Remote code execution in Zyxel firewalls and access points



Published: 2020-11-26
Risk High
Patch available YES
Number of vulnerabilities 1
CVE ID N/A
CWE ID CWE-119
Exploitation vector Network
Public exploit N/A
Vulnerable software
Subscribe
VPN series
Client/Desktop applications / Antivirus software/Personal firewalls

USG series
Client/Desktop applications / Antivirus software/Personal firewalls

USG FLEX series
Client/Desktop applications / Antivirus software/Personal firewalls

Unified Pro series
Hardware solutions / Other hardware appliances

Unified series
Hardware solutions / Other hardware appliances

Standalone series
Hardware solutions / Other hardware appliances

Vendor ZyXEL Communications Corp.

Security Advisory

This security advisory describes one high risk vulnerability.

1) Buffer overflow

Risk: High

CVSSv3: 8.5 [CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C] [PCI]

CVE-ID: N/A

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

Exploit availability: No

Description

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

The vulnerability exists due to a boundary error in the "fbwifi_continue" CGI program. A remote attacker can trigger memory corruption and execute arbitrary code on the target system.

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

Mitigation

Install updates from vendor's website.

Vulnerable software versions

VPN series: 4.30, 4.55

USG series: 4.30, 4.55

USG FLEX series: 4.30, 4.55

Unified Pro series: before 6.10 patch 8

Unified series: before 6.10 patch 8

Standalone series: before 6.10 patch 8

CPE External links

https://www.zyxel.com/support/Zyxel-security-advisory-for-buffer-overflow-vulnerability.shtml

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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



###SIDEBAR###