Linux kernel Netfilter using Network Address Translation (NAT) could leak sensitive information

linux-netfilter-information-leak (9043) The risk level is classified as MediumMedium Risk


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.


Obtain Information


Apply the patch for this vulnerability, as listed in Cartel S?curit? --- Security Advisory CARTSA-20020402. See References.


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


May 08, 2002

The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall the author/distributor (IBM Internet Security Systems X-Force) be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

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