CVE-2017-13720

Publication date 5 October 2017

Last updated 25 August 2025

Ubuntu priority

Low

Why this priority?

Cvss 3 Severity Score

7.1 · High

Score breakdown

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.

Status

Package Ubuntu Release Status
libxfont 17.04 zesty
Fixed 1:2.0.1-3ubuntu0.1
16.04 LTS xenial
Fixed 1:1.5.1-1ubuntu0.16.04.3
14.04 LTS trusty
Fixed 1:1.4.7-1ubuntu0.3
libxfont1 17.04 zesty
Fixed 1:1.5.2-4ubuntu0.1
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
libxfont2 17.04 zesty Not in release
16.04 LTS xenial
Fixed 1:2.0.1-3~ubuntu16.04.2
14.04 LTS trusty Not in release

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
libxfont

Severity score breakdown

Parameter Value
Base score 7.1 · High
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact None
Availability impact High
Vector CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

References

Related Ubuntu Security Notices (USN)

    • USN-3442-1
    • libXfont vulnerabilities
    • 10 October 2017

Other references