CVE-2017-13720

high

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.

References

https://www.x.org/releases/individual/lib/libXfont2-2.0.2.tar.bz2

https://security.gentoo.org/glsa/201711-08

https://cgit.freedesktop.org/xorg/lib/libXfont/commit/?id=d1e670a4a8704b8708e493ab6155589bcd570608

https://bugzilla.suse.com/show_bug.cgi?id=1054285

https://bugzilla.redhat.com/show_bug.cgi?id=1500690

http://www.debian.org/security/2017/dsa-3995

Details

Source: Mitre, NVD

Published: 2017-10-11

Risk Information

CVSS v2

Base Score: 3.6

Vector: CVSS2#AV:L/AC:L/Au:N/C:P/I:N/A:P

Severity: Low

CVSS v3

Base Score: 7.1

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Severity: High