CVE-2020-8277 PoC — Oracle GraalVM 资源管理错误漏洞

Source

https://github.com/masahiro331/CVE-2020-8277

Associated Vulnerability

Title: Oracle GraalVM 资源管理错误漏洞 (CVE-2020-8277)
Description:A Node.js application that allows an attacker to trigger a DNS request for a host of their choice could trigger a Denial of Service in versions < 15.2.1, < 14.15.1, and < 12.19.1 by getting the application to resolve a DNS record with a larger number of responses. This is fixed in 15.2.1, 14.15.1, and 12.19.1.

Readme

# CVE-2020-8277

For educational purposes only.

## Quick Run 
```
# clone this repository
$ git clone https://github.com/masahiro331/CVE-2020-8277

# run bind
$ docker build -t bind-local  ./bind
# Need TCP fallback
$ docker run --rm --name bind -it -p 53:53 -p 53:53/udp bind

# use "< v15.2.1" version
# If you use fixed version, build node.
$ git clone https://github.com/nodejs/node
$ git checkout df211208c0
$ ./configure
$ make -j8
$ make install

# Run PoC
$ node main.js
```

## Details

See Reference for the details.    
https://nodejs.org/en/blog/vulnerability/november-2020-security-releases/  
The advisory states that resolving a hostname that returns a large number of records will result in DoS.   


The vulnerability has read out of memory error.  
Affected line.   
https://github.com/nodejs/node/blob/1fd2c8142b611baadc973947b83c0863cb003d9d/src/cares_wrap.cc#L764

File Snapshot

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