-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
===========================================================================
AUSCERT External Security Bulletin Redistribution
ESB-2020.2698
Cisco Small Business Smart and Managed Switches Denial of
Service Vulnerability
6 August 2020
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Small Business Smart and Managed Switches
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2020-3363
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sbss-ipv6-dos-3bLk6vA
- --------------------------BEGIN INCLUDED TEXT--------------------
Cisco Small Business Smart and Managed Switches Denial of Service Vulnerability
Priority: High
Advisory ID: cisco-sa-sbss-ipv6-dos-3bLk6vA
First Published: 2020 August 5 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvt45834
CVE-2020-3363
CWE-20
CVSS Score:
8.6 AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:X/RL:X/RC:X
Summary
o A vulnerability in the IPv6 packet processing engine of Cisco Small
Business Smart and Managed Switches could allow an unauthenticated, remote
attacker to cause a denial of service (DoS) condition on an affected
device.
The vulnerability is due to insufficient validation of incoming IPv6
traffic. An attacker could exploit this vulnerability by sending a crafted
IPv6 packet through an affected device. A successful exploit could allow
the attacker to cause an unexpected reboot of the switch, leading to a DoS
condition.
This vulnerability is specific to IPv6 traffic. IPv4 traffic is not
affected.
Cisco has released software updates that address this vulnerability for
devices that have not reached the end of software maintenance. 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-sbss-ipv6-dos-3bLk6vA
Affected Products
o Vulnerable Products
This vulnerability affects the following Cisco products if they are running
a vulnerable software release:
250 Series Smart Switches
350 Series Managed Switches
350X Series Stackable Managed Switches
550X Series Stackable Managed Switches
Small Business 200 Series Smart Switches
Small Business 300 Series Managed Switches
Small Business 500 Series Stackable Managed Switches
For information about which Cisco software releases are vulnerable, see the
Fixed Software section of this advisory.
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 Cisco has released free software updates that address the vulnerability
described in this advisory. Customers may only install and expect support
for software versions and feature sets for which they have purchased a
license. By installing, downloading, accessing, or otherwise using such
software upgrades, customers agree to follow the terms of the Cisco
software license: https://www.cisco.com/c/en/us/products/
end-user-license-agreement.html
Additionally, customers may only download software for which they have a
valid license, procured from Cisco directly, or through a Cisco authorized
reseller or partner. In most cases this will be a maintenance upgrade to
software that was previously purchased. Free security software updates do
not entitle customers to a new software license, additional software
feature sets, or major revision upgrades.
When considering software upgrades , customers are advised to regularly
consult the advisories for Cisco products, which are available from the
Cisco Security Advisories 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.
Customers Without Service Contracts
Customers who purchase directly from Cisco but do not hold a Cisco service
contract and customers who make purchases through third-party vendors but
are unsuccessful in obtaining fixed software through their point of sale
should obtain upgrades by contacting the Cisco TAC: https://www.cisco.com/c
/en/us/support/web/tsd-cisco-worldwide-contacts.html
Customers should have the product serial number available and be prepared
to provide the URL of this advisory as evidence of entitlement to a free
upgrade.
Fixed Releases
Cisco fixed this vulnerability in Release 2.5.5.47 for the following Cisco
products:
250 Series Smart Switches
350 Series Managed Switches
350X Series Stackable Managed Switches
550X Series Stackable Managed Switches
Customers can download the firmware from the Software Center on Cisco.com
by clicking Browse all and navigating to Switches > LAN Switches - Small
Business .
The following Cisco products have passed the end-of-software-maintenance
milestone. Although these switches are vulnerable, Cisco will not provide a
firmware fix.
Small Business 200 Series Smart Switches
Small Business 300 Series Managed Switches
Small Business 500 Series Stackable Managed Switches
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-sbss-ipv6-dos-3bLk6vA
Revision History
o +----------+---------------------------+----------+--------+--------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+--------------+
| 1.0 | Initial public release. | - | Final | 2020-AUG-05 |
+----------+---------------------------+----------+--------+--------------+
- --------------------------END INCLUDED TEXT--------------------
You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.
NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members. As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.
NOTE: This is only the original release of the security bulletin. It may
not be updated when updates to the original are made. If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.
Contact information for the authors of the original document is included
in the Security Bulletin above. If you have any questions or need further
information, please contact them directly.
Previous advisories and external security bulletins can be retrieved from:
https://www.auscert.org.au/bulletins/
===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
===========================================================================
-----BEGIN PGP SIGNATURE-----
Comment: http://www.auscert.org.au/render.html?it=1967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=VNXr
-----END PGP SIGNATURE-----
https://www.malwaredevil.com/2020/08/06/esb-2020-2698-cisco-cisco-small-business-smart-and-managed-switches-denial-of-service-remote-unauthenticated/?utm_source=rss&utm_medium=rss&utm_campaign=esb-2020-2698-cisco-cisco-small-business-smart-and-managed-switches-denial-of-service-remote-unauthenticated
No comments:
Post a Comment