CVEs: 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 are the vulnerabilities?
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.
Multiple improper input validation flaws were identified in some CLI commands of some firewall, AP controller, and AP versions that could allow a locally authenticated attacker to cause a buffer overflow or a system crash via a crafted payload.
A command injection vulnerability in the "packet-trace" CLI command of some firewall, AP controller, and AP versions could allow a locally authenticated attacker to execute arbitrary OS commands by including crafted arguments to the command.
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 through Nebula Upgrade |
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 | Download |
| NXC5500 | 6.10(AAOS.3) and earlier | Download |
Table 3. APs affected by CVE-2022-26531 and CVE-2022-26532
[Download from Download Libary]
| 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 | Download |
| 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) |
Got a question?
Please contact us, if need further assistance!
Acknowledgment
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