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AUSCERT External Security Bulletin Redistribution
ESB-2022.5208.2
Cisco Identity Services Engine Cross-Site Scripting Vulnerability
15 November 2022
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Identity Services Engine Cross-Site Scripting
Publisher: Cisco Systems
Operating System: Cisco
Resolution: Patch/Upgrade
CVE Names: CVE-2022-20959
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ise-xss-twLnpy3M
Comment: CVSS (Max): 6.1 CVE-2022-20959 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N)
CVSS Source: Cisco Systems
Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Revision History: November 15 2022: Vendor updated advisory
October 20 2022: Initial Release
- --------------------------BEGIN INCLUDED TEXT--------------------
Cisco Identity Services Engine Cross-Site Scripting Vulnerability
Priority: Medium
Advisory ID: cisco-sa-ise-xss-twLnpy3M
First Published: 2022 October 19 16:00 GMT
Last Updated: 2022 November 14 20:04 GMT
Version 1.2: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCwc62413
CVE Names: CVE-2022-20959
CWEs: CWE-79
Summary
o A vulnerability in the External RESTful Services (ERS) API of Cisco
Identity Services Engine (ISE) Software could allow an authenticated,
remote attacker to conduct a cross-site scripting (XSS) attack against a
user of the interface of an affected device.
This vulnerability is due to insufficient input validation. An attacker
could exploit this vulnerability by persuading an authenticated
administrator of the web-based management interface to click a malicious
link. 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.
This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ise-xss-twLnpy3M
Affected Products
o Vulnerable Products
At the time of publication, this vulnerability affected Cisco ISE Software
if ERS was enabled.
For information about which Cisco software releases were vulnerable at the
time of publication, see the Fixed Software section of this advisory. See
the Details section in the bug ID(s) at the top of this advisory for the
most complete and current information.
Determine Whether ERS is Enabled
For Cisco ISE releases 2.0 to 2.7, do the following:
1. Log in to the Cisco ISE web management interface.
2. Choose Administration > System > Settings .
3. Choose ERS Settings .
If Enable ERS for Read/Write is selected, the device is vulnerable.
If Disable ERS is selected, the device is not vulnerable.
For Cisco ISE Release 3.0, do the following:
1. Log in to the Cisco ISE web management interface.
2. Click the menu icon.
3. Choose Administration > System > Settings .
4. Choose ERS Settings .
If Enable ERS for Read/Write is selected, the device is vulnerable.
If Disable ERS is selected, the device is not vulnerable.
For Cisco ISE releases 3.1 and 3.2, do the following:
1. Log in to the Cisco ISE web management interface.
2. Click the menu icon.
3. Choose Administration > System > Settings .
4. Choose API Settings .
5. Choose the API Service Settings tab.
If ERS (Read/Write) is selected, the device is vulnerable.
If ERS (Read/Write) is not selected, the device is not vulnerable.
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. However,
administrators may disable the affected feature.
To disable ERS in Cisco ISE releases 2.0 to 2.7, do the following:
1. Log in to the Cisco ISE web management interface.
2. Choose Administration > System > Settings .
3. Choose ERS Settings .
4. Click the Disable ERS radio button.
To disable ERS in Cisco ISE Release 3.0, do the following:
1. Log in to the Cisco ISE web management interface.
2. Click the menu icon.
3. Choose Administration > System > Settings .
4. Click the Disable ERS radio button.
To disable ERS in Cisco ISE releases 3.1 and 3.2, do the following:
1. Log in to the Cisco ISE web management interface.
2. Click the menu icon.
3. Choose Administration > System > Settings .
4. Choose API Settings .
5. Choose the API Service Settings tab.
6. Click the ERS (Read/Write) toggle switch to deactivate it.
While this mitigation has been deployed and was proven successful in a test
environment, customers should determine the applicability and effectiveness
in their own environment and under their own use conditions. Customers
should be aware that any workaround or mitigation that is implemented may
negatively impact the functionality or performance of their network based
on intrinsic customer deployment scenarios and limitations. Customers
should not deploy any workarounds or mitigations before first evaluating
the applicability to their own environment and any impact to such
environment.
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 vulnerability that is
described in this advisory and which release included the fix for this
vulnerability.
Cisco ISE Software Release First Fixed Release
2.4 ^1 and earlier Migrate to fixed release.
2.6 ^2 Migrate to fixed release.
2.7 ^2 2.7P8 (Nov 2022)
3.0 ^2 3.0P7 (Feb 2023)
3.1 3.1P4
3.2 ^2 3.2P1 (Jan 2023)
1. Cisco ISE Software Release 2.4 has reached End of Software Maintenance .
Customers are advised to migrate to a supported release that includes the
fix for this vulnerability.
2. Hot patches are available by request for the following versions and
patch levels: 2.6P12, 2.7P7, 3.0P6, and 3.2. Contact Cisco TAC to make the
request.
For instructions on upgrading your device, see the Upgrade Guides located
on the Cisco Identity Service Engine support page.
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 aware that proof-of-concept exploit code for the
vulnerability that is described in this advisory will become available
after software fixes are released. Public reports of the vulnerability,
including a description and classification without specific technical
details, will become available after this advisory is published.
The Cisco PSIRT is not aware of any malicious use of the vulnerability that
is described in this advisory.
Source
o Cisco would like to thank Davide Virruso of Yoroi for reporting this
vulnerability.
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.
Related to This Advisory
o Cross-Site Scripting
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ise-xss-twLnpy3M
Revision History
o +---------+--------------------------+-------------+--------+-------------+
| Version | Description | Section | Status | Date |
+---------+--------------------------+-------------+--------+-------------+
| 1.2 | Updated hot patch | Fixed | Final | 2022-NOV-14 |
| | information. | Releases | | |
+---------+--------------------------+-------------+--------+-------------+
| | Added mitigation | Workarounds | | |
| 1.1 | information. Updated | and Fixed | Final | 2022-OCT-31 |
| | expected release date | Releases | | |
| | for 2.7P8. | | | |
+---------+--------------------------+-------------+--------+-------------+
| 1.0 | Initial public release. | - | Final | 2022-OCT-19 |
+---------+--------------------------+-------------+--------+-------------+
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