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Zyxel security advisory for OS command injection vulnerabilities of GS1900, XGS1210, and XGS1250 series switches

CVEs: CVE-2021-35031, CVE-2021-35032


Summary

Zyxel has released patches addressing OS command injection vulnerabilities in the GS1900, XGS1210, and XGS1250 series of switches. Users are advised to install the applicable firmware updates for optimal protection.


What are the vulnerabilities?

CVE-2021-35031

An OS command injection vulnerability was identified in the TFTP client of Zyxel’s GS1900, XGS1210, and XGS1250 series of switches, such that an authenticated local user could execute arbitrary OS commands via the GUI of the vulnerable device.

CVE-2021-35032

An OS command injection vulnerability was identified in the libsal.so of Zyxel’s GS1900 series switches, such that an authenticated local user could execute OS commands via internal function calls.


What versions are vulnerable—and what should you do?

After a thorough investigation, we’ve identified the vulnerable switches for CVE-2021-35031 and CVE-2021-35032 that are within their warranty and support period, with their firmware patches shown in the table below.

CVE Affected model Patch availability
CVE-2021-35031
CVE-2021-35032
GS1900-8 V2.70(AAHH.0)-20211208
GS1900-8HP V2.70(AAHI.0)-20211208
GS1900-10HP V2.70(AAZI.0)-20211208
GS1900-16 V2.70(AAHJ.0)-20211208
GS1900-24E V2.70(AAHK.0)-20211208
GS1900-24EP V2.70(ABTO.0)-20211208
GS1900-24 V2.70(AAHL.0)-20211208
GS1900-24HP V2.70(AAHM.0)-20211208
GS1900-24HPv2 V2.70(ABTP.0)-20211208
GS1900-48 V2.70(AAHN.0)-20211208
GS1900-48HP V2.70(AAHO.0)-20211208
GS1900-48HPv2 V2.70(ABTQ.0)-20211208
CVE-2021-35031 XGS1210-12 V1.00(ABTY.5)C0
CVE-2021-35031 XGS1250-12 V1.00(ABWE.1)C0

Got a question?

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


Acknowledgment

Thanks to Jasper Lievisse Adriaanse for reporting the issue to us.


Revision history

2021-12-28: Initial release
2022-1-4: Updated patch availability