CVE-2021-21373 Nimble falls back to insecure http url when fetching packages
Nimble package manager falls back to insecure HTTP on error, allowing Man-in-the-Middle attackers to inject malicious packages leading to code execution.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2021-21373?
CVE-2021-21373 is a high-severity vulnerability in nim-lang security, published on 26 Mar 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Nimble is a package manager for the Nim programming language. In Nim release versions before versions 1.2.10 and 1.4.4, "nimble refresh" fetches a list of Nimble packages over HTTPS by default. In case of error it falls back to a non-TLS URL http://irclogs.nim-lang.org/packages.json. An attacker able to perform MitM can deliver a modified package list containing malicious software packages. If the packages are installed and used the attack escalates to untrusted code execution.
Which versions are affected by CVE-2021-21373?
It affects 1 product.
Products include Nim-Lang Nim.
How do I fix CVE-2021-21373?
Upgrade to a fixed version.
Is CVE-2021-21373 being exploited?
There is no known exploitation of CVE-2021-21373 in the wild and no public exploit code.
Other vulnerabilities in nim-lang security
Sources
Also known as DEBIAN-CVE-2021-21373, GHSA-8w52-r35x-rgp8, UBUNTU-CVE-2021-21373.