FreeBSD Security Advisories
2000-Dec-20 07:27 UTC
FreeBSD Ports Security Advisory: FreeBSD-SA-00:81.ethereal
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============================================================================FreeBSD-SA-00:81
Security Advisory
FreeBSD, Inc.
Topic: ethereal allows remote code execution
Category: ports
Module: ethereal
Announced: 2000-12-20
Credits: mat@hacksware.com
Affects: Ports collection prior to the correction date.
Corrected: 2000-11-21
Vendor status: Updated version released
FreeBSD only: NO
I. Background
ethereal is a tool for monitoring network activity.
II. Problem Description
The ethereal port, versions prior to 0.8.14, contains buffer overflows
which allow a remote attacker to crash ethereal or execute arbitrary
code on the local system as the user running ethereal, typically the
root user. These vulnerabilities are identical to those described in
advisory 00:61 relating to tcpdump.
The ethereal port is not installed by default, nor is it "part of
FreeBSD" as such: it is part of the FreeBSD ports collection, which
contains over 4200 third-party applications in a ready-to-install
format. The ports collections shipped with FreeBSD 3.5.1 and 4.2 are
vulnerable to this problem since it was discovered after the releases.
FreeBSD makes no claim about the security of these third-party
applications, although an effort is underway to provide a security
audit of the most security-critical ports.
III. Impact
Remote users can cause the local ethereal process to crash, or
to execute arbitrary code as the user running ethereal (usually root).
IV. Workaround
Do not use vulnerable versions of ethereal in network environments
which may contain packets from untrusted sources.
Deinstall the ethereal port/package, if you have installed it.
V. Solution
One of the following:
1) Upgrade your entire ports collection and rebuild the ethereal port.
2) Deinstall the old package and install a new package dated after the
correction date, obtained from the following directories:
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-3-stable/net/ethereal-0.8.14.tgz
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-4-stable/net/ethereal-0.8.14.tgz
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-4-stable/net/ethereal-0.8.14.tgz
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/net/ethereal-0.8.14.tgz
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-5-current/net/ethereal-0.8.14.tgz
3) download a new port skeleton for the ethereal port from:
http://www.freebsd.org/ports/
and use it to rebuild the port.
4) Use the portcheckout utility to automate option (3) above. The
portcheckout port is available in /usr/ports/devel/portcheckout or the
package can be obtained from:
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-3-stable/devel/portcheckout-2.0.tgz
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-4-stable/devel/portcheckout-2.0.tgz
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-4-stable/devel/portcheckout-2.0.tgz
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/devel/portcheckout-2.0.tgz
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-5-current/devel/portcheckout-2.0.tgz
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