CVE-2020-35685
HCC Nichestack TCP ISN Generation Vulnerability (Predictable ISN Generation)
Description
An issue was discovered in HCC Nichestack 3.0. The code that generates Initial Sequence Numbers (ISNs) for TCP connections derives the ISN from an insufficiently random source. As a result, an attacker may be able to determine the ISN of current and future TCP connections and either hijack existing ones or spoof future ones. (Proper ISN generation should aim to follow at least the specifications outlined in RFC 6528.)
INFO
Published Date :
Aug. 19, 2021, 12:15 p.m.
Last Modified :
Aug. 26, 2021, 6:21 p.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
5.2
Exploitability Score :
3.9
Affected Products
The following products are affected by CVE-2020-35685
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2020-35685.
| URL | Resource |
|---|---|
| https://cert-portal.siemens.com/productcert/pdf/ssa-789208.pdf | Mitigation Third Party Advisory |
| https://www.forescout.com/blog/new-critical-operational-technology-vulnerabilities-found-on-nichestack/ | Mitigation Third Party Advisory |
| https://www.hcc-embedded.com | Product |
| https://www.kb.cert.org/vuls/id/608209 | Third Party Advisory US Government Resource |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2020-35685 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2020-35685 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Reanalysis by [email protected]
Aug. 26, 2021
Action Type Old Value New Value Added CPE Configuration AND OR *cpe:2.3:o:siemens:sentron_3wl_com35_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 1.2.0 OR cpe:2.3:h:siemens:sentron_3wl_com35:-:*:*:*:*:*:*:* -
Initial Analysis by [email protected]
Aug. 26, 2021
Action Type Old Value New Value Added CVSS V2 NIST (AV:N/AC:L/Au:N/C:P/I:P/A:N) Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N Changed Reference Type https://cert-portal.siemens.com/productcert/pdf/ssa-789208.pdf No Types Assigned https://cert-portal.siemens.com/productcert/pdf/ssa-789208.pdf Mitigation, Third Party Advisory Changed Reference Type https://www.forescout.com/blog/new-critical-operational-technology-vulnerabilities-found-on-nichestack/ No Types Assigned https://www.forescout.com/blog/new-critical-operational-technology-vulnerabilities-found-on-nichestack/ Mitigation, Third Party Advisory Changed Reference Type https://www.hcc-embedded.com No Types Assigned https://www.hcc-embedded.com Product Changed Reference Type https://www.kb.cert.org/vuls/id/608209 No Types Assigned https://www.kb.cert.org/vuls/id/608209 Third Party Advisory, US Government Resource Added CWE NIST CWE-330 Added CPE Configuration OR *cpe:2.3:a:hcc-embedded:nichestack:3.0:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:siemens:sentron_3wa_com190_firmware:*:*:*:*:*:*:*:* versions up to (excluding) 2.0.0 OR cpe:2.3:h:siemens:sentron_3wa_com190:-:*:*:*:*:*:*:*
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2020-35685 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2020-35685
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.12 }} 0.01%
score
0.45507
percentile