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Category:   Application (Security)  >   Wireshark Vendors:   Wireshark.org
(Red Hat Issues Fix) Ethereal Network Sniffer Has Multiple Bugs That May Allow Remote Users to Send Packets to Execute Arbitrary Code or Cause the Sniffer to Hang or Crash
SecurityTracker Alert ID:  1004484
SecurityTracker URL:  http://securitytracker.com/id/1004484
CVE Reference:   CVE-2002-0012, CVE-2002-0013, CVE-2002-0353, CVE-2002-0401, CVE-2002-0402, CVE-2002-0403, CVE-2002-0404   (Links to External Site)
Date:  Jun 6 2002
Impact:   Denial of service via network, Execution of arbitrary code via network, Root access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 0.9.3 and prior
Description:   Several potential vulnerabilities have been reported in the Ethereal network sniffer. A remote user could cause the sniffer to crash or possibly execute arbitrary code.

According to the vendor, there are several bugs in Ethereal that could be exploited by remote users. A remote user could send a specially crafted packet over the network that Ethereal is monitoring to trigger these vulnerabilities. These security holes can also be triggered when a local user opens a malformed packet trace file.

The bugs are reported to exist in the following components:

- SMB dissector; a remote user could dereference a NULL pointer in two cases.
- X11 dissector; a remote user could trigger a buffer while parsing keysyms.
- DNS dissector; a remote user could create a malformed packet to cause this module to enter an infinite loop.
- GIOP dissector; a remote user could cause this module to allocate large amounts of memory.

Impact:   A remote user could cause Ethereal to hang or to crash or execute arbitrary code.
Solution:   The vendor has released a fix for Red Hat 7.2 and 7.3.

Red Hat Linux 7.2:

SRPMS:
ftp://updates.redhat.com/7.2/en/os/SRPMS/ethereal-0.9.4-0.7.2.0.src.rpm

i386:
ftp://updates.redhat.com/7.2/en/os/i386/ethereal-0.9.4-0.7.2.0.i386.rpm
ftp://updates.redhat.com/7.2/en/os/i386/ethereal-gnome-0.9.4-0.7.2.0.i386.rpm

ia64:
ftp://updates.redhat.com/7.2/en/os/ia64/ethereal-0.9.4-0.7.2.0.ia64.rpm
ftp://updates.redhat.com/7.2/en/os/ia64/ethereal-gnome-0.9.4-0.7.2.0.ia64.rpm

Red Hat Linux 7.3:

SRPMS:
ftp://updates.redhat.com/7.3/en/os/SRPMS/ethereal-0.9.4-0.7.3.0.src.rpm

i386:
ftp://updates.redhat.com/7.3/en/os/i386/ethereal-0.9.4-0.7.3.0.i386.rpm
ftp://updates.redhat.com/7.3/en/os/i386/ethereal-gnome-0.9.4-0.7.3.0.i386.rpm



The verification checksums are:

MD5 sum Package Name

8ab27ce7ccaec617b4e5bee0f6cafc8a 7.2/en/os/SRPMS/ethereal-0.9.4-0.7.2.0.src.rpm
a82a1bf914b31bc283c4786a6d005f5a 7.2/en/os/i386/ethereal-0.9.4-0.7.2.0.i386.rpm
95b0e675cc1be0b5d59a2b3becf2420c 7.2/en/os/i386/ethereal-gnome-0.9.4-0.7.2.0.i386.rpm
c370c2585040f9174ebe6b20def17764 7.2/en/os/ia64/ethereal-0.9.4-0.7.2.0.ia64.rpm
2096533a5f9352ff47b4fd01302b7c92 7.2/en/os/ia64/ethereal-gnome-0.9.4-0.7.2.0.ia64.rpm
70022f6df52ad74013ab2901fe6f0e3d 7.3/en/os/SRPMS/ethereal-0.9.4-0.7.3.0.src.rpm
52a3074dea1e4e9563558e523a659bc5 7.3/en/os/i386/ethereal-0.9.4-0.7.3.0.i386.rpm
1650416f14b9f6a7cb15aa2f38f20bf4 7.3/en/os/i386/ethereal-gnome-0.9.4-0.7.3.0.i386.rpm

See the Source Message for the vendor's advisory containing directions on how to apply the appropriate fix.

Vendor URL:  www.ethereal.com/appnotes/enpa-sa-00004.html (Links to External Site)
Cause:   Boundary error, State error
Underlying OS:  Linux (Red Hat Linux)
Underlying OS Comments:  7.2, 7.3

Message History:   This archive entry is a follow-up to the message listed below.
May 21 2002 Ethereal Network Sniffer Has Multiple Bugs That May Allow Remote Users to Send Packets to Execute Arbitrary Code or Cause the Sniffer to Hang or Crash



 Source Message Contents

Subject:  [RHSA-2002:088-06] Updated ethereal packages are available


---------------------------------------------------------------------
                   Red Hat, Inc. Red Hat Security Advisory

Synopsis:          Updated ethereal packages are available
Advisory ID:       RHSA-2002:088-06
Issue date:        2002-05-16
Updated on:        2002-06-04
Product:           Red Hat Linux
Keywords:          ethereal asn1 crash buffer overflow
Cross references:  
Obsoletes:         
CVE Names:         CAN-2002-0012 CAN-2002-0013 CAN-2002-0353 CAN-2002-0401 CAN-2002-0402 CAN-2002-0403 CAN-2002-0404
---------------------------------------------------------------------

1. Topic:

Updated ethereal packages are available which fix several security problems.

2. Relevant releases/architectures:

Red Hat Linux 7.2 - i386, ia64

Red Hat Linux 7.3 - i386

3. Problem description:

Ethereal is a package designed for monitoring network traffic on your
system.  Several security issues have been found in Ethereal:

Due to improper string and error handling in Ethereal's ASN.1 parser, it is
possible for a malformed SNMP or LDAP packet to cause a memory allocation
or buffer overrun error in Ethereal versions before 0.9.2 (CAN-2002-0013
CAN-2002-0012)

The ASN.1 parser in Ethereal 0.9.2 and earlier allows remote attackers to
cause a denial of service (crash) via a certain malformed packet, which
causes Ethereal to allocate memory incorrectly, possibly due to zero-length
fields. (CAN-2002-0353)

The SMB dissector in Ethereal prior to version 0.9.2 allows remote
attackers to cause a denial of service (crash) or execute arbitrary code
via malformed packets that cause Ethereal to dereference a NULL pointer.
(CAN-2002-0401)

A buffer overflow in X11 dissector in Ethereal before 0.9.3 allows
remote attackers to cause a denial of service (crash) and possibly
execute arbitrary code while Ethereal is parsing keysyms. (CAN-2002-0402)

The DNS dissector in Ethereal before 0.9.3 allows remote attackers to
cause a denial of service (CPU consumption) via a malformed packet
that causes Ethereal to enter an infinite loop. (CAN-2002-0403)

A vulnerability in GIOP dissector in Ethereal before 0.9.3 allows remote
attackers to cause a denial of service (memory consumption). (CAN-2002-0404)

Users of Ethereal should update to the errata packages containing Ethereal
version 0.9.4 which is not vulnerable to these issues.

4. Solution:

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

To update all RPMs for your particular architecture, run:

rpm -Fvh [filenames]

where [filenames] is a list of the RPMs you wish to upgrade.  Only those
RPMs which are currently installed will be updated.  Those RPMs which are
not installed but included in the list will not be updated.  Note that you
can also use wildcards (*.rpm) if your current directory *only* contains the
desired RPMs.

Please note that this update is also available via Red Hat Network.  Many
people find this an easier way to apply updates.  To use Red Hat Network,
launch the Red Hat Update Agent with the following command:

up2date

This will start an interactive process that will result in the appropriate
RPMs being upgraded on your system.

5. Bug IDs fixed (http://bugzilla.redhat.com/bugzilla for more info):



6. RPMs required:

Red Hat Linux 7.2:

SRPMS:
ftp://updates.redhat.com/7.2/en/os/SRPMS/ethereal-0.9.4-0.7.2.0.src.rpm

i386:
ftp://updates.redhat.com/7.2/en/os/i386/ethereal-0.9.4-0.7.2.0.i386.rpm
ftp://updates.redhat.com/7.2/en/os/i386/ethereal-gnome-0.9.4-0.7.2.0.i386.rpm

ia64:
ftp://updates.redhat.com/7.2/en/os/ia64/ethereal-0.9.4-0.7.2.0.ia64.rpm
ftp://updates.redhat.com/7.2/en/os/ia64/ethereal-gnome-0.9.4-0.7.2.0.ia64.rpm

Red Hat Linux 7.3:

SRPMS:
ftp://updates.redhat.com/7.3/en/os/SRPMS/ethereal-0.9.4-0.7.3.0.src.rpm

i386:
ftp://updates.redhat.com/7.3/en/os/i386/ethereal-0.9.4-0.7.3.0.i386.rpm
ftp://updates.redhat.com/7.3/en/os/i386/ethereal-gnome-0.9.4-0.7.3.0.i386.rpm



7. Verification:

MD5 sum                          Package Name
--------------------------------------------------------------------------
8ab27ce7ccaec617b4e5bee0f6cafc8a 7.2/en/os/SRPMS/ethereal-0.9.4-0.7.2.0.src.rpm
a82a1bf914b31bc283c4786a6d005f5a 7.2/en/os/i386/ethereal-0.9.4-0.7.2.0.i386.rpm
95b0e675cc1be0b5d59a2b3becf2420c 7.2/en/os/i386/ethereal-gnome-0.9.4-0.7.2.0.i386.rpm
c370c2585040f9174ebe6b20def17764 7.2/en/os/ia64/ethereal-0.9.4-0.7.2.0.ia64.rpm
2096533a5f9352ff47b4fd01302b7c92 7.2/en/os/ia64/ethereal-gnome-0.9.4-0.7.2.0.ia64.rpm
70022f6df52ad74013ab2901fe6f0e3d 7.3/en/os/SRPMS/ethereal-0.9.4-0.7.3.0.src.rpm
52a3074dea1e4e9563558e523a659bc5 7.3/en/os/i386/ethereal-0.9.4-0.7.3.0.i386.rpm
1650416f14b9f6a7cb15aa2f38f20bf4 7.3/en/os/i386/ethereal-gnome-0.9.4-0.7.3.0.i386.rpm
 

These packages are GPG signed by Red Hat, Inc. for security.  Our key
is available at:
    http://www.redhat.com/about/contact/pgpkey.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 --nogpg <filename>

8. References:

http://www.ethereal.com/appnotes/enpa-sa-00001.html
http://www.ethereal.com/appnotes/enpa-sa-00003.html
http://www.ethereal.com/appnotes/enpa-sa-00004.html
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0012
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0013
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0353
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0401
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0402
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0403
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0404



Copyright(c) 2000, 2001, 2002 Red Hat, Inc.



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