PT-2021-22599 · D Link · D-Link Dir-816

Doudoudedi · Published 2021-08-24 · Updated 2021-09-01 · CVE-2021-39509

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: D-Link DIR-816 version DIR-816A2 FWv1.10CNB05 R1B011D88210

Description: An issue was discovered where the HTTP request parameter is used in the handler function of the "/goform/form2userconfig.cgi" route. This allows constructing the user name string to delete the user function, leading to command injection through shell metacharacters.

Recommendations: For D-Link DIR-816 version DIR-816A2 FWv1.10CNB05 R1B011D88210, as a temporary workaround, consider restricting access to the "/goform/form2userconfig.cgi" route until a patch is available. Avoid using the username parameter in the affected API endpoint until the issue is resolved. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Command Injection

Weakness Enumeration

CWE-77

Related Identifiers

CVE-2021-39509

Affected Products

D-Link Dir-816

References · 6

• 🔥 https://github.com/doudoudedi/main-DIR-816_A2_Command-injection/blob/main/injection.md · Exploit
• https://osv.dev/vulnerability/CVE-2021-39509 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-39509 · Security Note
• https://dlink.com/en/security-bulletin · Vendor Advisory
• https://github.com/doudoudedi/main-DIR-816_A2_Command-injection · Note
• https://t.me/cvenotify/20483 · Telegram Post