CVE-2021-23438 Prototype Pollution
A type confusion vulnerability in the mpath library allows bypassing previous prototype pollution protections, potentially leading to security feature bypasses.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-23438?
CVE-2021-23438 is a medium-severity vulnerability in mpath, published on 1 Sep 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
This affects the package mpath before 0.8.4. A type confusion vulnerability can lead to a bypass of CVE-2018-16490. In particular, the condition ignoreProperties.indexOf(parts[i]) !== -1 returns -1 if parts[i] is ['__proto__']. This is because the method that has been called if the input is an array is Array.prototype.indexOf() and not String.prototype.indexOf(). They behave differently depending on the type of the input.
Weakness: CWE-843
Which versions are affected by CVE-2021-23438?
2 open source packages ship an affected version, including mpath. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
mpath npm | All versions | 0.8.4 |
mpath npm | All versions | 0.8.4 |
Products include Mpath Project Mpath.
How do I fix CVE-2021-23438?
Upgrade mpath to 0.8.4 or later.
Is CVE-2021-23438 being exploited?
There is no known exploitation of CVE-2021-23438 in the wild and no public exploit code.
Other vulnerabilities in mpath
Sources
Also known as GHSA-p92x-r36w-9395.