Date: Tue, 21 Jul 1998 12:09:42 +0200 From: Juergen Nickelsen <ni@tellique.de> To: Val <val@hcol.net> Cc: freebsd-questions@FreeBSD.ORG Subject: Re: Off topic - popper security Message-ID: <35B468E6.E27EA537@tellique.de> References: <Pine.BSF.3.96.980720155107.28050A-100000@ns.hcol.net>
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In <Pine.BSF.3.96.980720155107.28050A-100000@ns.hcol.net>, Val wrote:
> Today i got a call from a concerned individual who is alleging
> that trough the /usr/local/libexec/popper one can get into the system.
[...]
> Did anyone hear about this problem? What is the usual way for
> resolving these other than learning C and looking in the source code?
Reading the CERT advisories. I have attached the one about popper below;
it also contains information on how to get the CERT advisories. There
was also an advisory about imapd yesterday, BTW. And, yes, I already
have updated both popper and imapd. :-)
Greetings, Juergen.
--
Juergen Nickelsen <ni@tellique.de>
Tellique Kommunikationstechnik GmbH
Gustav-Meyer-Allee 25, 13355 Berlin, Germany
Tel. +49 30 46307-552 / Fax +49 30 46307-579
-----BEGIN PGP SIGNED MESSAGE-----
CERT* Advisory CA-98.08
Original issue date: July 14, 1998
Topic: Buffer overflows in some POP servers
-
-----------------------------------------------------------------------------
The CERT Coordination Center has received reports of buffer overflows
in some Post Office Protocol (POP) servers. For a list of vulnerable
versions and platforms, please refer to Appendix A. For help in
determining which version you are currently running, see Section III.A
below.
The CERT/CC team recommends that anyone running a vulnerable version of
this
software upgrade to the current vendor-recommended version. Until you
can do
so, we suggest disabling the POP server.
We will update this advisory as we receive additional information.
Please
check our advisory files regularly for updates that relate to your site.
-
-----------------------------------------------------------------------------
I. Description
The CERT Coordination Center has received reports of buffer overflow
vulnerabilities in some POP servers based on QUALCOMM's
qpopper. Qpopper is a Post Office Protocol (POP) server used for
downloading Internet e-mail.
Information about this vulnerability has been posted to various
mailing lists and newsgroups, and the CERT Coordination Center has
received reports of incidents in which this vulnerability has been
exploited to gain privileged access.
II. Impact
Remote users can gain privileged (root) access to systems running
vulnerable versions of POP servers.
III. Solution
If you determine that your POP server is vulnerable (Sec. A),
install a patch from your vendor. Until you can do so, we urge you
to
disable the POP server.
A. Determine if your version of the POP server is vulnerable.
To determine if a system is vulnerable, first telnet to port
110 on
that host. If it is running a POP server, the banner will show
the
version. For example:
% telnet yourmailhost.your.domain.com 110
Trying 123.123.123.123
Connected to mailhost
+OK QPOP (version 2.4) at yourmailhost.your.domain.com
starting
In the above example, the POP server is QUALCOMM's QPopper,
version 2.4, which is known to be a vulnerable version.
Check Appendix A to see if your vendor has identified other POP
server versions that are vulnerable. If you do not see your
vendor's
name, please contact the vendor directly.
B. Install a patch for this problem.
Appendix A contains input from vendors who have provided
information
for this advisory.
C. Workaround
If you are unable to upgrade to a version that is not
vulnerable,
we urge you to disable the POP server until you are able to
address
the problem. (This will, of course, mean that the functionality
provided by the POP server will not be available.)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Appendix A - Vendor Information
Below is a list of the vendors who have provided information for this
advisory. We will update this appendix as we receive additional
information.
If you do not see your vendor's name, the CERT/CC did not hear from that
vendor. Please contact the vendor directly.
Data General
- ------------
Data General does not ship qpopper, or any other POP client or server.
Fujitsu
- -------
The vulnerability described in this advisory is currently being
reviewed.
OpenBSD
- -------
OpenBSD does not ship qpopper.
QUALCOMM Incorporated
- ---------------------
Versions of QUALCOMM qpopper prior to 2.5 are vulnerable.
QUALCOMM recommends upgrading to the most recent version
(currently Version 2.52). Patches are available from
ftp://ftp.qualcomm.com/Eudora/servers/unix/popper
Further details, questions and comments should be sent to
<mailto:qpopper@qualcomm.com>.
Santa Cruz Operation, Inc.
- --------------------------
Some SCO Operating systems are vulnerable. Patches are currently
being developed and should be available soon.
-
-----------------------------------------------------------------------------
The CERT Coordination Center thanks Travis Mikalson at TerraNovaNet,
Inc., for reporting the vulnerability, and Laurence Lundblade at
QUALCOMM Incorporated for providing technical details and support in the
development of the advisory. We also acknowledge other members of the
Internet community who posted about this problem.
-
-----------------------------------------------------------------------------
If you believe that your system has been compromised, contact the CERT
Coordination Center or your representative in the Forum of Incident
Response
and Security Teams (see http://www.first.org/team-info/).
CERT/CC Contact Information
- ----------------------------
Email cert@cert.org
Phone +1 412-268-7090 (24-hour hotline)
CERT personnel answer 8:30-5:00 p.m. EST(GMT-5) /
EDT(GMT-4)
and are on call for emergencies during other hours.
Fax +1 412-268-6989
Postal address
CERT Coordination Center
Software Engineering Institute
Carnegie Mellon University
Pittsburgh PA 15213-3890
USA
Using encryption
We strongly urge you to encrypt sensitive information sent by email.
We can
support a shared DES key or PGP. Contact the CERT/CC for more
information.
Location of CERT PGP key
ftp://ftp.cert.org/pub/CERT_PGP.key
Getting security information
CERT publications and other security information are available from
http://www.cert.org/
ftp://ftp.cert.org/pub/
CERT advisories and bulletins are also posted on the USENET newsgroup
comp.security.announce
To be added to our mailing list for advisories and bulletins, send
email to
cert-advisory-request@cert.org
In the subject line, type
SUBSCRIBE your-email-address
-
---------------------------------------------------------------------------
Copyright 1998 Carnegie Mellon University. Conditions for use,
disclaimers,
and sponsorship information can be found in
http://www.cert.org/legal_stuff/legal_stuff.html and
ftp://ftp.cert.org/pub/legal_stuff .
If you do not have FTP or web access, send mail to cert@cert.org with
"copyright" in the subject line.
*CERT is registered in the U.S. Patent and Trademark Office.
-
---------------------------------------------------------------------------
This file: ftp://ftp.cert.org/pub/cert_advisories/CA-98.08.qpopper_vul
http://www.cert.org/nav/alerts.html
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Revision history
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