CVE-2022-31019 DoS Vulnerability in URLEncodedFormDecoder in Vapor

What is CVE-2022-31019?

CVE-2022-31019 is a high-severity denial of service vulnerability in vapor, published on 6 Jun 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Vapor is a server-side Swift HTTP web framework. When using automatic content decoding an attacker can craft a request body that can make the server crash with the following request: `curl -d "array[_0][0][array][_0][0][array]$(for f in $(seq 1100); do echo -n '[_0][0][array]'; done)[string][_0]=hello%20world" http://localhost:8080/foo`. The issue is unbounded, attacker controlled stack growth which will at some point lead to a stack overflow and a process crash. This issue has been fixed in version 4.61.1.

Weakness: CWE-674, CWE-120

Which versions are affected by CVE-2022-31019?

2 open source packages ship an affected version, including github.com/vapor/vapor. It affects 1 product.

Products include Vapor Vapor.

How do I fix CVE-2022-31019?

Upgrade github.com/vapor/vapor to 4.61.1 or later.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2022-31019 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2022-31019 exists.

Other vulnerabilities in vapor

• CVE-2022-31005 Integer Overflow in Vapor's HTTP Range Request High 7.5
• CVE-2024-21631 Integer overflow in URI leading to potential host spoofing Medium 6.5
• CVE-2023-44386 Incorrect request error handling triggers server crash in Vapor Medium 5.3

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-qvxg-wjxc-r4gg.