PatchSiren cyber security CVE debrief

CVE-2023-33128 Microsoft CVE debrief

CVE-2023-33128 is a remote code execution vulnerability affecting .NET and Visual Studio, with specific impact on Siemens ST7 ScadaConnect (6NH7997-5DA10-0AA0). Published on June 11, 2024, this vulnerability carries a HIGH severity CVSS score of 7.3. The vulnerability stems from the underlying .NET and Visual Studio components used by the affected Siemens product. According to CISA advisory ICSA-24-165-04, the vulnerability requires local attack vector access with low attack complexity, low privileges, and user interaction. Successful exploitation could result in high impact to confidentiality, integrity, and availability. Siemens has released a vendor fix in version 1.1 or later to address this vulnerability. Organizations using affected ST7 ScadaConnect deployments should prioritize updating to the remediated version.

Vendor: Microsoft
Product: SINEC PNI
CVSS: HIGH 7.3
CISA KEV: Not listed in stored evidence
Original CVE published: 2023-11-14
Original CVE updated: 2023-11-14
Advisory published: 2023-11-14
Advisory updated: 2023-11-14

Who should care

Organizations operating Siemens ST7 ScadaConnect (6NH7997-5DA10-0AA0) in industrial control system environments, particularly those in critical infrastructure sectors. System administrators responsible for OT/ICS security patching and vulnerability management programs.

Technical summary

This vulnerability exists in the .NET and Visual Studio components utilized by Siemens ST7 ScadaConnect. The CVSS 3.1 vector (AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C) indicates a local attack vector requiring low privileges and user interaction, with high impacts across confidentiality, integrity, and availability. Exploitation proof-of-concept exists. The vulnerability was remediated by Siemens in version 1.1 of the affected product.

Defensive priority

HIGH

Recommended defensive actions

Update Siemens ST7 ScadaConnect (6NH7997-5DA10-0AA0) to version 1.1 or later
Review CISA ICS recommended practices for defense-in-depth strategies
Monitor Siemens ProductCERT advisories for additional guidance
Apply principle of least privilege to limit local access for exploitation
Validate .NET and Visual Studio component versions in affected environments

Evidence notes

CVE published and modified 2024-06-11 per official record. CISA CSAF advisory ICSA-24-165-04 published same date. Siemens SSA-341067 provides vendor-specific guidance. CVSS vector indicates local attack vector with user interaction required.

Official resources

2024-06-11