PT-2021-5204 · D Link · D-Link Dir-809

Ainevsia + 2 · Published 2021-01-12 · Updated 2021-12-02 · CVE-2021-33265

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 The issue is related to a stack buffer overflow vulnerability in the function FUN 80046eb4 in the /formSetPortTr endpoint. This vulnerability 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 the FUN 80046eb4 function in the /formSetPortTr endpoint as a temporary workaround until a patch is available. Restrict access to the /formSetPortTr 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:2021-06006

CVE-2021-33265

Affected Products

D-Link Dir-809

References · 7

• 🔥 https://github.com/Lnkvct/IoT-poc/tree/master/D-Link-DIR809/vuln05 · Exploit
• https://dlink.com/en/security-bulletin · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-33265 · Security Note
• https://osv.dev/vulnerability/CVE-2021-33265 · Vendor Advisory
• https://bdu.fstec.ru/vul/2021-06006 · Security Note
• https://t.me/cibsecurity/33236 · Telegram Post
• https://t.me/cvenotify/24108 · Telegram Post