CVE-2017-13720 Information

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.

CVSS Vector

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

Reference

http://www.debian.org/security/2017/dsa-3995 https://bugzilla.redhat.com/show_bug.cgi?id=1500690 https://bugzilla.suse.com/show_bug.cgi?id=1054285 https://cgit.freedesktop.org/xorg/lib/libXfont/commit/?id=d1e670a4a8704b8708e493ab6155589bcd570608 https://security.gentoo.org/glsa/201711-08 https://www.x.org/releases/individual/lib/libXfont2-2.0.2.tar.bz2

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

NONE

Base Score

HIGH

Base Severity

7.1