Vulnerability Description
An issue was discovered in HCC Nichestack 3.0. The code that parses TCP packets relies on an unchecked value of the IP payload size (extracted from the IP header) to compute the length of the TCP payload within the TCP checksum computation function. When the IP payload size is set to be smaller than the size of the IP header, the TCP checksum computation function may read out of bounds (a low-impact write-out-of-bounds is also possible).
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Hcc-Embedded | Nichestack | 3.0 |
| Siemens | Sentron 3Wl Com35 Firmware | < 1.2.0 |
| Siemens | Sentron 3Wl Com35 | - |
| Siemens | Sentron 3Wa Com190 Firmware | < 2.0.0 |
| Siemens | Sentron 3Wa Com190 | - |
Related Weaknesses (CWE)
References
- https://cert-portal.siemens.com/productcert/pdf/ssa-789208.pdfMitigationThird Party Advisory
- https://www.forescout.com/blog/new-critical-operational-technology-vulnerabilitiMitigationThird Party Advisory
- https://www.hcc-embedded.comProduct
- https://www.kb.cert.org/vuls/id/608209Third Party AdvisoryUS Government Resource
- https://cert-portal.siemens.com/productcert/pdf/ssa-789208.pdfMitigationThird Party Advisory
- https://www.forescout.com/blog/new-critical-operational-technology-vulnerabilitiMitigationThird Party Advisory
- https://www.hcc-embedded.comProduct
- https://www.kb.cert.org/vuls/id/608209Third Party AdvisoryUS Government Resource
FAQ
What is CVE-2020-35684?
CVE-2020-35684 is a vulnerability with a CVSS score of 7.5 (HIGH). An issue was discovered in HCC Nichestack 3.0. The code that parses TCP packets relies on an unchecked value of the IP payload size (extracted from the IP header) to compute the length of the TCP payl...
How severe is CVE-2020-35684?
CVE-2020-35684 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2020-35684?
Check the references section above for vendor advisories and patch information. Affected products include: Hcc-Embedded Nichestack, Siemens Sentron 3Wl Com35 Firmware, Siemens Sentron 3Wl Com35, Siemens Sentron 3Wa Com190 Firmware, Siemens Sentron 3Wa Com190.