CVE-2018-14404

Name	CVE-2018-14404
Description	A NULL pointer dereference vulnerability exists in the xpath.c:xmlXPathCompOpEval() function of libxml2 through 2.9.8 when parsing an invalid XPath expression in the XPATH_OP_AND or XPATH_OP_OR case. Applications processing untrusted XSL format inputs with the use of the libxml2 library may be vulnerable to a denial of service attack due to a crash of the application.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
References	DLA-1524-1
NVD severity	medium (attack range: remote)
Debian Bugs	901817

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
libxml2 (PTS)	jessie	2.9.1+dfsg1-5+deb8u6	vulnerable
	jessie (security)	2.9.1+dfsg1-5+deb8u7	fixed
	stretch (security), stretch	2.9.4+dfsg1-2.2+deb9u2	vulnerable
	buster, sid	2.9.4+dfsg1-7	vulnerable

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
libxml2	source	(unstable)	(unfixed)	medium		901817
libxml2	source	jessie	2.9.1+dfsg1-5+deb8u7	medium	DLA-1524-1

Notes

[stretch] - libxml2 <no-dsa> (Minor issue)
https://gitlab.gnome.org/GNOME/libxml2/issues/5
https://gitlab.gnome.org/GNOME/libxml2/issues/10
https://gitlab.gnome.org/GNOME/libxml2/commit/a436374994c47b12d5de1b8b1d191a098fa23594