Cisco Adaptive Security Appliance WebVPN Cross-Site Scripting

Authors:Cisco                 Risk:Medium

CVE:CVE-2018-0242            0day:Cross-Site Scripting

0day-id:0DAY-0240             Date:2018-04-22

Summary

A vulnerability in the Login screen of the Clientless SSL VPN (WebVPN) portal of Cisco Adaptive Security Appliance (ASA) 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.

There are no workarounds that address this vulnerability.

Affected Products

Vulnerable Products
This vulnerability affects Cisco Adaptive Security Appliance. For information about affected software releases, consult the Cisco bug ID(s) at the top of this advisory.

Products Confirmed Not Vulnerable

No other Cisco products are currently known to be affected by this vulnerability.

Workarounds

  • There are no workarounds that address this vulnerability.

Fixed Software

  • For information about fixed software releases, consult the Cisco bug ID(s) at the top of this advisory.

    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.

Exploitation and Public Announcements

  • 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.

Source

  • This vulnerability was found during the resolution of a Cisco TAC support case.

    Revision History

    Version Description Section Status Date
    1.1 Reworded the summary to make it clear that only the Clientless SSL VPN portal’s Login screen is affected. Summary Final 2018-April-19
    1.0 Initial public release. Final 2018-April-18

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