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AUSCERT External Security Bulletin Redistribution
ESB-2005.0428 -- FreeBSD-SA-05:10.tcpdump
Infinite loops in tcpdump protocol decoding
10 June 2005
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AusCERT Security Bulletin Summary
---------------------------------
Product: tcpdump
Publisher: FreeBSD
Operating System: FreeBSD
UNIX variants
Linux variants
Windows
Mac OS X
Impact: Denial of Service
Access: Remote/Unauthenticated
CVE Names: CAN-2005-1280 CAN-2005-1279 CAN-2005-1278
CAN-2005-1267
Ref: ESB-2005.0381
Original Bulletin:
ftp://ftp.freebsd.org/pub/FreeBSD/CERT/Advisories/FreeBSD-SA-05:10.tcpdump.asc
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FreeBSD-SA-05:10.tcpdump Security Advisory
The FreeBSD Project
Topic: Infinite loops in tcpdump protocol decoding
Category: contrib
Module: tcpdump
Announced: 2005-06-09
Credits: "Vade 79", Simon L. Nielsen
Affects: FreeBSD 5.3-RELEASE and FreeBSD 5.4-RELEASE
Corrected: 2005-06-08 21:26:27 UTC (RELENG_5, 5.4-STABLE)
2005-06-08 21:27:44 UTC (RELENG_5_4, 5.4-RELEASE-p2)
2005-06-08 21:29:15 UTC (RELENG_5_3, 5.3-RELEASE-p16)
CVE Name: CAN-2005-1267, CAN-2005-1278, CAN-2005-1279, CAN-2005-1280
For general information regarding FreeBSD Security Advisories,
including descriptions of the fields above, security branches, and the
following sections, please visit
<URL:http://www.freebsd.org/security/>.
I. Background
The tcpdump utility is used to capture and examine network traffic.
II. Problem Description
Several tcpdump protocol decoders contain programming errors which can
cause them to go into infinite loops.
III. Impact
An attacker can inject specially crafted packets into the network
which, when processed by tcpdump, could lead to a denial-of-service.
After the attack, tcpdump would no longer capture traffic, and would
potentially use all available processor time.
IV. Workaround
No workaround is available.
V. Solution
Perform one of the following:
1) Upgrade your vulnerable system to 5-STABLE, or to the RELENG_5_4
or RELENG_5_3 security branch dated after the correction date.
2) To patch your present system:
The following patches have been verified to apply to FreeBSD 5.3 and
5.4 systems.
a) Download the relevant patch from the location below, and verify the
detached PGP signature using your PGP utility.
# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:10/tcpdump.patch
# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:10/tcpdump.patch.asc
b) Execute the following commands as root:
# cd /usr/src
# patch < /path/to/patch
# cd /usr/src/usr.sbin/tcpdump/tcpdump
# make obj && make depend && make && make install
VI. Correction details
The following list contains the revision numbers of each file that was
corrected in FreeBSD.
Branch Revision
Path
- - -------------------------------------------------------------------------
RELENG_5
src/contrib/tcpdump/print-bgp.c 1.1.1.5.2.1
src/contrib/tcpdump/print-isoclns.c 1.12.2.1
src/contrib/tcpdump/print-ldp.c 1.1.1.1.2.1
src/contrib/tcpdump/print-rsvp.c 1.1.1.1.2.1
RELENG_5_4
src/UPDATING 1.342.2.24.2.11
src/sys/conf/newvers.sh 1.62.2.18.2.7
src/contrib/tcpdump/print-bgp.c 1.1.1.5.6.1
src/contrib/tcpdump/print-isoclns.c 1.12.6.1
src/contrib/tcpdump/print-ldp.c 1.1.1.1.6.1
src/contrib/tcpdump/print-rsvp.c 1.1.1.1.6.1
RELENG_5_3
src/UPDATING 1.342.2.13.2.19
src/sys/conf/newvers.sh 1.62.2.15.2.21
src/contrib/tcpdump/print-bgp.c 1.1.1.5.4.1
src/contrib/tcpdump/print-isoclns.c 1.12.4.1
src/contrib/tcpdump/print-ldp.c 1.1.1.1.4.1
src/contrib/tcpdump/print-rsvp.c 1.1.1.1.4.1
- - -------------------------------------------------------------------------
VII. References
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-1267
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-1278
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-1279
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-1280
http://marc.theaimsgroup.com/?l=bugtraq&m=111454406222040
http://marc.theaimsgroup.com/?l=bugtraq&m=111454461300644
The latest revision of this advisory is available at
ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-05:10.tcpdump.asc
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