Cross-site scripting in python-markdown2 package

1) Cross-site scripting

EUVDB-ID: #VU28002

Risk: Low

CVSSv3.1: 5.3 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: N/A

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 "link text". 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

python-markdown2: 1.0.1.17 - 2.3.8

External links

http://snyk.io/vuln/SNYK-PYTHON-MARKDOWN2-568905
http://github.com/trentm/python-markdown2/pull/350/commits/5db3e6e92a51ad8a98c73411962ecbe96c9a737e
http://github.com/trentm/python-markdown2/issues/341
http://github.com/trentm/python-markdown2/pull/350

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.