Linux kernel Netfilter using Network Address Translation (NAT) could leak sensitive information
| linux-netfilter-information-leak (9043) |  Medium Risk |
Description:
Netfilter could allow a remote attacker to obtain sensitive information. If Network Address Translation (NAT) is being used by the firewall and is applied to the first packet of a connection, an ICMP error message could be generated by this packet, which would be sent out with the translated address. The address information sent out could allow a remote attacker to determine the Netfilter configuration and network topology information, which could be used by the attacker in preparing for further attacks against the affected network.
Consequences:
Obtain Information
Remedy:
Apply the patch for this vulnerability, as listed in Cartel S?curit? --- Security Advisory CARTSA-20020402. See References.
References:
- Cartel Sécurité --- Security Advisory CARTSA-20020402: Linux Netfilter NAT/ICMP code information leak.
- Hewlett-Packard Company Security Bulletin HPSBTL0205-039: Security vulnerability in Netfilter. (From SecurityFocus archive.)
- BID-4699: Linux NetFilter NAT Information Leakage Vulnerability
- CVE-2002-0704: The Network Address Translation (NAT) capability for Netfilter (iptables) 1.2.6a and earlier leaks translated IP addresses in ICMP error messages.
- MDKSA-2002:030: Temporary fix for iptables NAT/ICMP information leak
- OSVDB ID: 5130: Linux IPTables/Netfilter Internal Translated IP Disclosure
- RHSA-2002-086: Netfilter information leak
Platforms Affected:
- HP Secure OS 1.0
- Linux Kernel 2.4.10
- Linux Kernel 2.4.11
- Linux Kernel 2.4.12
- Linux Kernel 2.4.13
- Linux Kernel 2.4.14
- Linux Kernel 2.4.15
- Linux Kernel 2.4.16
- Linux Kernel 2.4.17
- Linux Kernel 2.4.18
- Linux Kernel 2.4.19 pre2
- Linux Kernel 2.4.19 pre3
- Linux Kernel 2.4.19 pre4
- Linux Kernel 2.4.19 pre5
- Linux Kernel 2.4.19 pre6
- Linux Kernel 2.4.19 pre1
- Linux Kernel 2.4.4
- Linux Kernel 2.4.5
- Linux Kernel 2.4.6
- Linux Kernel 2.4.7
- Linux Kernel 2.4.8
- Linux Kernel 2.4.9
- MandrakeSoft Mandrake Linux 8.0
- MandrakeSoft Mandrake Linux 8.1
- MandrakeSoft Mandrake Linux 8.2
Reported:
May 08, 2002
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