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AUSCERT External Security Bulletin Redistribution
ESB-2019.2997
Cisco IoT Field Network Director TLS Renegotiation Denial of
Service Vulnerability
8 August 2019
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco IoT Field Network Director
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2019-1957
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190807-fnd-dos
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Cisco IoT Field Network Director TLS Renegotiation Denial of Service
Vulnerability
Priority: Medium
Advisory ID: cisco-sa-20190807-fnd-dos
First Published: 2019 August 7 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds availableCisco Bug IDs: CSCvp71888
CVE-2019-1957
CWE-399
CVSS Score:
5.3 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:X/RL:X/RC:X
Summary
o A vulnerability in the web interface of Cisco IoT Field Network Director
could allow an unauthenticated, remote attacker to trigger high CPU usage,
resulting in a denial of service (DoS) condition on an affected device.
The vulnerability is due to improper handling of Transport Layer Security
(TLS) renegotiation requests. An attacker could exploit this vulnerability
by sending renegotiation requests at a high rate. A successful exploit
could increase the resource usage on the system, eventually leading to 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-20190807-fnd-dos
Affected Products
o Vulnerable Products
At the time of publication, this vulnerability affected Cisco IoT Field
Network Director releases earlier than 4.4.2-11.
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 Software
At the time of publication, Cisco IoT Field Network Director releases
4.4.2-11 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-20190807-fnd-dos
Revision History
o +---------+--------------------------+---------+--------+-----------------+
| Version | Description | Section | Status | Date |
+---------+--------------------------+---------+--------+-----------------+
| 1.0 | Initial public release. | - | Final | 2019-August-07 |
+---------+--------------------------+---------+--------+-----------------+
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