A vulnerability was found in Markdown Preview Plus Extension up to 0.5.6 on Chrome and classified as problematic. This issue affects an unknown functionality. The manipulation with an unknown input leads to a cross site scripting vulnerability. Using CWE to declare the problem leads to CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. Impacted is integrity. The summary by CVE is:

Cross-site scripting (XSS) vulnerability in the Markdown Preview Plus extension before 0.5.7 for Chrome allows remote attackers to inject arbitrary web script or HTML into some web applications via the upload and display of crafted text, markdown, or rst files that are designed to be viewed in the browser as plain text, but that will be converted to HTML without proper sanitization.

The bug was discovered 03/05/2017. The weakness was released 07/24/2017 (GitHub Repository). The advisory is shared at github.com. The identification of this vulnerability is CVE-2017-11593 since 07/23/2017. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1059.007 for this issue.

The vulnerability was handled as a non-public zero-day exploit for at least 140 days. During that time the estimated underground price was around $0-$5k.

Upgrading to version 0.5.7 eliminates this vulnerability.

Productinfo

Name

• Markdown Preview Plus Extension

Version

• 0.5.0
• 0.5.1
• 0.5.2
• 0.5.3
• 0.5.4
• 0.5.5
• 0.5.6

License

• open-source

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