CVE-2019-11366

NameCVE-2019-11366
DescriptionAn 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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
ReferencesDLA-1783-1, DSA-4438-1
NVD severitymedium (attack range: remote)
Debian Bugs927553

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
atftp (PTS)jessie0.7.git20120829-1vulnerable
jessie (security)0.7.git20120829-1+deb8u1fixed
stretch0.7.git20120829-3vulnerable
stretch (security)0.7.git20120829-3.1~deb9u1fixed
bullseye, sid, buster0.7.git20120829-3.1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
atftpsource(unstable)0.7.git20120829-3.1medium927553
atftpsourcejessie0.7.git20120829-1+deb8u1mediumDLA-1783-1
atftpsourcestretch0.7.git20120829-3.1~deb9u1mediumDSA-4438-1

Notes

https://pulsesecurity.co.nz/advisories/atftpd-multiple-vulnerabilities
https://sourceforge.net/p/atftp/code/ci/382f76a90b44f81fec00e2f609a94def4a5d3580/

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