OpenBSD ISAKMP delete payload denial of service

openbsd-isakmp-delete-dos (15630) The risk level is classified as MediumMedium Risk

Description:

Internet Security Association and Key Management Protocol (ISAKMP), when running in OpenBSD implementations, is vulnerable to a denial of service, caused by improper validation of payloads. By sending a specially-crafted ISAKMP packet containing a malformed delete payload with a large number of Security Parameter Indexes (SPI), a remote attacker could cause the ISAKMP daemon to crash.


Consequences:

Denial of Service

Remedy:

For OpenBSD 3.4:
Apply the 015_isakmpd2.patch, available from the OpenBSD 3.4 errata Web site. See References.

For OpenBSD 3.3:
Apply the 020_isakmpd2.patch, available from the OpenBSD 3.4 errata Web site. See References.

References:

  • OpenBSD 3.3 errata Web site: 015: SECURITY FIX: February 5, 2004.
  • OpenBSD 3.4 errata Web site: 015: RELIABILITY FIX: March 17, 2004.
  • Rapid7, Inc. Security Advisory R7-0018: OpenBSD isakmpd payload handling denial-of-service vulnerabilities.
  • BID-10031: OpenBSD ISAKMPD Delete Payload Denial Of Service Vulnerability
  • BID-9907: OpenBSD isakmpd Multiple Unspecified Remote Denial Of Service Vulnerabilities
  • CVE-2004-0221: isakmpd in OpenBSD 3.4 and earlier allows remote attackers to cause a denial of service (crash) via an ISAKMP packet with a delete payload containing a large number of SPIs, which triggers an out-of-bounds read error, as demonstrated by the Striker ISAKMP Protocol Test Suite.
  • OSVDB ID: 5700: OpenBSD isakmpd Delete Payload Handling DoS
  • SECTRACK ID: 1009468: isakmpd Payload Handling Flaw Lets Remote Users Crash the Daemon
  • US-CERT VU#524497: isakmpd crashes when handling ISAKMP packets with malformed Delete Payload

Platforms Affected:

  • OpenBSD OpenBSD 3.3
  • OpenBSD OpenBSD 3.4

Reported:

Mar 17, 2004

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