Multiple vulnerabilities in Zyxel devices



Published: 2022-04-25
Risk Low
Patch available YES
Number of vulnerabilities 2
CVE-ID CVE-2022-26413
CVE-2022-26414
CWE-ID CWE-78
CWE-119
Exploitation vector Local network
Public exploit N/A
Vulnerable software
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VMG4927-B50A
Hardware solutions / Routers for home users

VMG3927-B50B
Hardware solutions / Routers for home users

EMG6726-B10A
Hardware solutions / Routers for home users

EMG5523-T50B
Hardware solutions / Routers for home users

EMG3525-T50B
Hardware solutions / Routers for home users

Vendor ZyXEL Communications Corp.

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) OS Command Injection

EUVDB-ID: #VU62547

Risk: Low

CVSSv3.1: 7 [CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-26413

CWE-ID: CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary shell commands on the target system.

The vulnerability exists due to improper input validation in the CGI program. A remote user on the local network can pass specially crafted data to the application and execute arbitrary OS commands on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

Install update from vendor's website planning to be released in June and September 2022.

Vulnerable software versions

VMG4927-B50A: before V5.13(ABLY.7)C0

VMG3927-B50B: before V5.13(ABLY.7)C0

EMG6726-B10A: before V5.13(ABNP.7)C0

EMG5523-T50B: before V5.50(ABSL.0)B12, V5.50(ABPM.6)C0

EMG3525-T50B: before V5.50(ABSL.0)B12, V5.50(ABPM.6)C0


CPE2.3 External links

http://www.zyxel.com/support/OS-command-injection-and-buffer-overflow-vulnerabilities-of-CPE-and-ONTs.shtml

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user 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) Buffer overflow

EUVDB-ID: #VU62548

Risk: Low

CVSSv3.1: 4.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-26414

CWE-ID: CWE-119 - Improper Restriction of Operations within the Bounds of a Memory Buffer

Exploit availability: No

Description

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to a boundary error in some internal functions. A local user can trigger memory corruption and cause a denial of service condition on the target system.

Mitigation

Install update from vendor's website planning to be released in June and September 2022.

Vulnerable software versions

VMG4927-B50A: before V5.13(ABLY.7)C0

VMG3927-B50B: before V5.13(ABLY.7)C0

EMG6726-B10A: before V5.13(ABNP.7)C0

EMG5523-T50B: before V5.50(ABSL.0)B12, V5.50(ABPM.6)C0

EMG3525-T50B: before V5.50(ABSL.0)B12, V5.50(ABPM.6)C0


CPE2.3 External links

http://www.zyxel.com/support/OS-command-injection-and-buffer-overflow-vulnerabilities-of-CPE-and-ONTs.shtml

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

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.

The attacker would have to login to the system and perform certain actions 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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