NULL Pointer Dereference Affecting atftp package, versions <0.7.git20120829-3.1~0.18.04.1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UBUNTU1804-ATFTP-1011887
- published10 Sept 2020
- disclosed20 Apr 2019
Introduced: 20 Apr 2019
CVE-2019-11366 (opens in a new tab)How to fix?
Upgrade Ubuntu:18.04 atftp to version 0.7.git20120829-3.1~0.18.04.1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream atftp package and not the atftp package as distributed by Ubuntu.
See How to fix? for Ubuntu:18.04 relevant fixed versions and status.
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.
References
- http://people.ubuntu.com/~ubuntu-security/cve/CVE-2019-11366
- https://seclists.org/bugtraq/2019/May/16
- 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/