CVE-2021-33318 Improper Input Validation in IpMatcher
Insufficient input validation in WatsonWebserver and IpMatcher allows bypassing IP-based access controls by manipulating IP address and netmask inputs.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-33318?
CVE-2021-33318 is a critical vulnerability in n/a, published on 16 May 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An Input Validation Vulnerability exists in Joel Christner .NET C# packages WatsonWebserver, IpMatcher 1.0.4.1 and below (IpMatcher) and 4.1.3 and below (WatsonWebserver) due to insufficient validation of input IP addresses and netmasks against the internal Matcher list of IP addresses and subnets.
Weakness: CWE-704
Which versions are affected by CVE-2021-33318?
2 open source packages ship an affected version, including IpMatcher. It affects 2 products.
| Package | Affected | Fixed in |
|---|---|---|
IpMatcher NuGet | All versions | 1.0.4.2 |
IpMatcher NuGet | All versions | 1.0.4.2 |
Products include Ipmatcher Project Ipmatcher, Watsonwebserver Project Watsonwebserver.
How do I fix CVE-2021-33318?
Upgrade IpMatcher to 1.0.4.2 or later.
Is CVE-2021-33318 being exploited?
There is no known exploitation of CVE-2021-33318 in the wild and no public exploit code.
Sources
Also known as GHSA-qj93-37f5-mr29.