PT-2021-5507 · D Link · Dir-809

Lnkvct + 2 · Published 2021-01-12 · Updated 2021-12-03 · CVE-2021-33269

Positive Technologies (AI Summary)

CVSS v3.1

10

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-809 versions through DIR-809Ax FW1.12WWB03 20190410

Description The issue is related to a stack buffer overflow vulnerability in the function FUN 8004776c, located in the /formVirtualServ endpoint. This vulnerability can be triggered via a crafted POST request to the "/formVirtualServ" endpoint, allowing a remote attacker to execute arbitrary code in the system.

Recommendations For versions through DIR-809Ax FW1.12WWB03 20190410, as a temporary workaround, consider disabling the FUN 8004776c function in the /formVirtualServ endpoint until a patch is available. Restrict access to the /formVirtualServ endpoint to minimize the risk of exploitation. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Memory Corruption

Weakness Enumeration

CWE-787

Related Identifiers

BDU:2021-06357

BDU:2022-00012

CVE-2021-33269

Affected Products

Dir-809

References · 7

• 🔥 https://github.com/Lnkvct/IoT-poc/tree/master/D-Link-DIR809/vuln01 · Exploit
• https://dlink.com/en/security-bulletin · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-33269 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-33269 · Security Note
• https://bdu.fstec.ru/vul/2021-06357 · Security Note
• https://bdu.fstec.ru/vul/2022-00012 · Security Note
• https://t.me/cibsecurity/33240 · Telegram Post