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AUSCERT External Security Bulletin Redistribution
ESB-2020.0800
Cisco ESA, Cisco WSA, and Cisco SMA GUI Denial of Service Vulnerability
5 March 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Email Security Appliance
Cisco Web Security Appliance
Cisco Content Security Management Appliance
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: None
CVE Names: CVE-2020-3164
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cont-sec-gui-dos-nJ625dXb
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Cisco ESA, Cisco WSA, and Cisco SMA GUI Denial of Service Vulnerability
Priority: Medium
Advisory ID: cisco-sa-cont-sec-gui-dos-nJ625dXb
First Published: 2020 March 4 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds availableCisco Bug IDs: CSCvq96943CSCvs33296CSCvs33306
CVE-2020-3164
CWE-20
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-based management interface of Cisco AsyncOS for
Cisco Email Security Appliance (ESA), Cisco Web Security Appliance (WSA),
and Cisco Content Security Management Appliance (SMA) could allow an
unauthenticated remote attacker to cause high CPU usage on an affected
device, resulting in a denial of service (DoS) condition.
The vulnerability is due to improper validation of specific HTTP request
headers. An attacker could exploit this vulnerability by sending a
malformed HTTP request to an affected device. A successful exploit could
allow the attacker to trigger a prolonged status of high CPU utilization
relative to the GUI process(es). Upon successful exploitation of this
vulnerability, an affected device will still be operative, but its response
time and overall performance may be degraded.
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-cont-sec-gui-dos-nJ625dXb
Affected Products
o Vulnerable Products
At the time of publication, this vulnerability affected the following Cisco
products if they were running an affected software version:
Cisco ESA and Cisco Cloud Email Security Release 13.0.0-392 and earlier
Cisco WSA Release 12.0.1-268 and earlier
Cisco SMA releases earlier than 13.6.0
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
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 by Vijay Kumar D V of Cisco 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-cont-sec-gui-dos-nJ625dXb
Revision History
o +----------+---------------------------+----------+--------+--------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+--------------+
| 1.0 | Initial public release. | - | Final | 2020-MAR-04 |
+----------+---------------------------+----------+--------+--------------+
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