CVE-2023-32737 Deserialization in SIMATIC STEP 7 Safety V18
An attacker can execute arbitrary code in SIMATIC STEP 7 Safety by exploiting unsafe .NET BinaryFormatter deserialization of user-controllable input.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2023-32737?
CVE-2023-32737 is a high-severity unsafe deserialization vulnerability in Siemens SIMATIC STEP 7 Safety V18, published on 9 Jul 2024. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
A vulnerability has been identified in SIMATIC STEP 7 Safety V18 (All versions < V18 Update 2). Affected applications do not properly restrict the .NET BinaryFormatter when deserializing user-controllable input. This could allow an attacker to cause a type confusion and execute arbitrary code within the affected application. This is the same issue that exists for .NET BinaryFormatter https://docs.microsoft.com/en-us/visualstudio/code-quality/ca2300.
Weakness: CWE-502
Which versions are affected by CVE-2023-32737?
How do I fix CVE-2023-32737?
No fix has been published for CVE-2023-32737 yet. Limit exposure of the affected software until one is available.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2023-32737 being exploited?
There is no known exploitation of CVE-2023-32737 in the wild and no public exploit code.
Sources
Also known as GHSA-v9r2-vfw5-q6j9.