PT-2021-17697 · Sonlogger · Sonlogger

Berkan Erb3R · Published 2021-03-05 · Updated 2025-06-12 · CVE-2021-27964

Positive Technologies (AI Summary)

CVSS v3.1

9.8

Critical

Base vector

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

Name of the Vulnerable Software and Affected Versions: SonLogger versions prior to 6.4.1

Description: The issue allows for Unauthenticated Arbitrary File Upload. An attacker can exploit this by sending a POST request to "/Config/SaveUploadedHotspotLogoFile" without any authentication or session header. There is no check for the file extension or content of the uploaded file.

Recommendations: For versions prior to 6.4.1, update to version 6.4.1 or later to resolve the issue. As a temporary workaround, consider restricting access to the "/Config/SaveUploadedHotspotLogoFile" endpoint until a patch is applied. Additionally, implementing checks for file extensions and content can help minimize the risk of exploitation.

Exploit

Fix

Unrestricted File Upload

Weakness Enumeration

CWE-434

Related Identifiers

CVE-2021-27964

Affected Products

Sonlogger

References · 10

• 🔥 https://github.com/erberkan/SonLogger-vulns · Exploit
• 🔥 https://exploit-db.com/exploits/49651 · Exploit
• 🔥 http://packetstormsecurity.com/files/161793/SonLogger-4.2.3.3-Shell-Upload.html · Exploit
• https://osv.dev/vulnerability/CVE-2021-27964 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-27964 · Security Note
• https://sonlogger.com/releasenotes · Vendor Advisory
• https://t.me/cibsecurity/24493 · Telegram Post
• https://t.me/cvenotify/10914 · Telegram Post
• https://t.me/cybersecuritytechnologies/2858 · Telegram Post
• https://twitter.com/pdnuclei_bot/status/1933056693358776773 · Twitter Post