sparc.rpm
Source packages:
ftp://ftp.redhat.com/redhat/updates/4.2/SRPMS/NetKit-B-0.09-11.src.rpm
Red Hat Linux 5.2:
Intel:
ftp://ftp.redhat.com/redhat/updates/5.2/i386/telnet-0.10-28.5.2.i386.rpm
Alpha:
ftp://ftp.redhat.com/redhat/updates/5.2/alpha/telnet-0.10-28.5.2.alpha.rpm
Sparc:
ftp://ftp.redhat.com/redhat/updates/5.2/sparc/telnet-0.10-28.5.2.sparc.rpm
Source packages:
ftp://ftp.redhat.com/redhat/updates/5.2/SRPMS/telnet-0.10-28.5.2.src.rpm
Red Hat Linux 6.0:
Intel:
ftp://ftp.redhat.com/redhat/updates/6.0/i386/telnet-0.10-29.i386.rpm
Alpha:
ftp://ftp.redhat.com/redhat/updates/6.0/alpha/telnet-0.10-29.alpha.rpm
Sparc:
ftp://ftp.redhat.com/redhat/updates/6.0/sparc/telnet-0.10-29.sparc.rpm
Source packages:
ftp://ftp.redhat.com/redhat/updates/6.0/SRPMS/telnet-0.10-29.src.rpm
7. Problem description:
in.telnetd attempts to negotiate a compatible terminal type
between the local and remote host. By setting the TERM
environment variable before connecting, a remote user could
cause the system telnetd to open files it should not. Depending
on the TERM setting used, this could lead to denial of service
attacks.
Thanks go to Michal Zalewski and the Linux Security Audit team
for noting this vulnerability.
8. Solution:
For each RPM for your particular architecture, run:
rpm -Uvh <filename>
where filename is the name of the RPM.
9. Verification:
MD5 sum Package Name
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0c425c34fb77a8309ff10b4143e9b847 i386/NetKit-B-0.09-11.i386.rpm
d791d645adeb5fa0147c1058b21cbbac alpha/NetKit-B-0.09-11.alpha.rpm
bfbd440845191bbdcf8be21ee59bf6a8 sparc/NetKit-B-0.09-11.sparc.rpm
ccd5ab53c423e468d66ca801c90b5ae4 SRPMS/NetKit-B-0.09-11.src.rpm
ef33f3c5ca810d05420e57b5cfcf8928 i386/telnet-0.10-28.5.2.i386.rpm
6dc23437a200193b0bfed23d5f5e6562 alpha/telnet-0.10-28.5.2.alpha.rpm
49c38457cc0a82a680fd9b9634dc8021 sparc/telnet-0.10-28.5.2.sparc.rpm
2f33670a683e3abef0e4914586c71961 SRPMS/telnet-0.10-28.5.2.src.rpm
4360d47490f13d60b8737d28dc88825a i386/telnet-0.10-29.i386.rpm
90213fcdca41a3ed12ab7d92344e7286 alpha/telnet-0.10-29.alpha.rpm
277787dbc39dff8ea84d4b16dcb7a954 sparc/telnet-0.10-29.sparc.rpm
269783a0754d234f7bef0f4717a8dbc2 SRPMS/telnet-0.10-29.src.rpm
These packages are PGP signed by Red Hat Inc. for security. Our key
is available at:
http://www.redhat.com/corp/contact.html
You can verify each package with the following command:
rpm --checksig <filename>
If you only wish to verify that each package has not been corrupted or
tampered with, examine only the md5sum with the following command:
rpm --checksig --nopgp <filename>
10. References:
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