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Cisco Bug: CSCvs01456 - Cisco Mobility Management Entity Denial of Service Vulnerability

Last Modified

Oct 02, 2020

Products (2)

  • Cisco ASR 5000 Series
  • Cisco ASR 5500

Known Affected Releases

21.10.0.70597 21.12.16 21.14.17 21.16.1 21.17.0 21.19.0 21.19.n1 To-be-fixed

Description (partial)

Symptom:
A vulnerability in the implementation of the Stream Control Transmission Protocol (SCTP) on Cisco Mobility Management Entity (MME) could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an eNodeB that is connected to an affected device.

The vulnerability is due to insufficient input validation of SCTP traffic. An attacker could exploit this vulnerability by leveraging a man-in-the-middle position between the eNodeB and the MME and then sending a crafted SCTP message to the MME. A successful exploit would cause the MME to stop sending SCTP messages to the eNodeB, triggering a DoS condition.

Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200108-mme-dos

Conditions:
At the time of publication, this vulnerability affected Cisco StarOS releases earlier than Release 21.16.1 that were running as MME.

At the time of publication, Cisco StarOS releases 21.16.1 and later contained the fix for this vulnerability.
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