CVE-2023-24955 Microsoft SharePoint Server: command or code injection
In plain words: The program treats text it receives as instructions instead of plain data. The attacker can run commands on the machine — often the whole device is taken over.
Confirmed exploited by CISA on · US federal patch deadline Apr 16, 2024
What to do
- Install Microsoft's security update for SharePoint Server. 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
- Microsoft SharePoint Server Code Injection Vulnerability
- Product
- Microsoft SharePoint Server
- CISA description
- Microsoft SharePoint Server contains a code injection vulnerability that allows an authenticated attacker with Site Owner privileges to execute code remotely.
- Type of flaw
- Command or code injection (CWE-94)
- Confirmed exploited
- Mar 26, 2024 — known to be used in ransomware attacks
- US federal patch deadline
- Apr 16, 2024
Ask Cleus about it
Ask about a vulnerability, an update, a weird message, or the news. Plain-word answers, free, no account.
Answering about CVE-2023-24955 ·
Questions about CVE-2023-24955
Is CVE-2023-24955 being exploited?
Yes. CISA added CVE-2023-24955 to its Known Exploited Vulnerabilities catalog on Mar 26, 2024, which means there is reliable evidence of real-world attacks, including by ransomware groups.
How do I fix CVE-2023-24955?
Install Microsoft's security update for SharePoint Server. 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-2023-24955?
Only if you use Microsoft SharePoint Server. Aimed mostly at company systems — you are affected through the companies you use, not your own phone.