Cisco Security Advisory
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CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:X/RL:X/RC:X
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A vulnerability in the Clientless SSL VPN (WebVPN) portal of Cisco Adaptive Security Appliance (ASA) and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to conduct a cross-site scripting (XSS) attack against a user of the web-based management interface of an affected device.
The vulnerability is due to insufficient validation of user-supplied input by the web-based management interface of an affected device. An attacker could exploit this vulnerability by persuading a user of the interface to click a crafted link. A successful exploit could allow the attacker to execute arbitrary script code in the context of the interface or allow the attacker to 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://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20191002-asa-xss
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Vulnerable Products
This vulnerability affects Cisco products running Cisco ASA Software or FTD Software when configured for WebVPN.
For information about which Cisco ASA Software and FTD Software releases are vulnerable, see the Fixed Software section of this advisory.Determine If WebVPN Is Enabled
To determine if the WebVPN service is enabled on a device, administrators can use the show running-config webvpn privileged EXEC command and refer to the output of the command. The following example shows the output of the command for a device that has the WebVPN service enabled:
ciscoasa# show running-config webvpn
.
.
.
webvpn
enable interface_name
.
.
.Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory are known to be affected by this vulnerability.
Cisco has confirmed that this vulnerability does not affect the following Cisco products:
- Firepower Management Center (FMC)
- Firepower Management Center 1000
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There are no workarounds that address this vulnerability.
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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
In the following table(s), the left column lists releases of Cisco ASA Software, Cisco FMC Software, or Cisco FTD Software. The right column indicates whether a release is affected by the vulnerability described in this advisory and the first release that includes the fix for this vulnerability.
Cisco ASA Software
1. Cisco ASA Software releases 9.5 and earlier, as well as Release 9.7, have reached end of software maintenance. Customers are advised to migrate to a supported release that includes the fix for this vulnerability.Cisco ASA Software Release First Fixed Release for This Vulnerability Earlier than 9.41
Migrate to a fixed release.
9.41 Migrate to a fixed release. 9.51 Migrate to a fixed release.
9.6 9.6.4.31 9.71 Migrate to a fixed release. 9.8 9.8.4.9
9.9 9.9.2.56
9.10 9.10.1.30
9.12 9.12.2.9
9.13 9.13.1 Cisco FTD Software
Cisco FTD Software Release First Fixed Release for This Vulnerability Earlier than 6.1.01 Migrate to a fixed release. 6.1.0 Migrate to a fixed release. 6.2.0 Migrate to a fixed release.
6.2.1 Migrate to a fixed release. 6.2.2 Migrate to a fixed release. 6.2.3 6.2.3.15 6.3.0 6.3.0.5 6.4.0 6.4.0.6 6.5.0 Not vulnerable. 1. Cisco FMC and FTD Software releases 6.0.1 and earlier have reached end of software maintenance. Customers are advised to migrate to a supported release that includes the fix for this vulnerability.
To upgrade to a fixed release of Cisco FTD Software, customers can do one of the following:
- For devices that are managed by using Cisco Firepower Management Center (FMC), use the FMC interface to install the upgrade. After installation is complete, reapply the access control policy.
- For devices that are managed by using Cisco Firepower Device Manager (FDM), use the FDM interface to install the upgrade. After installation is complete, reapply the access control policy.
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The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.
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Cisco would like to thank Qingtang Zheng from CodeSafe Team of Legendsec at Qi'anxin Group for reporting this vulnerability.
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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.
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Show LessVersion Description Section Status Date 1.0 Initial public release. — Final 2019-October-02
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