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AUSCERT External Security Bulletin Redistribution
ESB-2019.2960.2
Cisco Small Business 220 Series Smart Switches Multiple Vulnerabilities
22 August 2019
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco 220 Series Smart Switches
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Root Compromise -- Remote/Unauthenticated
Create Arbitrary Files -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2019-1914 CVE-2019-1913 CVE-2019-1912
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190806-sb220-rce
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190806-sb220-inject
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190806-sb220-auth_bypass
Comment: This bulletin contains three (3) Cisco Systems security advisories.
Revision History: August 22 2019: Added updated advisory 1.1
August 7 2019: Initial Release
- --------------------------BEGIN INCLUDED TEXT--------------------
Cisco Small Business 220 Series Smart Switches Remote Code Execution
Vulnerabilities
Priority: Critical
Advisory ID: cisco-sa-20190806-sb220-rce
First Published: 2019 August 6 14:00 GMT
Last Updated: 2019 August 21 14:27 GMT
Version 1.1: Final
Workarounds: No workarounds availableCisco Bug IDs: CSCvo78320
CVE-2019-1913
CWE-119
CVSS Score:
9.8 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:X/RL:X/RC:X
Summary
o Multiple vulnerabilities in the web management interface of Cisco Small
Business 220 Series Smart Switches could allow an unauthenticated, remote
attacker to overflow a buffer, which then allows the execution of arbitrary
code with root privileges on the underlying operating system.
The vulnerabilities are due to insufficient validation of user-supplied
input and improper boundary checks when reading data into an internal
buffer. An attacker could exploit these vulnerabilities by sending
malicious requests to the web management interface of an affected device.
Depending on the configuration of the affected switch, the malicious
requests must be sent via HTTP or HTTPS.
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-20190806-sb220-rce
Affected Products
o Vulnerable Products
This vulnerability affects Cisco Small Business 220 Series Smart Switches
running firmware versions prior to 1.1.4.4 with the web management
interface enabled. The web management interface is enabled via both HTTP
and HTTPS by default.
Determining Whether the Web Management Interface Is Enabled
To determine whether the web management interface is enabled via either
HTTP or HTTPS, administrators can use the show running-config command on
the device CLI. If both of the following lines are present in the
configuration, the web management interface is disabled and the device is
not vulnerable:
no ip http server
no ip http secure server
Any other output indicates that the web management interface is enabled on
the device.
In the web management interface, the HTTP Service and HTTPS Service are
configured under Security > TCP/UDP Service .
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 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
Cisco fixed this vulnerability in Cisco 220 Series Smart Switches Firmware
releases 1.1.4.4 and later.
Exploitation and Public Announcements
o The Cisco Product Security Incident Response Team (PSIRT) is aware of the
existence of public exploit code. Cisco PSIRT is not aware of malicious use
of the vulnerability that is described in this advisory.
Source
o Cisco would like to thank security researcher bashis for reporting this
vulnerability through the VDOO Disclosure Program.
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-20190806-sb220-rce
Revision History
o +---------+---------------------+---------------+--------+----------------+
| Version | Description | Section | Status | Date |
+---------+---------------------+---------------+--------+----------------+
| | Added information | Exploitation | | |
| 1.1 | about the | and Public | Final | 2019-August-21 |
| | availability of | Announcements | | |
| | exploit code. | | | |
+---------+---------------------+---------------+--------+----------------+
| 1.0 | Initial public | - | Final | 2019-August-06 |
| | release. | | | |
+---------+---------------------+---------------+--------+----------------+
- --------------------------------------------------------------------------
Cisco Small Business 220 Series Smart Switches Command Injection Vulnerability
Priority: Medium
Advisory ID: cisco-sa-20190806-sb220-inject
First Published: 2019 August 6 14:00 GMT
Last Updated: 2019 August 21 14:20 GMT
Version 1.1: Final
Workarounds: No workarounds availableCisco Bug IDs: CSCvo66557
CVE-2019-1914
CWE-20
CVSS Score:
7.2 AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:X/RL:X/RC:X
Summary
o A vulnerability in the web management interface of Cisco Small Business 220
Series Smart Switches could allow an authenticated, remote attacker to
perform a command injection attack.
The vulnerability is due to insufficient validation of user-supplied input.
An attacker could exploit this vulnerability by sending a malicious request
to certain parts of the web management interface. To send the malicious
request, the attacker needs a valid login session in the web management
interface as a privilege level 15 user. Depending on the configuration of
the affected switch, the malicious request must be sent via HTTP or HTTPS.
A successful exploit could allow the attacker to execute arbitrary shell
commands with the privileges of the root user.
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-20190806-sb220-inject
Affected Products
o Vulnerable Products
At the time of publication, this vulnerability affected Cisco Small
Business 220 Series Smart Switches running firmware versions prior to
1.1.4.4 with the web management interface enabled. The web management
interface is enabled via both HTTP and HTTPS by default.
See the Details section in the bug ID(s) at the top of this advisory for
the most complete and current information.
Determining Whether the Web Management Interface Is Enabled
To determine whether the web management interface is enabled via either
HTTP or HTTPS, administrators can use the show running-config command on
the device CLI. If both of the following lines are present in the
configuration, the web management interface is disabled and the device is
not vulnerable:
no ip http server
no ip http secure server
Any other output indicates that the web management interface is enabled on
the device.
In the web management interface, the HTTP Service and HTTPS Service are
configured under Security > TCP/UDP Service .
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 220 Series Switches firmware releases
1.1.4.4 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 aware of the
existence of public exploit code. Cisco PSIRT is not aware of malicious use
of the vulnerability that is described in this advisory.
Source
o Cisco would like to thank security researcher bashis for reporting this
vulnerability through the VDOO Disclosure Program.
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-20190806-sb220-inject
Revision History
o +---------+---------------------+---------------+--------+----------------+
| Version | Description | Section | Status | Date |
+---------+---------------------+---------------+--------+----------------+
| | Added information | Exploitation | | |
| 1.1 | about the | and Public | Final | 2019-August-21 |
| | availability of | Announcements | | |
| | exploit code. | | | |
+---------+---------------------+---------------+--------+----------------+
| 1.0 | Initial public | - | Final | 2019-August-06 |
| | release. | | | |
+---------+---------------------+---------------+--------+----------------+
- --------------------------------------------------------------------------
Cisco Small Business 220 Series Smart Switches Authentication Bypass
Vulnerability
Priority: Critical
Advisory ID: cisco-sa-20190806-sb220-auth_bypass
First Published: 2019 August 6 14:00 GMT
Last Updated: 2019 August 21 14:24 GMT
Version 1.1: Final
Workarounds: No workarounds availableCisco Bug IDs: CSCvo78300
CVE-2019-1912
CWE-285
CVSS Score:
9.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H/E:X/RL:X/RC:X
Summary
o A vulnerability in the web management interface of Cisco Small Business 220
Series Smart Switches could allow an unauthenticated, remote attacker to
upload arbitrary files.
The vulnerability is due to incomplete authorization checks in the web
management interface. An attacker could exploit this vulnerability by
sending a malicious request to certain parts of the web management
interface. Depending on the configuration of the affected switch, the
malicious request must be sent via HTTP or HTTPS. A successful exploit
could allow the attacker to modify the configuration of an affected device
or to inject a reverse shell.
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-20190806-sb220-auth_bypass
Affected Products
o Vulnerable Products
This vulnerability affects Cisco Small Business 220 Series Smart Switches
running firmware versions prior to 1.1.4.4 with the web management
interface enabled. The web management interface is enabled via both HTTP
and HTTPS by default.
Determining Whether the Web Management Interface Is Enabled
To determine whether the web management interface is enabled via either
HTTP or HTTPS, administrators can use the show running-config command on
the device CLI. If both of the following lines are present in the
configuration, the web management interface is disabled and the device is
not vulnerable:
no ip http server
no ip http secure server
Any other output indicates that the web management interface is enabled on
the device.
In the web management interface, the HTTP Service and HTTPS Service are
configured under Security > TCP/UDP Service .
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 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
Cisco fixed this vulnerability in Cisco 220 Series Smart Switches Firmware
releases 1.1.4.4 and later.
Exploitation and Public Announcements
o The Cisco Product Security Incident Response Team (PSIRT) is aware of the
existence of public exploit code. Cisco PSIRT is not aware of malicious use
of the vulnerability that is described in this advisory.
Source
o Cisco would like to thank security researcher bashis for reporting this
vulnerability through the VDOO Disclosure Program.
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-20190806-sb220-auth_bypass
Revision History
o +---------+---------------------+---------------+--------+----------------+
| Version | Description | Section | Status | Date |
+---------+---------------------+---------------+--------+----------------+
| | Added information | Exploitation | | |
| 1.1 | about the | and Public | Final | 2019-August-21 |
| | availability of | Announcements | | |
| | exploit code. | | | |
+---------+---------------------+---------------+--------+----------------+
| 1.0 | Initial public | - | Final | 2019-August-06 |
| | release. | | | |
+---------+---------------------+---------------+--------+----------------+
- --------------------------END INCLUDED TEXT--------------------
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