CVE-2022-31019highCWE-120

CVE-2022-31019: high-severity vulnerability in vapor

DoS Vulnerability in URLEncodedFormDecoder in Vapor

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21Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 7.5epss 1.7%
In short

A flaw in Vapor's form decoder allows attackers to crash the server by sending specially crafted requests with deeply nested array structures that consume excessive stack memory. This is a denial-of-service vulnerability that can take down web applications using affected versions.

Technical detail

CVE-2022-31019 exploits unbounded stack growth in URLEncodedFormDecoder during automatic content decoding of HTTP request bodies. An attacker crafts deeply nested array parameters (CWE-120: Buffer Overflow) that cause stack exhaustion and process termination; no authentication is required and the attack vector is network-based.

Summary generated and translated by AI from the 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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
vapor · vapor
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