CVE-2017-13720

Name	CVE-2017-13720
Description	In the PatternMatch function in fontfile/fontdir.c in libXfont through 1.5.2 and 2.x before 2.0.2, an attacker with access to an X connection can cause a buffer over-read during pattern matching of fonts, leading to information disclosure or a crash (denial of service). This occurs because '\0' characters are incorrectly skipped in situations involving ? characters.
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-1126-1, DSA-3995-1
NVD severity	low (attack range: local)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
libxfont (PTS)	jessie (security), jessie	1:1.5.1-1+deb8u1	fixed
	stretch (security), stretch	1:2.0.1-3+deb9u1	fixed
	buster, sid	1:2.0.3-1	fixed
libxfont1 (PTS)	stretch	1:1.5.2-4	vulnerable

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

Package	Type	Release	Fixed Version	Urgency	Origin
libxfont	source	(unstable)	1:2.0.1-4	low
libxfont	source	jessie	1:1.5.1-1+deb8u1	low	DSA-3995-1
libxfont	source	stretch	1:2.0.1-3+deb9u1	low	DSA-3995-1
libxfont	source	wheezy	1:1.4.5-5+deb7u1	low	DLA-1126-1
libxfont1	source	(unstable)	(unfixed)	unimportant

Notes

Fixed by: https://cgit.freedesktop.org/xorg/lib/libXfont/commit/?id=d1e670a4a8704b8708e493ab6155589bcd570608
libxfont1 is only used by xfonts-utils, no security impact