CVE-2021-31819 Remote Code Execution in Halibut
A deserialization vulnerability in the Halibut library allows remote code execution on systems that trust each other via certificate verification.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-31819?
CVE-2021-31819 is a critical unsafe deserialization vulnerability in Octopus Deploy Halibut, published on 22 Sep 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In Halibut versions prior to 4.4.7 there is a deserialisation vulnerability that could allow remote code execution on systems that already trust each other based on certificate verification.
Weakness: CWE-502
Which versions are affected by CVE-2021-31819?
2 open source packages ship an affected version, including Halibut. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
Halibut NuGet | All versions | 4.4.7 |
Halibut NuGet | All versions | 4.4.7 |
Products include Octopus Halibut.
How do I fix CVE-2021-31819?
Upgrade Halibut to 4.4.7 or later.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2021-31819 being exploited?
There is no known exploitation of CVE-2021-31819 in the wild and no public exploit code.
Sources
Also known as GHSA-hpf7-4c2g-9chf.