Summary

• Multiple vulnerabilities in the web-based user interface of certain Cisco Small Business Series Switches could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition or execute arbitrary code with root privileges on an affected device. These vulnerabilities are due to improper validation of requests that are sent to the web interface.

  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://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sg-web-multi-S9g4Nkgv

Affected Products

• Vulnerable Products

  These vulnerabilities affect the following Cisco Small Business Switches if they are running a vulnerable firmware release:

  • 250 Series Smart Switches
  • 350 Series Managed Switches
  • 350X Series Stackable Managed Switches
  • 550X Series Stackable Managed Switches
  • Business 250 Series Smart Switches
  • Business 350 Series 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 these vulnerabilities.

  Cisco has confirmed that these vulnerabilities do not affect the following Cisco products:

  • 220 Series Smart Switches
  • Business 220 Series Smart Switches

Details

• The vulnerabilities are not dependent on one another. Exploitation of one of the vulnerabilities is not required to exploit another vulnerability. In addition, a software release that is affected by one of the vulnerabilities may not be affected by the other vulnerabilities.

  Details about the vulnerabilities are as follows:

  CVE-2023-20159: Cisco Small Business Series Switches Stack Buffer Overflow Vulnerability

  A vulnerability in the web-based user interface of Cisco Small Business Series Switches could allow an unauthenticated, remote attacker to execute arbitrary code on an affected device.

  This vulnerability is due to improper validation of requests that are sent to the web interface. An attacker could exploit this vulnerability by sending a crafted request through the web-based user interface. A successful exploit could allow the attacker to execute arbitrary code with root privileges on an affected device.

  Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

  Bug ID(s): CSCwe27425, CSCwe32323
  CVE ID: CVE-2023-20159
  Security Impact Rating (SIR): Critical
  CVSS Base Score: 9.8
  CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

  CVE-2023-20160: Cisco Small Business Series Switches Unauthenticated BSS Buffer Overflow Vulnerability

  A vulnerability in the web-based user interface of Cisco Small Business Series Switches could allow an unauthenticated, remote attacker to execute arbitrary code on an affected device.

  This vulnerability is due to improper validation of requests that are sent to the web interface. An attacker could exploit this vulnerability by sending a crafted request through the web-based user interface. A successful exploit could allow the attacker to execute arbitrary code with root privileges on an affected device.

  Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

  Bug ID(s): CSCwe27441, CSCwe32326
  CVE ID: CVE-2023-20160
  Security Impact Rating (SIR): Critical
  CVSS Base Score: 9.8
  CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

  CVE-2023-20161: Cisco Small Business Series Switches Unauthenticated Stack Buffer Overflow Vulnerability

  A vulnerability in the web-based user interface of Cisco Small Business Series Switches could allow an unauthenticated, remote attacker to execute arbitrary code on an affected device.

  This vulnerability is due to improper validation of requests that are sent to the web interface. An attacker could exploit this vulnerability by sending a crafted request through the web-based user interface. A successful exploit could allow the attacker to execute arbitrary code with root privileges on an affected device.

  Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

  Bug ID(s): CSCwe27444, CSCwe32334
  CVE ID: CVE-2023-20161
  Security Impact Rating (SIR): Critical
  CVSS Base Score: 9.8
  CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

  CVE-2023-20189: Cisco Small Business Series Switches Unauthenticated Stack Buffer Overflow Vulnerability

  A vulnerability in the web-based user interface of Cisco Small Business Series Switches could allow an unauthenticated, remote attacker to execute arbitrary code on an affected device.

  This vulnerability is due to improper validation of requests that are sent to the web interface. An attacker could exploit this vulnerability by sending a crafted request through the web-based user interface. A successful exploit could allow the attacker to execute arbitrary code with root privileges on an affected device.

  Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

  Bug ID(s): CSCwe27424, CSCwe32321
  CVE ID: CVE-2023-20189
  Security Impact Rating (SIR): Critical
  CVSS Base Score: 9.8
  CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

  CVE-2023-20024: Cisco Small Business Series Switches Unauthenticated Heap Buffer Overflow Vulnerability

  A vulnerability in the web-based user interface of Cisco Small Business Series Switches could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.

  This vulnerability is due to improper validation of requests that are sent to the web interface. An attacker could exploit this vulnerability by sending a crafted request through the web-based user interface. A successful exploit could allow the attacker to cause a DoS condition on an affected device.

  Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

  Bug ID(s): CSCwe27386, CSCwe32312
  CVE ID: CVE-2023-20024
  Security Impact Rating (SIR): High
  CVSS Base Score: 8.6
  CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

  CVE-2023-20156: Cisco Small Business Series Switches Unauthenticated Heap Buffer Overflow Vulnerability
  

  A vulnerability in the web-based user interface of Cisco Small Business Series Switches could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.

  This vulnerability is due to improper validation of requests that are sent to the web interface. An attacker could exploit this vulnerability by sending a crafted request through the web-based user interface. A successful exploit could allow the attacker to cause a DoS condition on an affected device.

  Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

  Bug ID(s): CSCwe27393, CSCwe32313
  CVE ID: CVE-2023-20156
  Security Impact Rating (SIR): High
  CVSS Base Score: 8.6
  CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

  CVE-2023-20157: Cisco Small Business Series Switches Unauthenticated Heap Buffer Overflow Vulnerability

  A vulnerability in the web-based user interface of Cisco Small Business Series Switches could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.

  This vulnerability is due to improper validation of requests that are sent to the web interface. An attacker could exploit this vulnerability by sending a crafted request through the web-based user interface. A successful exploit could allow the attacker to cause a DoS condition on an affected device.

  Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

  Bug ID(s): CSCwe27394, CSCwe32315
  CVE ID: CVE-2023-20157
  Security Impact Rating (SIR): High
  CVSS Base Score: 8.6
  CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

  CVE-2023-20158: Cisco Small Business Series Switches Unauthenticated Denial-of-Service Vulnerability

  A vulnerability in the web-based user interface of Cisco Small Business Series Switches could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.

  This vulnerability is due to improper validation of requests that are sent to the web interface. An attacker could exploit this vulnerability by sending a crafted request through the web-based user interface. A successful exploit could allow the attacker to cause a DoS condition on an affected device.

  Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

  Bug ID(s): CSCwe27403, CSCwe32318
  CVE ID: CVE-2023-20158
  Security Impact Rating (SIR): High
  CVSS Base Score: 8.6
  CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

  CVE-2023-20162: Cisco Small Business Series Switches Unauthenticated Configuration Reading Vulnerability

  A vulnerability in the web-based user interface of Cisco Small Business Series Switches could allow an unauthenticated, remote attacker to read unauthorized information on an affected device.

  This vulnerability is due to improper validation of requests that are sent to the web interface. An attacker could exploit this vulnerability by sending a crafted request through the web-based interface. A successful exploit could allow the attacker to read unauthorized information on an affected device.

  Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

  Bug ID(s): CSCwe27445, CSCwe32338
  CVE ID: CVE-2023-20162
  Security Impact Rating (SIR): High
  CVSS Base Score: 7.5
  CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Workarounds

• There are no workarounds that address these vulnerabilities.

Fixed Software

• Cisco has released free software updates that address the vulnerabilities described in this advisory. Customers with service contracts that entitle them to regular software updates should obtain security fixes through their usual update channels.

  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.

  The Cisco Support and Downloads page on Cisco.com provides information about licensing and downloads. This page can also display customer device support coverage for customers who use the My Devices tool.

  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

  In the following tables, the left column lists Cisco software releases. The right column indicates whether a release is affected by the vulnerabilities that are described in this advisory and the first release that includes the fix for these vulnerabilities. Customers are advised to upgrade to an appropriate fixed software release as indicated in this section.

  250 Series Smart Switches, 350 Series Managed Switches, 350X Series Stackable Managed Switches, and 550X Series Stackable Managed Switches

  Cisco Firmware Release	First Fixed Release
  2.5.9.15 and earlier	2.5.9.16

  Business 250 Series Smart Switches and Business 350 Series Managed Switches

  Cisco Firmware Release	First Fixed Release
  3.3.0.15 and earlier	3.3.0.16

  To download the firmware from the Software Center on Cisco.com, click Browse all and choose Switches > LAN Switches - Small Business.

  Small Business 200 Series Smart Switches, Small Business 300 Series Managed Switches, Small Business 500 Series Stackable Managed Switches

  Cisco has not and will not release firmware updates to address the vulnerabilities described in this advisory for these devices. The Cisco Small Business 200 Series Smart Switches, Small Business 300 Series Managed Switches, and Small Business 500 Series Stackable Managed Switches have entered the end-of-life process. Customers are advised to refer to the end-of-life notices for these products:

  End-of-Sale and End-of-Life Announcement for the Cisco Small Business 200 Series Smart Switches

  End-of-Sale and End-of-Life Announcement for the Cisco Small Business 300 Series Managed Switches

  End-of-Sale and End-of-Life Announcement for the Small Business 500 Series Stackable Managed Switches

  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

• The Cisco PSIRT is aware that proof-of-concept exploit code is available for the vulnerabilities that are described in this advisory.

  The Cisco PSIRT is not aware of any malicious use of the vulnerabilities that are described in this advisory.

Source

• Cisco would like to thank the external researcher who reported these vulnerabilities.

URL

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sg-web-multi-S9g4Nkgv

Revision History

• Version	Description	Section	Status	Date
  1.0	Initial public release.	-	Final	2023-MAY-17

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