Multiple vulnerabilities in TP-Link TL-WR940N



Risk Medium
Patch available YES
Number of vulnerabilities 2
CVE-ID CVE-2022-43636
CVE-2022-43635
CWE-ID CWE-330
CWE-303
Exploitation vector Local network
Public exploit N/A
Vulnerable software
 TL-WR940N
Hardware solutions / Routers for home users

Vendor TP-Link

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Use of insufficiently random values

EUVDB-ID: #VU69569

Risk: Medium

CVSSv4.0: 5.2 [CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2022-43636

CWE-ID: CWE-330 - Use of Insufficiently Random Values

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists due to the lack of sufficient randomness in the sequnce numbers used for session managment within the httpd service. A remote attacker on the local network can bypass authentication process and gain unauthorized access to the application.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

TL-WR940N: All versions

CPE2.3 External links

https://www.zerodayinitiative.com/advisories/ZDI-22-1614/


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected device in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Incorrect Implementation of Authentication Algorithm

EUVDB-ID: #VU69570

Risk: Low

CVSSv4.0: 4.9 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2022-43635

CWE-ID: CWE-303 - Incorrect Implementation of Authentication Algorithm

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to the incorrect implementation of the authentication algorithm within the httpd service. A remote attacker on the local network can gain unauthorized access to sensitive information on the system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

TL-WR940N: All versions

CPE2.3 External links

https://www.zerodayinitiative.com/advisories/ZDI-22-1615/


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected device in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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