Remote code execution in Microsoft Visual Studio

1) Cross-site scripting

EUVDB-ID: #VU49403

Risk: Medium

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-26870

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 Cure53 DOMPurify. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code 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 appearance of the web page, perform phishing and drive-by-download attacks.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Visual Studio: 15.0 26228.04 - 16.4.0 16.4.29519.181

CPE2.3

• cpe:2.3:a:microsoft:visual_studio:15.0:26228.04:*:*:*:*:*:*
• cpe:2.3:a:microsoft:visual_studio:15.6.6:*:*:*:*:*:*:*
• cpe:2.3:a:microsoft:visual_studio:15.7.5:*:*:*:*:*:*:*
• cpe:2.3:a:microsoft:visual_studio:15.8:*:*:*:*:*:*:*
• cpe:2.3:a:microsoft:visual_studio:15.9:*:*:*:*:*:*:*
• cpe:2.3:a:microsoft:visual_studio:16.0.0:16.0.28729.10:*:*:*:*:*:*
• cpe:2.3:a:microsoft:visual_studio:16.1.0:16.1.28917.181:*:*:*:*:*:*
• cpe:2.3:a:microsoft:visual_studio:16.2.0:16.2.29123.88:*:*:*:*:*:*
• cpe:2.3:a:microsoft:visual_studio:16.3.0:16.3.29318.209:*:*:*:*:*:*
• cpe:2.3:a:microsoft:visual_studio:16.4.0:16.4.29519.181:*:*:*:*:*:*

External links

https://github.com/cure53/DOMPurify/commit/02724b8eb048dd219d6725b05c3000936f11d62d
https://github.com/cure53/DOMPurify/compare/2.0.16...2.0.17
https://lists.debian.org/debian-lts-announce/2020/10/msg00029.html
https://research.securitum.com/mutation-xss-via-mathml-mutation-dompurify-2-0-17-bypass/

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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