Vulnerability CVE-2019-11366
Published: 2019-04-20

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.

Type:

CWE-476

 (NULL Pointer Dereference)

CVSS2 => (AV:N/AC:M/Au:N/C:N/I:N/A:P)

CVSS Base Score
Impact Subscore
Exploitability Subscore
4.3/10
2.9/10
8.6/10
Exploit range
Attack complexity
Authentication
Remote
Medium
No required
Confidentiality impact
Integrity impact
Availability impact
None
None
Partial
Affected software
Atftp project -> Atftp 
Atftpd project -> Atftpd 

 References:
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://sourceforge.net/p/atftp/code/ci/382f76a90b44f81fec00e2f609a94def4a5d3580/
https://www.debian.org/security/2019/dsa-4438
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