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Category:   Device (Embedded Server/Appliance)  >   Cisco Unified Computing System Vendors:   Cisco
(Cisco Issues Fix for Cisco Unified Computing System) Linux Kernel IP Fragment Reassembly Algorithm Lets Remote Users Consume Excessive CPU Resources on the Target System
SecurityTracker Alert ID:  1041973
SecurityTracker URL:  http://securitytracker.com/id/1041973
CVE Reference:   CVE-2018-5391   (Links to External Site)
Date:  Oct 26 2018
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in the Linux kernel. A remote user can consume excessive CPU resources on the target system. Cisco Unified Computing System is affected.

The system uses an inefficient IP fragment reassembly algorithm. A remote user can send specially crafted fragmented data to consume excessive CPU resources on the target system.

Juha-Matti Tilli (Aalto University, Department of Communications and Networking / Nokia Bell Labs) reported this vulnerability.

Impact:   A remote user can consume excessive CPU resources on the target system.
Solution:   The vendor has issued a fix.

Cisco UCS B-Series M5 Blade Servers - Integrated Management Controller: CSCvm18261

Cisco UCS Standalone C-Series M5 Rack Server - Integrated Management Controller: CSCvm15466

The Cisco advisory is available at:

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180824-linux-ip-fragment

Vendor URL:  tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180824-linux-ip-fragment (Links to External Site)
Cause:   Resource error

Message History:   This archive entry is a follow-up to the message listed below.
Aug 15 2018 Linux Kernel IP Fragment Reassembly Algorithm Lets Remote Users Consume Excessive CPU Resources on the Target System



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