Cross-site scripting in Werkzeug

1) Cross-site scripting

EUVDB-ID: #VU31406

Risk: Low

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:Clear]

CVE-ID: CVE-2016-10516

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

Exploit availability: No

Description

Vulnerability allows a remote attacker to perform Cross-site scripting attacks.

An input validation error exists in the render_full function in debug/tbtools.py in the debugger in Pallets Werkzeug before 0.11.11 (as used in Pallets Flask and other products). A remote authenticated attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in victim's browser in security 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

Update to version 0.11.11.

Vulnerable software versions

Werkzeug: 0.11.1 - 0.11.10

CPE2.3

• cpe:2.3:a:palletsprojects:werkzeug:0.11.1:*:*:*:*:*:*:*
• cpe:2.3:a:palletsprojects:werkzeug:0.11.2:*:*:*:*:*:*:*
• cpe:2.3:a:palletsprojects:werkzeug:0.11.3:*:*:*:*:*:*:*

External links

https://blog.neargle.com/2016/09/21/flask-src-review-get-a-xss-from-debuger/
https://github.com/pallets/werkzeug/pull/1001
https://lists.debian.org/debian-lts-announce/2017/11/msg00037.html

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.