Vulnerability Note VU#349113
isakmpd fails to handle ISAKMP packets with "Payload Length" of zero
A vulnerability exists in the isakmpd that could allow a remote attacker to cause a denial of service.
The OpenBSD isakmpd establishes security associations for encrypted and authenticated (IPsec) network traffic. It implements the Internet Security Association and Key Management Protocol (ISAKMP) and Internet Key Exchange (IKE) protocol. The ISAKMP standard specifies a "Payload Length" field within the "Generic Payload Header". This field is populated by the sender and specifies the length in octets of the current payload, including the generic payload header. A flaw in the handling of packets with a specified length of zero could cause isakmpd to enter an infinite loop, preempting normal operations.
This issue is reportedly similar to VU#738518.
A remote attacker could cause the isakmpd service to become unresponsive. Subsequent IPsec-enabled communications may be disrupted as a result.
Apply a patch from the vendor
Patches have been released to address this issue. Please see the Systems Affected section of this document for more details.
If you are a vendor and your product is affected, let
|Vendor||Status||Date Notified||Date Updated|
|OpenBSD||Affected||-||20 Aug 2004|
This vulnerability was discovered by
using their Striker test suite.
This document was written by Chad R Dougherty based on information published in
Rapid7 Advisory R7-0018
19 Mar 2004
Date First Published:
27 Aug 2004
Date Last Updated:
27 Aug 2004
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