| 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
Path Revision
--------------------------------------------------------------------------------------------------------
| 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
|
Security Advisory 
Postfix - "Krok po kroku" v1.0
sdi.sh
uEagle 1.0p1
