CVE-2017-0147 Microsoft SMBv1 server: information leak
In plain words: The program reveals information it should keep private. Leaked secrets — tokens, passwords or memory contents — that help a bigger attack.
Confirmed exploited by CISA on · US federal patch deadline Jun 14, 2022
What to do
- Install Microsoft's security update for SMBv1 server. If no update exists, follow the vendor's workaround or stop using the product until one ships.
- Turn on automatic updates for the operating system and for Office, PDF and archive apps.
- Be careful with unexpected attachments — documents, .zip/.rar files and shortcuts are common bait.
- Use a normal (non-admin) account day to day and keep built-in protection like Microsoft Defender on.
Who is affected
Could reach you. Used in ransomware, which spreads to ordinary people and small businesses.
What's at risk: Your files, saved passwords and accounts. Many of these let a program that is already running gain full administrator control.
The details
- Official name
- Microsoft Windows SMBv1 Information Disclosure Vulnerability
- Product
- Microsoft SMBv1 server
- CISA description
- The SMBv1 server in Microsoft Windows allows remote attackers to obtain sensitive information from process memory via a crafted packet.
- Type of flaw
- Information leak (CWE-200)
- Confirmed exploited
- May 24, 2022 — known to be used in ransomware attacks
- US federal patch deadline
- Jun 14, 2022
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Answering about CVE-2017-0147 ·
Questions about CVE-2017-0147
Is CVE-2017-0147 being exploited?
Yes. CISA added CVE-2017-0147 to its Known Exploited Vulnerabilities catalog on May 24, 2022, which means there is reliable evidence of real-world attacks, including by ransomware groups.
How do I fix CVE-2017-0147?
Install Microsoft's security update for SMBv1 server. If no update exists, follow the vendor's workaround or stop using the product until one ships. Turn on automatic updates for the operating system and for Office, PDF and archive apps.
Am I affected by CVE-2017-0147?
Only if you use Microsoft SMBv1 server. Used in ransomware, which spreads to ordinary people and small businesses.