PT-2022-5731 · Tp Link · Tp-Link Tl-Wr940N

Exluck · Published 2022-11-21 · Updated 2023-04-07 · CVE-2022-43636

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 TP-Link TL-WR940N version 3.20.1(US)

Description This issue allows network-adjacent attackers to bypass authentication on affected installations of TP-Link TL-WR940N routers. The specific flaw exists within the httpd service, which listens on TCP port 80 by default. The issue results from the lack of sufficient randomness in the sequence numbers used for session management. An attacker can leverage this issue to bypass authentication on the system.

Recommendations For TP-Link TL-WR940N version 3.20.1(US), consider disabling the httpd service until a patch is available to prevent exploitation. Restrict access to TCP port 80 to minimize the risk of unauthorized access. At the moment, there is no information about a newer version that contains a fix for this issue.

Fix

Use of Insufficiently Random Values

Weakness Enumeration

CWE-330

Related Identifiers

BDU:2022-07130

CVE-2022-43636

ZDI-22-1614

Affected Products

Tp-Link Tl-Wr940N

References · 7

• https://bdu.fstec.ru/vul/2022-07130 · Security Note
• https://zerodayinitiative.com/advisories/ZDI-22-1614 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2022-43636 · Security Note
• https://osv.dev/vulnerability/CVE-2022-43636 · Vendor Advisory
• https://t.me/cvenotify/47120 · Telegram Post
• https://t.me/cibsecurity/61059 · Telegram Post
• https://cybersecurity-help.cz/vdb/SB2022112409 · Note