Ubiquiti AirOS Command Injection Vulnerability

[ Why it matters ]Priority signals

• Exploited in the wild: on CISA's Known Exploited Vulnerabilities list since 2022-04-15
• EPSS: 40% chance of exploitation in the next 30 days (higher than 99% of CVEs)
• Critical severity: CVSS 9.8

[ Description ]Official description

On certain Ubiquiti devices, Command Injection exists via a GET request to stainfo.cgi (aka Show AP info) because the ifname variable is not sanitized, as demonstrated by shell metacharacters. The fixed version is v4.0.1 for 802.11 ISP products, v5.3.5 for AirMax ISP products, and v5.4.5 for AirSync firmware. For example, Nanostation5 (Air OS) is affected.

CISA: Certain Ubiquiti devices contain a command injection vulnerability via a GET request to stainfo.cgi.

[ Fixes ]Fixes and patches

CISA required action (US federal deadline 6 May 2022): Apply updates per vendor instructions.

• Patch on community.ubnt.comVendor patch or bulletin · NVD · Reference tagged 'Patch' by NVD

[ References ]References

• community.ubnt.com/t5/airMAX-General-Discussion/AirOS-Security-Exploit-Updated-Firmware…Issue TrackingPatchVendor Advisory
• www.exploit-db.com/exploits/14146Third Party AdvisoryVDB Entry
• www.cisa.gov/known-exploited-vulnerabilities-catalogUS Government Resource