Out-of-bounds Read in X.org Libxfont
CVE-2017-13720
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.1 (High). Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H.
EPSS exploit prediction
EPSS: 0.004 (38.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 38th percentile — 38.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- X.org Libxfont — versions 2.0.0, 2.0.1
Weakness classification (CWE)
References
- www.debian.org/security/2017/dsa-3995 (vendor-advisory)
- bugzilla.redhat.com/show_bug.cgi (Third Party Advisory, Issue Tracking)
- bugzilla.suse.com/show_bug.cgi (Third Party Advisory, Issue Tracking)
- www.x.org/releases/individual/lib/libXfont2-2.0.2.tar.bz2 (Vendor Advisory)
- security.gentoo.org/glsa/201711-08 (vendor-advisory)
- cgit.freedesktop.org/xorg/lib/libXfont/commit/ (Patch, Third Party Advisory)
Frequently asked questions
- What is CVE-2017-13720?
- CVE-2017-13720 is a high-severity vulnerability in X.org Libxfont, classified under Out-of-bounds Read. CVSS score: 7.1/10. Published 2017-10-11.
- How severe is CVE-2017-13720?
- High severity. CVSS v3 base score is 7.1 out of 10.