CVEs-PoC/2019/CVE-2019-11366.md

### [CVE-2019-11366](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11366)
![](https://img.shields.io/static/v1?label=Product&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Vulnerability&message=n%2Fa&color=brighgreen)

### Description

An issue was discovered in atftpd in atftp 0.7.1. It does not lock the thread_list_mutex mutex before assigning the current thread data structure. As a result, the daemon is vulnerable to a denial of service attack due to a NULL pointer dereference. If thread_data is NULL when assigned to current, and modified by another thread before a certain tftpd_list.c check, there is a crash when dereferencing current->next.

### POC

#### Reference
- https://pulsesecurity.co.nz/advisories/atftpd-multiple-vulnerabilities
- https://seclists.org/bugtraq/2019/May/16

#### Github
No PoCs found on GitHub currently.