CVE-2005-4437 - Cisco EIGRP Protocol HELLO Packet Replay Vulnerability

Publication

2005-12-21

Last modification

2018-10-19

Summary

MD5 Neighbor Authentication in Extended Interior Gateway Routing Protocol (EIGRP) 1.2, as implemented in Cisco IOS 11.3 and later, does not include the Message Authentication Code (MAC) in the checksum, which allows remote attackers to sniff message hashes and (1) replay EIGRP HELLO messages or (2) cause a denial of service by sending a large number of spoofed EIGRP neighbor announcements, which results in an ARP storm on the local network.

Risk level (CVSS AV:N/AC:L/Au:N/C:P/I:P/A:P)

High

7.5

Access Vector

  • Network
  • Adjacent Network
  • Local

Access Complexity

  • Low
  • Medium
  • High

Authentication

  • None
  • Single
  • Multiple

Confident. Impact

  • Complete
  • Partial
  • None

Integrity Impact

  • Complete
  • Partial
  • None

OVAL definition

{
    "accepted": "2008-09-08T04:00:41.335-04:00",
    "class": "vulnerability",
    "contributors": [
        {
            "name": "Yuzheng Zhou",
            "organization": "Hewlett-Packard"
        }
    ],
    "description": "MD5 Neighbor Authentication in Extended Interior Gateway Routing Protocol (EIGRP) 1.2, as implemented in Cisco IOS 11.3 and later, does not include the Message Authentication Code (MAC) in the checksum, which allows remote attackers to sniff message hashes and (1) replay EIGRP HELLO messages or (2) cause a denial of service by sending a large number of spoofed EIGRP neighbor announcements, which results in an ARP storm on the local network.",
    "family": "ios",
    "id": "oval:org.mitre.oval:def:5741",
    "status": "accepted",
    "submitted": "2008-05-26T11:06:36.000-04:00",
    "title": "Cisco \"EIGRP\" Protocol \"HELLO\" Packet Replay Vulnerability",
    "version": "3"
}