Cisco Patched Products Vulnerable to HTTP/2 Rapid Reset Attack

A new high-severity vulnerability has been discovered in multiple Cisco products, which could potentially allow HTTP/2 Rapid Reset Attack.

This vulnerability enables a novel distributed denial of service (DDoS) attack technique.

This vulnerability was assigned with CVE-2023-44487 and a severity rating of 7.5 (High).

In addition, this vulnerability has been known to be actively exploited by threat actors in the wild. 

CVE-2023-44487: HTTP/2 Rapid Reset

A threat actor could exploit this vulnerability by using the HTTP/2 protocol-level weakness, resulting in a Distributed Denial of Service condition on vulnerable Cisco devices.

The HTTP/2 rapid reset is a layer 7 attack that leverages the high efficiency of the HTTP/2 protocol feature, diverting them into a DDoS attack. 

A threat actor can make the client open multiple concurrent streams on a single TCP connection, each corresponding to one HTTP request.

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Affected Products

Network and Content Security Devices

Product	Fixed Release Availability
Secure Dynamic Attribute Connector (CSDAC)	2.2 (Nov 2023)2.3 (Nov 2023)
Secure Malware Analytics Appliance, formerly Threat Grid Appliance	2.19.2 (Dec 2023)
Secure Web Appliance, formerly Web Security Appliance (WSA)
Network Management and Provisioning
Business Process Automation	3.2.003.009 (Nov 2023)4.0.001.003 (Nov 2023)4.0.002.003 (Nov 2023)
Crosswork Data Gateway	4.1.3 (Dec 2023)5.0.2 (Dec 2023)6.0 (Dec 2023)
Crosswork Situation Manager	Contact Cisco TAC for upgrade options
Crosswork Zero Touch Provisioning (ZTP)	6.0.0 (Dec 2023)
Data Center Network Manager (DCNM) – SAN Deployments on Windows or Linux	Apply Workaround
IoT Field Network Director, formerly Connected Grid Network Management System	4.11.0 (Dec 2023)
Prime Access Registrar	9.3.3 (Feb 2024)
Prime Cable Provisioning	7.2.1 (Nov 2023)
Prime Infrastructure	3.10.4 (Dec 2023)
Prime Network Registrar	11.2 (Available)
Routing and Switching – Enterprise and Service Provider
IOS XE Software
IOS XR Software
IOx Fog Director	1.22 (Nov 2023)
Nexus 3000 Series Switches
Nexus 9000 Series Switches in standalone NX-OS mode
Ultra Cloud Core – Access and Mobility Management Function	2024.02.0 (May 2024)
Ultra Cloud Core – Policy Control Function	2024.01.0 (Feb 2024)
Ultra Cloud Core – Session Management Function
Voice and Unified Communications Devices
Enterprise Chat and Email	Apply Microsoft Windows Update or Workaround
Unified Attendant Console Advanced	Apply Microsoft Windows Update or Workaround
Unified Contact Center Domain Manager (CCDM)	Apply Microsoft Windows Update or Workaround
Unified Contact Center Enterprise (UCCE)	Apply Microsoft Windows Update or Workaround
Unified Contact Center Enterprise – Live Data server	12.6.2 (Nov 2023)
Unified Contact Center Express (UCCX)
Unified Contact Center Management Portal (CCMP)	Apply Microsoft Windows Update or Workaround
Video, Streaming, TelePresence, and Transcoding Devices
Expressway Series	X14.3.3 (Dec 2023)
TelePresence Video Communication Server (VCS)	X14.3.3 (Dec 2023)
Wireless
Connected Mobile Experiences	11.1 (Feb 2024)

Cisco has released security patches to fix this vulnerability on all of its affected versions and has urged its users to upgrade them appropriately to prevent them from getting exploited by threat actors.

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