CVE-2020-35685 Weak cryptography in n/a
Attackers can predict TCP Initial Sequence Numbers to hijack existing connections or spoof future ones due to insufficient randomness in the HCC Nichestack implementation.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2020-35685?
CVE-2020-35685 is a critical vulnerability in n/a, published on 19 Aug 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.)
Weakness: CWE-330
Which versions are affected by CVE-2020-35685?
It affects 3 products.
Products include Hcc-Embedded Nichestack, Siemens Sentron 3wa Com190 Firmware, Siemens Sentron 3wl Com35 Firmware.
How do I fix CVE-2020-35685?
No fix has been published for CVE-2020-35685 yet. Limit exposure of the affected software until one is available.
Is CVE-2020-35685 being exploited?
There is no known exploitation of CVE-2020-35685 in the wild and no public exploit code.
Other vulnerabilities in n/a
Sources
Also known as GHSA-hf8h-gvq7-6gfr.