PT-2021-5582 · D Link · D-Link Dir-809

Lnkvct + 2 · Published 2021-01-12 · Updated 2021-12-03 · CVE-2021-33267

Positive Technologies (AI Summary)

CVSS v2.0

10

Critical

Base vector

AV:N/AC:L/Au:N/C:C/I:C/A:C

Name of the Vulnerable Software and Affected Versions D-Link DIR-809 devices with firmware through DIR-809Ax FW1.12WWB03 20190410

Description A stack buffer overflow issue exists in the function FUN 80034d60 in the /formStaticDHCP endpoint. This issue can be triggered via a crafted POST request, potentially allowing a remote attacker to execute arbitrary code in the system.

Recommendations For D-Link DIR-809 devices with firmware through DIR-809Ax FW1.12WWB03 20190410, consider disabling access to the /formStaticDHCP endpoint until a patch is available. As a temporary workaround, restrict the use of the FUN 80034d60 function to minimize the risk of exploitation. Avoid using the /formStaticDHCP endpoint with crafted POST requests until the issue is resolved.

Exploit

Fix

Memory Corruption

Weakness Enumeration

CWE-787

Related Identifiers

BDU:2022-00012

CVE-2021-33267

Affected Products

D-Link Dir-809

References · 8

• 🔥 https://github.com/Lnkvct/IoT-poc/tree/master/D-Link-DIR809/vuln02 · Exploit
• 🔥 https://github.com/Lnkvct/IoT-poc/tree/master/D-Link-DIR809/vuln01 · Exploit
• https://dlink.com/en/security-bulletin · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-33269 · Security Note
• https://osv.dev/vulnerability/CVE-2021-33267 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-33267 · Security Note
• https://bdu.fstec.ru/vul/2022-00012 · Security Note
• https://t.me/cibsecurity/33237 · Telegram Post