Tcpdump Vulnerabilities in ISAKMP Parsing

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200404-03 / tcpdump
Release Date	March 31, 2004
Latest Revision	March 31, 2004: 01
Impact	high
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
net-analyzer/tcpdump	<= 3.8.1	>= 3.8.3-r1	All supported architectures
net-libs/libpcap	<= 0.8.1-r1	>= 0.8.3-r1	All supported architectures

Related bugreports: #38206, #46258

Synopsis

There are multiple vulnerabilities in tcpdump and libpcap related to parsing of ISAKMP packets.

2. Impact Information

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.

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.

3. Resolution Information

Workaround

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.

Code Listing 3.1: Resolution

# 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"

4. References

Page updated March 31, 2004

Summary: This is a Gentoo Linux Security Advisory

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