Stored XSS in Active Directory Federation Services

1) Stored Cross-site scripting

EUVDB-ID: #VU15846

Risk: Low

CVSSv3.1: 5.6 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-8547

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Exploit availability: No

Description

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data in Microsoft Active Directory Federation Services (AD FS). A remote authenticated attacker can send a specially crafted request to the affected AD FS server, store XSS payload on it and execute it in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change permissions and delete content.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Windows: 8.1 - 10 1809 10.0.17763.1

Windows Server: 2012 R2 - 2019 1803

CPE2.3

• cpe:2.3:o:microsoft:windows:8.1 RT:*:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows:10 1607:10.0.14393.10:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows:10 1709:10.0.16299.19:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows:10 1803:10.0.17134.48:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows:10 1809:10.0.17763.1:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server:2012 R2:*:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server:2016:10.0.14393.10:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server:2019:10.0.17763.1:*:*:*:*:*:*

External links

http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8547

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.