Summary

• Multiple vulnerabilities in the web-based management interface of Cisco Identity Services Engine (ISE) Software could allow an attacker to conduct a cross-site scripting (XSS) attack against a user of the 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-ise-xss1-rgxYry2V

Affected Products

• Vulnerable Products

  These vulnerabilities affect Cisco ISE Software.

  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.

Details

• 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-2021-34738: Cisco ISE Cross-Site Scripting Vulnerability

  A vulnerability in the web-based management interface of Cisco ISE Software could allow an unauthenticated, remote attacker to conduct an XSS attack against a user of the web-based management interface on an affected device.

  This vulnerability is due to improper validation of user-supplied input in the web-based management interface. An attacker could exploit this vulnerability by persuading a user to upload a file that contains a malicious payload to the affected device. A successful exploit could allow the attacker to execute arbitrary script code in the context of the affected interface or access sensitive, browser-based information.

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

  Bug ID(s): CSCvy81868
  CVE ID: CVE-2021-34738
  Security Impact Rating (SIR): Medium
  CVSS Base Score: 6.1
  CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

  CVE-2021-40121: Cisco ISE Cross-Site Scripting Vulnerability

  A vulnerability in the web-based management interface of Cisco ISE Software could allow an authenticated, remote attacker with administrative credentials to conduct an XSS attack against a user of the interface.

  This vulnerability is due to improper validation of user-supplied input in the web-based management interface. An attacker could exploit this vulnerability by injecting malicious code into specific pages of the interface. A successful exploit could allow the attacker to execute arbitrary script code in the context of the interface or access sensitive, browser-based information. To exploit this vulnerability, an attacker would need valid administrative credentials.

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

  Bug ID(s): CSCvy11971
  CVE ID: CVE-2021-40121
  Security Impact Rating (SIR): Medium
  CVSS Base Score: 4.8
  CVSS Vector:  CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

Workarounds

• There are no workarounds that address these vulnerabilities.

Fixed Software

• 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 two columns indicate whether a release was affected by the vulnerabilities described in this advisory and which releases included the fixes for these vulnerabilities.

  Cisco ISE Release	CVE-2021-34738 (CSCvy81868)	CVE-2021-40121 (CSCvy11971)
  All versions earlier than 2.4	Migrate to a fixed release.	Migrate to a fixed release.
  2.4	Migrate to a fixed release.	2.4P14 confirmed not vulnerable.
  2.6	2.6 P10	2.6 P10
  2.7	2.7 P5	2.7 P5
  3.0	3.0 P4	3.0 P3
  3.1	Not vulnerable.	Not vulnerable.

  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 not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.

Source

• Cisco would like to thank Rithin Uppal of Visa for reporting the vulnerability associated with CVE-2021-34738.

  Cisco would like to thank Alexander Polce Leary of AIG for reporting the vulnerability associated with CVE-2021-40121.

URL

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ise-xss1-rgxYry2V

Revision History

• Version	Description	Section	Status	Date
  1.1	Removed ISE 2.4P14 as a vulnerable version for CSCvy11971.	Fixed Releases	Final	2021-NOV-12
  1.0	Initial public release.	—	Final	2021-OCT-20

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