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AUSCERT External Security Bulletin Redistribution
ESB-2020.0081
Cisco Mobility Management Entity Denial of Service Vulnerability
9 January 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Mobility Management Entity
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2019-16026
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200108-mme-dos
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Cisco Mobility Management Entity Denial of Service Vulnerability
Priority: Medium
Advisory ID: cisco-sa-20200108-mme-dos
First Published: 2020 January 8 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvs01456
CVE-2019-16026
CWE-20
CVSS Score:
6.8 AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H/E:X/RL:X/RC:X
Summary
o 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
Affected Products
o Vulnerable Products
At the time of publication, this vulnerability affected Cisco StarOS
releases earlier than Release 21.16.1 that were running as MME.
See the Details section in the bug ID(s) at the top of this advisory for
the most complete and current information.
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory
are known to be affected by this vulnerability.
Workarounds
o There are no workarounds that address this vulnerability.
Fixed Software
o When considering software upgrades , customers are advised to regularly
consult the advisories for Cisco products, which are available from the
Cisco Security Advisories and Alerts page , to determine exposure and a
complete upgrade solution.
In all cases, customers should ensure that the devices to be upgraded
contain sufficient memory and confirm that current hardware and software
configurations will continue to be supported properly by the new release.
If the information is not clear, customers are advised to contact the Cisco
Technical Assistance Center (TAC) or their contracted maintenance
providers.
Fixed Releases
At the time of publication, Cisco StarOS releases 21.16.1 and later
contained the fix for this vulnerability.
See the Details section in the bug ID(s) at the top of this advisory for
the most complete and current information.
Exploitation and Public Announcements
o The Cisco Product Security Incident Response Team (PSIRT) is not aware of
any public announcements or malicious use of the vulnerability that is
described in this advisory.
Source
o This vulnerability was found during internal security testing.
Cisco Security Vulnerability Policy
o To learn about Cisco security vulnerability disclosure policies and
publications, see the Security Vulnerability Policy . This document also
contains instructions for obtaining fixed software and receiving security
vulnerability information from Cisco.
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
cisco-sa-20200108-mme-dos
Revision History
o +---------+--------------------------+---------+--------+-----------------+
| Version | Description | Section | Status | Date |
+---------+--------------------------+---------+--------+-----------------+
| 1.0 | Initial public release. | - | Final | 2020-January-08 |
+---------+--------------------------+---------+--------+-----------------+
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