(Gentoo Issues Fix) Tcpdump Can Be Crashed By a Remote User Sending a Malicious ISAKMP Packet
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SecurityTracker Alert ID: 1009697 |
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SecurityTracker URL: http://securitytracker.com/id/1009697
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CVE Reference:
CAN-2003-0989, CAN-2004-0057
(Links to External Site)
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Date: Apr 7 2004
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Impact:
Denial of service via network
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Fix Available: Yes Vendor Confirmed: Yes
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Version(s): 3.8.1 and prior versions
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Description:
Several vulnerabilities were reported in tcpdump in the processing of ISAKMP packets. A remote user can cause tcmpdump to crash or to enter an infinite loop.
It is reported that the rawprint() function in print-isakmp.c fails to validate its input arguments [CVE: CAN-2004-0057]. A remote user can send a specially crafted ISAKMP packet to cause the tcpdump process to crash. Red Hat credits Jonathan Heusser with discovering this flaw. Version 3.8.1 and prior versions are affected.
It is also reported that versions prior to 3.8.1 contain flaws that allow a remote user to force tcpdump to enter an infinite loop [CVE: CAN-2003-0989]. According to Red Hat, George Bakos discovered these flaws.
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Impact:
A remote user can cause the tcpdump process to crash or to enter an endless loop.
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Solution:
Gentoo has released a fix and indicates that all tcpdump users should upgrade to the latest available version and that the net-libs/libpcap package should be upgraded, as well:
# emerge sync
# emerge -pv ">=net-libs/libpcap-0.8.3-r1" ">=net-analyzer/tcpdump-3.8.3-r1"
# emerge ">=net-libs/libpcap-0.8.3-r1" ">=net-analyzer/tcpdump-3.8.3-r1"
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Vendor URL: cvs.tcpdump.org/cgi-bin/cvsweb/tcpdump/print-isakmp.c (Links to External Site)
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Cause:
Boundary error, Input validation error, State error
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Underlying OS:
Linux (Gentoo)
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Message History:
This archive entry is a follow-up to the message listed below.
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Source Message Contents
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Date: Tue, 6 Apr 2004 13:23:46 -0700
Subject: [gentoo-announce] [ GLSA 200404-03 ] Tcpdump Vulnerabilities in ISAKMP Parsing
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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
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Gentoo Linux Security Advisory GLSA 200404-03
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http://security.gentoo.org
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Severity: High
Title: Tcpdump Vulnerabilities in ISAKMP Parsing
Date: March 31, 2004
Bugs: #38206, #46258
ID: 200404-03
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Synopsis
========
There are multiple vulnerabilities in tcpdump and libpcap related to
parsing of ISAKMP packets.
Background
==========
Tcpdump is a program for monitoring IP network traffic. Libpcap is a
supporting library which is responsibile for capturing packets off a
network interface.
Affected packages
=================
-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
net-analyzer/tcpdump <= 3.8.1 >= 3.8.3-r1
net-libs/libpcap <= 0.8.1-r1 >= 0.8.3-r1
Description
===========
There are two specific vulnerabilities in tcpdump, outlined in [
reference 1 ]. In the first scenario, an attacker may send a
specially-crafted ISAKMP Delete packet which causes tcpdump to read
past the end of its buffer. In the second scenario, an attacker may
send an ISAKMP packet with the wrong payload length, again causing
tcpdump to read past the end of a buffer.
Impact
======
Remote attackers could potentially cause tcpdump to crash or execute
arbitrary code as the 'pcap' user.
Workaround
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There is no known workaround at this time. All tcpdump users are
encouraged to upgrade to the latest available version.
Resolution
==========
All tcpdump users should upgrade to the latest available version.
ADDITIONALLY, the net-libs/libpcap package should be upgraded.
# emerge sync
# emerge -pv ">=net-libs/libpcap-0.8.3-r1"
">=net-analyzer/tcpdump-3.8.3-r1"
# emerge ">=net-libs/libpcap-0.8.3-r1" ">=net-analyzer/tcpdump-3.8.3-r1"
References
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[ 1 ] http://www.rapid7.com/advisories/R7-0017.html
[ 2 ] http://rhn.redhat.com/errata/RHSA-2004-008.html
[ 3 ] http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0989
Concerns?
=========
Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users machines is of utmost
importance to us. Any security concerns should be addressed to
security@gentoo.org or alternatively, you may file a bug at
http://bugs.gentoo.org.
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