PT-2019-19890 · Madskristensen · Miniblog

Published 2019-06-14 · Updated 2019-06-19 · CVE-2019-9842

Positive Technologies (AI Summary)

CVSS v3.1

7.2

High

Base vector

AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions madskristensen MiniBlog through 2018-05-18

Description The issue allows remote attackers to execute arbitrary ASPX code via an IMG element with a data: URL. This is because the SaveFilesToDisk function in app code/handlers/PostHandler.cs writes a decoded base64 string to a file without validating the extension.

Recommendations For madskristensen MiniBlog through 2018-05-18, consider validating file extensions before writing decoded base64 strings to disk to prevent arbitrary ASPX code execution. As a temporary workaround, restrict the ability to upload or save files with potentially dangerous extensions.

Exploit

Fix

Unrestricted File Upload

Weakness Enumeration

CWE-434

Related Identifiers

CVE-2019-9842

Affected Products

Miniblog

References · 4

• 🔥 https://rastating.github.io/miniblog-remote-code-execution · Exploit
• https://osv.dev/vulnerability/CVE-2019-9842 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2019-9842 · Security Note
• https://github.com/madskristensen/MiniBlog/blob/1a7ae45ddba484e2c8f808e288e018748c9ddb57/Website/app_code/handlers/PostHandler.cs#L85 · Note