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AUSCERT External Security Bulletin Redistribution
ESB-2021.3312
Cisco Business 220 Series Smart Switches Static Key and
Password Vulnerabilities
7 October 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Business 220 Series Smart Switches
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Access Privileged Data -- Console/Physical
Reduced Security -- Console/Physical
Resolution: Patch/Upgrade
CVE Names: CVE-2021-34757 CVE-2021-34744
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sb-hardcoded-cred-MJCEXvX
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Cisco Business 220 Series Smart Switches Static Key and Password
Vulnerabilities
Priority: Medium
Advisory ID: cisco-sa-sb-hardcoded-cred-MJCEXvX
First Published: 2021 October 6 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvy90709 CSCvy90713
CVE Names: CVE-2021-34744 CVE-2021-34757
CWEs: CWE-540
Summary
o Multiple vulnerabilities in Cisco Business 220 Series Smart Switches
firmware could allow an attacker with Administrator privileges to access
sensitive login credentials or reconfigure the passwords on the user
account.
For more information about these vulnerabilities, see the Details section
of this advisory.
Cisco has released software updates that address these vulnerabilities.
There are no workarounds that address these vulnerabilities.
This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sb-hardcoded-cred-MJCEXvX
Affected Products
o Vulnerable Products
At the time of publication, these vulnerabilities affected Cisco Business
220 Series Smart Switches if they were running a vulnerable firmware
release and had the web-based management interface enabled. The web-based
management interface is enabled through both HTTP and HTTPS by default.
Determine the Device Configuration
To determine whether the web-based management interface is enabled through
either HTTP or HTTPS, use the show running-config command on the device
CLI. If both of the following lines are present in the configuration, the
web-based management interface is disabled and the device is not affected:
no ip http server
no ip http secure server
Any other output indicates that the web-based management interface is
enabled on the device.
In the web-based 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 these vulnerabilities.
Details
o The vulnerabilities are not dependent on one another. Exploitation of one
of the vulnerabilities is not required to exploit the other vulnerability.
In addition, a software release that is affected by one of the
vulnerabilities may not be affected by the other vulnerability.
Details about the vulnerabilities are as follows:
CVE-2021-34757: Cisco Business 220 Series Static Password Vulnerability
A vulnerability in Cisco Business 220 Series Smart Switches firmware could
allow an authenticated, physical attacker to obtain higher privileges on an
affected device.
This vulnerability is due to the use of a static password in all Cisco
Business 220 Series Smart Switches firmware. An attacker with Administrator
privileges could exploit this vulnerability by logging in to a serial
interface and accessing encoded passwords. A successful exploit could allow
the attacker to obtain and reconfigure user account passwords.
Cisco has released software updates that address this vulnerability. There
are no workarounds that address this vulnerability.
Bug ID(s): CSCvy90709
CVE ID: CVE-2021-34757
Security Impact Rating (SIR): Medium
CVSS Base Score: 5.5
CVSS Vector: CVSS:3.1/AV:P/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N
CVE-2021-34744: Cisco Business 220 Series Static Key Vulnerability
A vulnerability in Cisco Business 220 Series Smart Switches firmware could
allow an authenticated, remote attacker to access sensitive information on
an affected device.
This vulnerability is due to the use of a static cryptographic key in all
Cisco Business 220 Series Smart Switches firmware images. An attacker with
Administrator privileges could exploit this vulnerability by logging in to
the web-based management interface and accessing encrypted passwords. A
successful exploit could allow the attacker to obtain sensitive login
credentials for other applications.
Cisco has released software updates that address this vulnerability. There
are no workarounds that address this vulnerability.
Bug ID(s): CSCvy90713
CVE ID: CVE-2021-34744
Security Impact Rating (SIR): Medium
CVSS Base Score: 4.9
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
Workarounds
o There are no workarounds that address these vulnerabilities.
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 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, the release information in the following table
(s) was accurate. See the Details section in the bug ID(s) at the top of
this advisory for the most complete and current information.
The left column lists Cisco software releases, and the right column
indicates whether a release was affected by the vulnerabilities described
in this advisory and which release included the fix for these
vulnerabilities.
Cisco Business 220 Series Smart Switches Firmware First Fixed
Release Release
1.2.0.6 and earlier 1.2.1.2
The Cisco Product Security Incident Response Team (PSIRT) validates only
the affected and fixed release information that is documented in this
advisory.
Exploitation and Public Announcements
o The Cisco PSIRT is not aware of any public announcements or malicious use
of the vulnerabilities that are described in this advisory.
Source
o Cisco would like to thank security researcher Jasper Lievisse Adriaanse for
reporting these vulnerabilities.
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-sb-hardcoded-cred-MJCEXvX
Revision History
o +----------+---------------------------+----------+--------+--------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+--------------+
| 1.0 | Initial public release. | - | Final | 2021-OCT-06 |
+----------+---------------------------+----------+--------+--------------+
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