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AUSCERT External Security Bulletin Redistribution
ESB-2019.2440
Cisco Small Business Series Switches Vulnerabilities
4 July 2019
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Small Business Series Switches
Publisher: Cisco Systems
Operating System: Network Appliance
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2019-1892 CVE-2019-1891
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190703-sbss-dos
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190703-sbss-memcorrupt
Comment: This bulletin contains two (2) Cisco Systems security advisories.
- --------------------------BEGIN INCLUDED TEXT--------------------
Cisco Small Business Series Switches HTTP Denial of Service Vulnerability
Priority: High
Advisory ID: cisco-sa-20190703-sbss-dos
First Published: 2019 July 3 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds availableCisco Bug IDs: CSCvp43403CSCvp43417
CVE-2019-1891
CWE-20
CVSS Score:
7.5 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:X/RL:X/RC:X
Summary
o
A vulnerability in the web interface of Cisco Small Business 200, 300, and
500 Series 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 improper validation of requests sent to the web
interface. An attacker could exploit this vulnerability by sending a
malicious request to the web interface of an affected device. A successful
exploit could allow the attacker to cause an unexpected reload of the
device, resulting in 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-20190703-sbss-dos
Affected Products
o Vulnerable Products
This vulnerability affects Cisco Small Business 200, 300, and 500 Series
Managed Switches running software releases prior to 1.4.10.6 with the web
management interface enabled.
On Cisco Small Business 200 Series, the web interface is always enabled.
On Cisco Small Business 300 and 500 Series, a device is not vulnerable if
both of the following lines are present in the configuration:
no ip http server
no ip http secure-server
Refer to the Cisco product release notes for the complete list of
vulnerable product models:
Release Notes for 200, 300, and 500 Series Switches .
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory
are known to be affected by this vulnerability.
Cisco has confirmed that this vulnerability does not affect the following
Cisco products:
Cisco Small Business 250, 350, 550 Series Switches
Cisco Small Business 220 Series Smart Switches
Cisco ESW2 Series Managed Switches
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 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.
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
This vulnerability is fixed in Software Release 1.4.10.6 and later.
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-20190703-sbss-dos
Revision History
o +---------+---------------------------+---------+--------+---------------+
| Version | Description | Section | Status | Date |
+---------+---------------------------+---------+--------+---------------+
| 1.0 | Initial public release. | - | Final | 2019-July-03 |
+---------+---------------------------+---------+--------+---------------+
- --------------------------------------------------------------------------------
Cisco Small Business Series Switches Memory Corruption Vulnerability
Priority: High
Advisory ID: cisco-sa-20190703-sbss-memcorrupt
First Published: 2019 July 3 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds availableCisco Bug IDs: CSCvp43390
CVE-2019-1892
CWE-119
CVSS Score:
7.5 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:X/RL:X/RC:X
Summary
o
A vulnerability in the Secure Sockets Layer (SSL) input packet processor of
Cisco Small Business 200, 300, and 500 Series Managed Switches could allow
an unauthenticated, remote attacker to cause a memory corruption on an
affected device.
The vulnerability is due to improper validation of HTTPS packets. An
attacker could exploit this vulnerability by sending a malformed HTTPS
packet to the management web interface of the affected device. A successful
exploit could allow the attacker to cause an unexpected reload of the
device, resulting in a denial of service (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-20190703-sbss-memcorrupt
Affected Products
o Vulnerable Products
This vulnerability affects Cisco Small Business 200, 300, and 500 Series
Managed Switches running software releases prior to 1.4.10.6 with the
management web interface configured to allow HTTPS. This is enabled by
default.
To determine whether the web interface is configured for HTTPS,
administrators can log in to the web interface of the device and navigate
to Security > TCP/UDP Services . The value in the HTTPS Service field
indicates whether the feature is enabled or disabled.
Refer to the Cisco product release notes for the complete list of
vulnerable product models:
Release Notes for 200, 300, and 500 Series Switches .
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory
are known to be affected by this vulnerability.
Cisco has confirmed that this vulnerability does not affect the following
Cisco products:
Small Business 250, 350, 550 Series Switches
Small Business 220 Series Smart Switches
ESW2 Series Managed Switches
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 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.
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
This vulnerability is fixed in Software Releases 1.4.10.6 and later.
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-20190703-sbss-memcorrupt
Revision History
o +---------+---------------------------+---------+--------+---------------+
| Version | Description | Section | Status | Date |
+---------+---------------------------+---------+--------+---------------+
| 1.0 | Initial public release. | - | Final | 2019-July-03 |
+---------+---------------------------+---------+--------+---------------+
- --------------------------END INCLUDED TEXT--------------------
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