CVE-2019-11366 Information

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.

CVSS Vector

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Reference

https://lists.debian.org/debian-lts-announce/2019/05/msg00012.html https://pulsesecurity.co.nz/advisories/atftpd-multiple-vulnerabilities https://seclists.org/bugtraq/2019/May/16 https://security.gentoo.org/glsa/202003-14 https://sourceforge.net/p/atftp/code/ci/382f76a90b44f81fec00e2f609a94def4a5d3580/ https://usn.ubuntu.com/4540-1/ https://www.debian.org/security/2019/dsa-4438

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

HIGH

Base Severity

5.9