PT-2020-6515 · D Link · D-Link Dap-2020

Chitran + 2 · Published 2020-03-12 · Updated 2023-04-26 · CVE-2021-34861

Positive Technologies (AI Summary)

CVSS v3.1

8.8

High

Base vector

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

Name of the Vulnerable Software and Affected Versions D-Link DAP-2020 version 1.01rc001

Description This issue allows network-adjacent attackers to execute arbitrary code on affected installations of D-Link DAP-2020 routers. Authentication is not required to exploit this issue. The specific flaw exists within the "webproc" endpoint, which listens on TCP port 80 by default. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this issue to execute code in the context of root.

Recommendations For D-Link DAP-2020 version 1.01rc001, as a temporary workaround, consider disabling the "webproc" endpoint until a patch is available. Restrict access to the "webproc" endpoint to minimize the risk of exploitation. Avoid using the vulnerable endpoint until the issue is resolved. At the moment, there is no information about a newer version that contains a fix for this issue.

Fix

Stack Overflow

Weakness Enumeration

CWE-121

Related Identifiers

BDU:2021-05770

CVE-2021-34861

ZDI-21-977

Affected Products

D-Link Dap-2020

References · 7

• https://supportannouncement.us.dlink.com/announcement/publication.aspx?name=SAP10201 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-34861 · Vendor Advisory
• https://zerodayinitiative.com/advisories/ZDI-21-977 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2021-34861 · Security Note
• https://bdu.fstec.ru/vul/2021-05770 · Security Note
• https://t.me/cvenotify/49124 · Telegram Post
• https://t.me/cibsecurity/31163 · Telegram Post