CVE-2018-12550

NameCVE-2018-12550
DescriptionWhen Eclipse Mosquitto version 1.0 to 1.5.5 (inclusive) is configured to use an ACL file, and that ACL file is empty, or contains only comments or blank lines, then Mosquitto will treat this as though no ACL file has been defined and use a default allow policy. The new behaviour is to have an empty ACL file mean that all access is denied, which is not a useful configuration but is not unexpected.
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)
ReferencesDSA-4388-1
NVD severitymedium (attack range: remote)
Debian Bugs921976

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
mosquitto (PTS)jessie1.3.4-2+deb8u1vulnerable
jessie (security)1.3.4-2+deb8u3vulnerable
stretch (security), stretch1.4.10-3+deb9u4fixed
buster1.5.7-1fixed
bullseye, sid1.6.4-1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
mosquittosource(unstable)1.5.6-1medium921976
mosquittosourcestretch1.4.10-3+deb9u3mediumDSA-4388-1

Notes

[jessie] - mosquitto <postponed> (Minor issue)
https://mosquitto.org/blog/2019/02/version-1-5-6-released/
https://mosquitto.org/files/cve/2018-12550

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