Linux UDP packets allows remote attacker to fingerprint operating system

linux-udp-fingerprint (8588) The risk level is classified as LowLow Risk


The UDP implementation in Linux kernel could allow a remote attacker to identify the operating system being used. UDP packets in Linux kernel versions 2.4.x are transmitted with a constant IP Identification field set to 0.


Obtain Information


No remedy available as of September 1, 2014.


  • BugTraq Mailing List, Tue Mar 19 2002 - 05:12:36 CST: Identifying Kernel 2.4.x based Linux machines using UDP.
  • BID-4314: Linux 2.4 UDP Constant IP Identification Field Fingerprinting Vulnerability
  • CVE-2002-0510: The UDP implementation in Linux 2.4.x kernels keeps the IP Identification field at 0 for all non-fragmented packets, which could allow remote attackers to determine that a target system is running Linux.
  • OSVDB ID: 9587: Linux Kernel UDP Implementation IP Identification Field Remote OS Disclosure

Platforms Affected:

  • Linux Kernel 2.4.0
  • Linux Kernel 2.4.1
  • 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 2.4.2
  • Linux Kernel 2.4.3
  • 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


Mar 19, 2002

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