CVE-2021-4248 kapetan dns Request.cs entropy
Insufficient entropy in the PRNG allows remote attackers to predict DNS request identifiers, potentially enabling cache poisoning or spoofing attacks.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-4248?
CVE-2021-4248 is a medium-severity vulnerability in kapetan dns, published on 18 Dec 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability was found in kapetan dns up to 6.1.0. It has been rated as problematic. Affected by this issue is some unknown functionality of the file DNS/Protocol/Request.cs. The manipulation leads to insufficient entropy in prng. The attack may be launched remotely. Upgrading to version 7.0.0 is able to address this issue. The name of the patch is cf7105aa2aae90d6656088fe5a8ee1d5730773b6. It is recommended to upgrade the affected component. The identifier of this vulnerability is VDB-216188.
Weakness: CWE-330
Which versions are affected by CVE-2021-4248?
2 open source packages ship an affected version, including DNS. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
DNS NuGet | All versions | 7.0.0 |
DNS NuGet | All versions | 7.0.0 |
Products include Kapetan Dns Project Kapetan Dns.
How do I fix CVE-2021-4248?
Upgrade DNS to 7.0.0 or later.
Is CVE-2021-4248 being exploited?
There is no known exploitation of CVE-2021-4248 in the wild and no public exploit code.
Sources
Also known as GHSA-g3wc-xv93-445q.