cve/2023/CVE-2023-31147.md

### [CVE-2023-31147](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-31147)
![](https://img.shields.io/static/v1?label=Product&message=c-ares&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=%3D%20%3C%201.19.1%20&color=brighgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=CWE-330%3A%20Use%20of%20Insufficiently%20Random%20Values&color=brighgreen)

### Description

c-ares is an asynchronous resolver library. When /dev/urandom or RtlGenRandom() are unavailable, c-ares uses rand() to generate random numbers used for DNS query ids. This is not a CSPRNG, and it is also not seeded by srand() so will generate predictable output. Input from the random number generator is fed into a non-compilant RC4 implementation and may not be as strong as the original RC4 implementation. No attempt is made to look for modern OS-provided CSPRNGs like arc4random() that is widely available. This issue has been fixed in version 1.19.1.

### POC

#### Reference
No PoCs from references.

#### Github
- https://github.com/fkie-cad/nvd-json-data-feeds