Zyxel security advisory for multiple vulnerabilities of firewalls, AP controllers, and APs

Zyxel_Jason

CVE:  CVE-2022-0734, CVE-2022-26531, CVE-2022-26532, CVE-2022-0910

Summary

Zyxel is aware of multiple vulnerabilities reported by security consultancies and advises users to install the applicable firmware updates for optimal protection.

What is the vulnerability?

CVE-2022-0734

A cross-site scripting vulnerability was identified in the CGI program of some firewall versions that could allow an attacker to obtain some information stored in the user’s browser, such as cookies or session tokens, via a malicious script.

CVE-2022-26531

Multiple improper input validation flaws were identified in some CLI commands of some firewall, AP controller, and AP versions that could allow a local authenticated attacker to cause a buffer overflow or a system crash via a crafted payload.

CVE-2022-26532

A command injection vulnerability in the "packet-trace" CLI command of some firewall, AP controller, and AP versions could allow a local authenticated attacker to execute arbitrary OS commands by including crafted arguments to the command.

CVE-2022-0910

An authentication bypass vulnerability caused by the lack of a proper access control mechanism has been found in the CGI program of some firewall versions. The flaw could allow an attacker to downgrade from two-factor authentication to one-factor authentication via an IPsec VPN client.

What versions are vulnerable—and what should you do?

After a thorough investigation, we’ve identified the vulnerable products that are within their vulnerability support period and released patches to address the CVEs, as shown in the tables below.

Table 1. Firewalls affected by CVE-2022-0734, CVE-2022-26531, CVE-2022-26532, and CVE-2022-0910

Firewall	Affected version				Patch availability
	CVE-2022-0734	CVE-2022-26531	CVE-2022-26532	CVE-2022-0910
USG/ZyWALL	ZLD V4.35~V4.70	ZLD V4.09~V4.71	ZLD V4.09~V4.71	ZLD V4.32~V4.71	ZLD V4.72
USG FLEX	ZLD V4.50~V5.20	ZLD V4.50~V5.21	ZLD V4.50~V5.21	ZLD V4.50~V5.21	ZLD V5.30
ATP	ZLD V4.35~V5.20	ZLD V4.32~V5.21	ZLD V4.32~V5.21	ZLD V4.32~V5.21	ZLD V5.30
VPN	ZLD V4.35~V5.20	ZLD V4.30~V5.21	ZLD V4.30~V5.21	ZLD V4.32~V5.21	ZLD V5.30
NSG	Not affected	V1.00~V1.33 Patch 4	V1.00~V1.33 Patch 4	Not affected	V1.33 Patch 5*

*Available in middle of Jun.

Table 2. AP controllers affected by CVE-2022-26531 and CVE-2022-26532

AP Controller	Affected version	Patch availability
	CVE-2022-26531 and CVE-2022-26532
NXC2500	6.10(AAIG.3) and earlier	Hotfix by request**
NXC5500	6.10(AAOS.3) and earlier	Hotfix by request**

Table 3. APs affected by CVE-2022-26531 and CVE-2022-26532

AP	Affected version	Patch availability
	CVE-2022-26531 and CVE-2022-26532
NAP203	6.25(ABFA.7) and earlier	6.25(ABFA.8)
NAP303	6.25(ABEX.7) and earlier	6.25(ABEX.8)
NAP353	6.25(ABEY.7) and earlier	6.25(ABEY.8)
NWA50AX	6.25(ABYW.5) and earlier	6.25(ABYW.8)
NWA55AXE	6.25(ABZL.5) and earlier	6.25(ABZL.8)
NWA90AX	6.27(ACCV.2) and earlier	6.27(ACCV.3)
NWA110AX	6.30(ABTG.2) and earlier	6.30(ABTG.3)
NWA210AX	6.30(ABTD.2) and earlier	6.30(ABTD.3)
NWA1123-AC-HD	6.25(ABIN.6) and earlier	6.25(ABIN.8)
NWA1123-AC-PRO	6.25(ABHD.7) and earlier	6.25(ABHD.8)
NWA1123ACv3	6.30(ABVT.2) and earlier	6.30(ABVT.3)
NWA1302-AC	6.25(ABKU.6) and earlier	6.25(ABKU.8)
NWA5123-AC-HD	6.25(ABIM.6) and earlier	6.25(ABIM.8)
WAC500H	6.30(ABWA.2) and earlier	6.30(ABWA.3)
WAC500	6.30(ABVS.2) and earlier	6.30(ABVS.3)
WAC5302D-S	6.10(ABFH.10) and earlier	Hotfix by request**
WAC5302D-Sv2	6.25(ABVZ.6) and earlier	6.25(ABVZ.8)
WAC6103D-I	6.25(AAXH.7) and earlier	6.25(AAXH.8)
WAC6303D-S	6.25(ABGL.6) and earlier	6.25(ABGL.8)
WAC6502D-E	6.25(AASD.7) and earlier	6.25(AASD.8)
WAC6502D-S	6.25(AASE.7) and earlier	6.25(AASE.8)
WAC6503D-S	6.25(AASF.7) and earlier	6.25(AASF.8)
WAC6553D-E	6.25(AASG.7) and earlier	6.25(AASG.8)
WAC6552D-S	6.25(ABIO.7) and earlier	6.25(ABIO.8)
WAX510D	6.30(ABTF.2) and earlier	6.30(ABTF.3)
WAX610D	6.30(ABTE.2) and earlier	6.30(ABTE.3)
WAX630S	6.30(ABZD.2) and earlier	6.30(ABZD.3)
WAX650S	6.30(ABRM.2) and earlier	6.30(ABRM.3)

**Please reach out to your local Zyxel support team for the file.

Got a question?

Please contact your local service rep or visit Zyxel’s forum for further information or assistance.

Acknowledgments and commentary

Thanks to the following security consultancies for reporting the issues to us:

• Riccardo Krauter at Soter IT Security for CVE-2022-0734
• HN Security for CVE-2022-26531 and CVE-2022-26532
• Ascend PC for CVE-2022-0910

Revision history

2022-05-24: Initial release
2022-05-27: Updated NSG’s patch schedule

Zyxel_CSO

The date firmware for NXC2500, NXC5500, and WAC5302D-S is ready. 

Please download the file from the below link:

https://unizyx-my.sharepoint.com/:f:/g/personal/hsinbo_lin_zyxel_com_tw/Eqj4drk4sxtDiCUocKML0yQBoG9dTcCYYngkVlnGDsJjpw?e=qX9GOU