CVE ID:	CVE-2019-11366
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.
Test IDs:	None available
Cross References:	Common Vulnerability Exposure (CVE) ID: CVE-2019-11366 Bugtraq: 20190508 [SECURITY] [DSA 4438-1] atftp security update (Google Search) https://seclists.org/bugtraq/2019/May/16 Debian Security Information: DSA-4438 (Google Search) https://www.debian.org/security/2019/dsa-4438 https://security.gentoo.org/glsa/202003-14 https://pulsesecurity.co.nz/advisories/atftpd-multiple-vulnerabilities https://sourceforge.net/p/atftp/code/ci/382f76a90b44f81fec00e2f609a94def4a5d3580/ https://lists.debian.org/debian-lts-announce/2019/05/msg00012.html https://usn.ubuntu.com/4540-1/