CVE-2021-36741 Trend Micro Apex One, Apex One as a Service, and Worry-Free Business Security: file path flaw
In plain words: The program can be tricked into reading or writing files outside the folder it should stay in. Leaks files such as passwords and settings, or overwrites important ones.
Confirmed exploited by CISA on · US federal patch deadline Nov 17, 2021
What to do
- Install Trend Micro's security update for Apex One, Apex One as a Service, and Worry-Free Business Security. If no update exists, follow the vendor's workaround or stop using the product until one ships.
- Keep a list of every internet-facing server you run so nothing is forgotten.
- Patch anything in this catalog first, ahead of normal patch cycles.
- Put admin and file-transfer apps behind a VPN or single sign-on instead of the open internet.
Who is affected
Work IT. Aimed mostly at company systems — you are affected through the companies you use, not your own phone.
What's at risk: Mass data theft and ransomware: a single flaw in a file-transfer or email server has exposed thousands of organisations at once.
The details
- Official name
- Trend Micro Multiple Products Improper Input Validation Vulnerability
- Product
- Trend Micro Apex One, Apex One as a Service, and Worry-Free Business Security
- CISA description
- Trend Micro Apex One, Apex One as a Service, and Worry-Free Business Security contain an improper input validation vulnerability that allows a remote attacker to upload files.
- Type of flaw
- File path flaw (CWE-22)
- Confirmed exploited
- Nov 3, 2021
- US federal patch deadline
- Nov 17, 2021
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Answering about CVE-2021-36741 ·
Questions about CVE-2021-36741
Is CVE-2021-36741 being exploited?
Yes. CISA added CVE-2021-36741 to its Known Exploited Vulnerabilities catalog on Nov 3, 2021, which means there is reliable evidence of real-world attacks.
How do I fix CVE-2021-36741?
Install Trend Micro's security update for Apex One, Apex One as a Service, and Worry-Free Business Security. If no update exists, follow the vendor's workaround or stop using the product until one ships. Keep a list of every internet-facing server you run so nothing is forgotten.
Am I affected by CVE-2021-36741?
Only if you use Trend Micro Apex One, Apex One as a Service, and Worry-Free Business Security. Aimed mostly at company systems — you are affected through the companies you use, not your own phone.