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Home » Hacking News » CLA-2002:480-tcpdump

CLA-2002:480-tcpdump

by Nikola Strahija on May 8th, 2002 Tcpdump is a command-line tool for monitoring network traffic. It uses libpcap, a library which provides a portable framework for low-level network monitoring. Both are developed by the same team[1]. This advisory addresses problems found in both projects.


tcpdump buffer overflows: during a tcpdump code auditing done by
FreeBSD developers, several buffer overflows were discovered[2] in
tcpdump versions prior to 3.5. New versions (including 3.6.2) are
also vulnerable to another buffer overflow[3] in AFS RPC decoding
functions, as pointed out by Nick Cleaton .

These vulnerablities could be exploited by a remote attacker to crash
the tcpdump process or even execute arbitrary code as the user
running tcpdump (which usually is root).

libpcap 0.6 has been audited and a better buffer boundary checking
was implemented in several functions, thus making it more safe.

This upgrade also fixes a lot of minor bugs[4] in both tcpdump and
libpcap. Notice that the number of vulnerabilities and bug fixes
which apply to every version of Conectiva Linux varies accordingly to
the tcpdump/libpcap versions included in it. This update brings all
packages to the most recent version as of this date plus the tcpdump
security patches which have not yet been included in the upstream
stable version (3.6.2).


SOLUTION
All tcpdump users should upgrade their packages immediately. If
you're only using libpcap, you should also consider upgrading since
this new version solves several minor bugs.


REFERENCES:
1.http://www.tcpdump.org/
2.http://www.ciac.org/ciac/bulletins/l-015.shtml

3.ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-01:48.tcpdump.asc
3.http://www.tcpdump.org/tcpdump-changes.txt


DIRECT DOWNLOAD LINKS TO THE UPDATED PACKAGES
ftp://atualizacoes.conectiva.com.br/5.0/i386/arpwatch-2.1a11-9U50_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/5.0/i386/libpcap-0.6.2-1U50_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/5.0/i386/libpcap-devel-0.6.2-1U50_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/5.0/i386/libpcap-devel-static-0.6.2-1U50_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/5.0/i386/tcpdump-3.6.2-1U50_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/5.0/SRPMS/tcpdump-3.6.2-1U50_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/5.1/i386/arpwatch-2.1a11-9U51_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/5.1/i386/libpcap-0.6.2-1U51_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/5.1/i386/libpcap-devel-0.6.2-1U51_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/5.1/i386/libpcap-devel-static-0.6.2-1U51_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/5.1/i386/tcpdump-3.6.2-1U51_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/5.1/SRPMS/tcpdump-3.6.2-1U51_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/arpwatch-2.1a11-9U60_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/libpcap-0.6.2-1U60_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/libpcap-devel-0.6.2-1U60_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/libpcap-devel-static-0.6.2-1U60_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/tcpdump-3.6.2-1U60_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/6.0/SRPMS/tcpdump-3.6.2-1U60_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/arpwatch-2.1a11-9U70_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/libpcap-0.6.2-1U70_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/libpcap-devel-0.6.2-1U70_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/libpcap-devel-static-0.6.2-1U70_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/tcpdump-3.6.2-1U70_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/SRPMS/tcpdump-3.6.2-1U70_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/libpcap-0.6.2-4U8_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/libpcap-devel-0.6.2-4U8_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/libpcap-devel-static-0.6.2-4U8_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/tcpdump-3.6.2-3U8_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/SRPMS/libpcap-0.6.2-4U8_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/8/SRPMS/tcpdump-3.6.2-3U8_1cl.src.rpm


ADDITIONAL INSTRUCTIONS
Users of Conectiva Linux version 6.0 or higher may use apt to perform
upgrades of RPM packages:
- add the following line to /etc/apt/sources.list if it is not there yet
(you may also use linuxconf to do this):

rpm [cncbr] ftp://atualizacoes.conectiva.com.br 6.0/conectiva updates

(replace 6.0 with the correct version number if you are not running CL6.0)

- run: apt-get update
- after that, execute: apt-get upgrade

Detailed instructions reagarding the use of apt and upgrade examples
can be found at http://distro.conectiva.com.br/atualizacoes/#apt?idioma=en


- -------------------------------------------------------------------------
All packages are signed with Conectiva's GPG key. The key and instructions
on how to import it can be found at
http://distro.conectiva.com.br/seguranca/chave/?idioma=en
Instructions on how to check the signatures of the RPM packages can be
found at http://distro.conectiva.com.br/seguranca/politica/?idioma=en
- -------------------------------------------------------------------------
All our advisories and generic update instructions can be viewed at
http://distro.conectiva.com.br/atualizacoes/?idioma=en

- -------------------------------------------------------------------------
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