CVE-2021-34861
D-Link DAP-2020 Stack-Based Buffer Overflow Vulnerability
Description
This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of D-Link DAP-2020 1.01rc001 routers. Authentication is not required to exploit this vulnerability. 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 vulnerability to execute code in the context of root. Was ZDI-CAN-12104.
INFO
Published Date :
Oct. 25, 2021, 5:15 p.m.
Last Modified :
April 26, 2023, 7:27 p.m.
Source :
[email protected]
Remotely Exploitable :
No
Impact Score :
5.9
Exploitability Score :
2.8
Public PoC/Exploit Available at Github
CVE-2021-34861 has a 1 public PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-34861.
| URL | Resource |
|---|---|
| https://supportannouncement.us.dlink.com/announcement/publication.aspx?name=SAP10201 | Patch Vendor Advisory |
| https://www.zerodayinitiative.com/advisories/ZDI-21-977/ | Third Party Advisory VDB Entry |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Changelog CVE-2021-33044,CVE-2021-33045 Identity authentication bypass vulnerability found in some Dahua products CVE-2021-27248,CVE-2021-27249,CVE-2021-27250,CVE-2021-34860,CVE-2021-34861,CVE-2021-34862,CVE-2021-34863 Multiple vulnerabilities in DAP-2020 H/W rev. Ax with F/W v1.01 and below HTTP Path Traversal CVE-2019-7406 RCE vulnerability in TP-Link Wi-Fi Extenders via a malformed user agent field in HTTP headers CVE-2020-2501,CVE-2021-28797 Stack Buffer Overflow in QNAP Surveillance Station CVE-2021-34730 Critical UPnP Service Flaw on Cisco Small Business RV Series Routers CVE-2020-35785 Multiple HTTP authentication vulnerabilities on DGN2200v1
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-34861 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-34861 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
CPE Deprecation Remap by [email protected]
Apr. 26, 2023
Action Type Old Value New Value Changed CPE Configuration OR *cpe:2.3:o:d-link:dap-2020_firmware:*:*:*:*:*:*:*:* versions from (including) 1.01 OR *cpe:2.3:o:dlink:dap-2020_firmware:*:*:*:*:*:*:*:* versions from (including) 1.01 -
CPE Deprecation Remap by [email protected]
Apr. 26, 2023
Action Type Old Value New Value Changed CPE Configuration OR *cpe:2.3:h:d-link:dap-2020:*:*:*:*:*:*:*:* OR *cpe:2.3:h:dlink:dap-2020:*:*:*:*:*:*:*:* -
Initial Analysis by [email protected]
Oct. 27, 2021
Action Type Old Value New Value Added CVSS V2 NIST (AV:A/AC:L/Au:N/C:P/I:P/A:P) Added CVSS V3.1 NIST AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Changed Reference Type https://supportannouncement.us.dlink.com/announcement/publication.aspx?name=SAP10201 No Types Assigned https://supportannouncement.us.dlink.com/announcement/publication.aspx?name=SAP10201 Patch, Vendor Advisory Changed Reference Type https://www.zerodayinitiative.com/advisories/ZDI-21-977/ No Types Assigned https://www.zerodayinitiative.com/advisories/ZDI-21-977/ Third Party Advisory, VDB Entry Added CPE Configuration AND OR *cpe:2.3:o:d-link:dap-2020_firmware:*:*:*:*:*:*:*:* versions up to (including) 1.01 OR cpe:2.3:h:d-link:dap-2020:*:*:*:*:*:*:*:* -
CVE Modified by [email protected]
Oct. 25, 2021
Action Type Old Value New Value Changed Description This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of D-Link DAP-2020 1.01rc001 routers. Authentication is not required to exploit this vulnerability. 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 vulnerability to execute code in the context of root. Was ZDI-CAN-12104. This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of D-Link DAP-2020 1.01rc001 routers. Authentication is not required to exploit this vulnerability. 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 vulnerability to execute code in the context of root. Was ZDI-CAN-12104.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-34861 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-34861
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.28 }} -0.05%
score
0.68818
percentile