Vulnerabilities > CVE-2017-11576 - Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability in Fontforge 20161012

047910
CVSS 4.3 - MEDIUM
Attack vector
NETWORK
Attack complexity
MEDIUM
Privileges required
NONE
Confidentiality impact
NONE
Integrity impact
NONE
Availability impact
PARTIAL
network
fontforge
CWE-119
nessus
NVD
Published: 2017-07-23
Updated: 2020-01-13

Summary

FontForge 20161012 does not ensure a positive size in a weight vector memcpy call in readcfftopdict (parsettf.c) resulting in DoS via a crafted otf file.

Vulnerable Configurations

Part Description Count
Application
Fontforge
1

Common Weakness Enumeration (CWE)

Common Attack Pattern Enumeration and Classification (CAPEC)

  • Buffer Overflow via Environment Variables
    This attack pattern involves causing a buffer overflow through manipulation of environment variables. Once the attacker finds that they can modify an environment variable, they may try to overflow associated buffers. This attack leverages implicit trust often placed in environment variables.
  • Overflow Buffers
    Buffer Overflow attacks target improper or missing bounds checking on buffer operations, typically triggered by input injected by an attacker. As a consequence, an attacker is able to write past the boundaries of allocated buffer regions in memory, causing a program crash or potentially redirection of execution as per the attackers' choice.
  • Client-side Injection-induced Buffer Overflow
    This type of attack exploits a buffer overflow vulnerability in targeted client software through injection of malicious content from a custom-built hostile service.
  • Filter Failure through Buffer Overflow
    In this attack, the idea is to cause an active filter to fail by causing an oversized transaction. An attacker may try to feed overly long input strings to the program in an attempt to overwhelm the filter (by causing a buffer overflow) and hoping that the filter does not fail securely (i.e. the user input is let into the system unfiltered).
  • MIME Conversion
    An attacker exploits a weakness in the MIME conversion routine to cause a buffer overflow and gain control over the mail server machine. The MIME system is designed to allow various different information formats to be interpreted and sent via e-mail. Attack points exist when data are converted to MIME compatible format and back.

Nessus

  • NASL familyUbuntu Local Security Checks
    NASL idUBUNTU_USN-3409-1.NASL
    descriptionIt was discovered that FontForge was vulnerable to a heap-based buffer over-read. A remote attacker could use a crafted file to DoS or execute arbitrary code. (CVE-2017-11568, CVE-2017-11569, CVE-2017-11572) It was discovered that FontForge was vulnerable to a stack-based buffer overflow. A remote attacker could use a crafted file to DoS or execute arbitrary code. (CVE-2017-11571) It was discovered that FontForge was vulnerable to a heap-based buffer overflow. A remote attacker could use a crafted file to DoS or execute arbitrary code. (CVE-2017-11574) It was discovered that FontForge was vulnerable to a buffer over-read. A remote attacker could use a crafted file to DoS or execute arbitrary code. (CVE-2017-11575, CVE-2017-11577) It was discovered that FontForge wasn
    last seen2020-06-01
    modified2020-06-02
    plugin id102957
    published2017-09-05
    reporterUbuntu Security Notice (C) 2017-2019 Canonical, Inc. / NASL script (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/102957
    titleUbuntu 14.04 LTS : fontforge vulnerabilities (USN-3409-1)
    code
    #
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-3409-1. The text 
# itself is copyright (C) Canonical, Inc. See 
# <http://www.ubuntu.com/usn/>. Ubuntu(R) is a registered 
# trademark of Canonical, Inc.
#

include("compat.inc");

if (description)
{
  script_id(102957);
  script_version("3.6");
  script_cvs_date("Date: 2019/09/18 12:31:47");

  script_cve_id("CVE-2017-11568", "CVE-2017-11569", "CVE-2017-11571", "CVE-2017-11572", "CVE-2017-11574", "CVE-2017-11575", "CVE-2017-11576", "CVE-2017-11577");
  script_xref(name:"USN", value:"3409-1");

  script_name(english:"Ubuntu 14.04 LTS : fontforge vulnerabilities (USN-3409-1)");
  script_summary(english:"Checks dpkg output for updated packages.");

  script_set_attribute(
    attribute:"synopsis", 
    value:
"The remote Ubuntu host is missing one or more security-related
patches."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"It was discovered that FontForge was vulnerable to a heap-based buffer
over-read. A remote attacker could use a crafted file to DoS or
execute arbitrary code. (CVE-2017-11568, CVE-2017-11569,
CVE-2017-11572)

It was discovered that FontForge was vulnerable to a stack-based
buffer overflow. A remote attacker could use a crafted file to DoS or
execute arbitrary code. (CVE-2017-11571)

It was discovered that FontForge was vulnerable to a heap-based buffer
overflow. A remote attacker could use a crafted file to DoS or execute
arbitrary code. (CVE-2017-11574)

It was discovered that FontForge was vulnerable to a buffer over-read.
A remote attacker could use a crafted file to DoS or execute arbitrary
code. (CVE-2017-11575, CVE-2017-11577)

It was discovered that FontForge wasn't correctly checking the sign of
a vector size. A remote attacker could use a crafted file to DoS.
(CVE-2017-11576).

Note that Tenable Network Security has extracted the preceding
description block directly from the Ubuntu security advisory. Tenable
has attempted to automatically clean and format it as much as possible
without introducing additional issues."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://usn.ubuntu.com/3409-1/"
  );
  script_set_attribute(
    attribute:"solution", 
    value:"Update the affected fontforge and / or fontforge-common packages."
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:fontforge");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:fontforge-common");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:14.04");

  script_set_attribute(attribute:"vuln_publication_date", value:"2017/07/23");
  script_set_attribute(attribute:"patch_publication_date", value:"2017/09/04");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/09/05");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"Ubuntu Security Notice (C) 2017-2019 Canonical, Inc. / NASL script (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"Ubuntu Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/cpu", "Host/Ubuntu", "Host/Ubuntu/release", "Host/Debian/dpkg-l");

  exit(0);
}


include("audit.inc");
include("ubuntu.inc");
include("misc_func.inc");

if ( ! get_kb_item("Host/local_checks_enabled") ) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
release = get_kb_item("Host/Ubuntu/release");
if ( isnull(release) ) audit(AUDIT_OS_NOT, "Ubuntu");
release = chomp(release);
if (! preg(pattern:"^(14\.04)$", string:release)) audit(AUDIT_OS_NOT, "Ubuntu 14.04", "Ubuntu " + release);
if ( ! get_kb_item("Host/Debian/dpkg-l") ) audit(AUDIT_PACKAGE_LIST_MISSING);

cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Ubuntu", cpu);

flag = 0;

if (ubuntu_check(osver:"14.04", pkgname:"fontforge", pkgver:"20120731.b-5ubuntu0.1")) flag++;
if (ubuntu_check(osver:"14.04", pkgname:"fontforge-common", pkgver:"20120731.b-5ubuntu0.1")) flag++;

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    extra      : ubuntu_report_get()
  );
  exit(0);
}
else
{
  tested = ubuntu_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "fontforge / fontforge-common");
}
  • NASL familyDebian Local Security Checks
    NASL idDEBIAN_DLA-1065.NASL
    descriptionFontForge is vulnerable to heap-based buffer over-read in several functions, resulting in DoS or code execution via a crafted otf file : For Debian 7
    last seen2020-03-17
    modified2017-08-28
    plugin id102785
    published2017-08-28
    reporterThis script is Copyright (C) 2017-2020 Tenable Network Security, Inc.
    sourcehttps://www.tenable.com/plugins/nessus/102785
    titleDebian DLA-1065-1 : fontforge security update
    code
    #%NASL_MIN_LEVEL 80502
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Debian Security Advisory DLA-1065-1. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include("compat.inc");

if (description)
{
  script_id(102785);
  script_version("3.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/03/12");

  script_cve_id("CVE-2017-11568", "CVE-2017-11569", "CVE-2017-11571", "CVE-2017-11572", "CVE-2017-11574", "CVE-2017-11575", "CVE-2017-11576", "CVE-2017-11577");

  script_name(english:"Debian DLA-1065-1 : fontforge security update");
  script_summary(english:"Checks dpkg output for the updated packages.");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote Debian host is missing a security update."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"FontForge is vulnerable to heap-based buffer over-read in several
functions, resulting in DoS or code execution via a crafted otf file :

For Debian 7 'Wheezy', these problems have been fixed in version
0.0.20120101+git-2+deb7u1.

We recommend that you upgrade your fontforge packages.

NOTE: Tenable Network Security has extracted the preceding description
block directly from the DLA security advisory. Tenable has attempted
to automatically clean and format it as much as possible without
introducing additional issues."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://lists.debian.org/debian-lts-announce/2017/08/msg00017.html"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://packages.debian.org/source/wheezy/fontforge"
  );
  script_set_attribute(attribute:"solution", value:"Upgrade the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:fontforge");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:fontforge-dbg");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:fontforge-nox");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libfontforge-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libfontforge1");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libgdraw4");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:python-fontforge");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:7.0");

  script_set_attribute(attribute:"patch_publication_date", value:"2017/08/26");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/08/28");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2017-2020 Tenable Network Security, Inc.");
  script_family(english:"Debian Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/Debian/release", "Host/Debian/dpkg-l");

  exit(0);
}


include("audit.inc");
include("debian_package.inc");


if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/Debian/release")) audit(AUDIT_OS_NOT, "Debian");
if (!get_kb_item("Host/Debian/dpkg-l")) audit(AUDIT_PACKAGE_LIST_MISSING);


flag = 0;
if (deb_check(release:"7.0", prefix:"fontforge", reference:"0.0.20120101+git-2+deb7u1")) flag++;
if (deb_check(release:"7.0", prefix:"fontforge-dbg", reference:"0.0.20120101+git-2+deb7u1")) flag++;
if (deb_check(release:"7.0", prefix:"fontforge-nox", reference:"0.0.20120101+git-2+deb7u1")) flag++;
if (deb_check(release:"7.0", prefix:"libfontforge-dev", reference:"0.0.20120101+git-2+deb7u1")) flag++;
if (deb_check(release:"7.0", prefix:"libfontforge1", reference:"0.0.20120101+git-2+deb7u1")) flag++;
if (deb_check(release:"7.0", prefix:"libgdraw4", reference:"0.0.20120101+git-2+deb7u1")) flag++;
if (deb_check(release:"7.0", prefix:"python-fontforge", reference:"0.0.20120101+git-2+deb7u1")) flag++;

if (flag)
{
  if (report_verbosity > 0) security_warning(port:0, extra:deb_report_get());
  else security_warning(0);
  exit(0);
}
else audit(AUDIT_HOST_NOT, "affected");
  • NASL familyDebian Local Security Checks
    NASL idDEBIAN_DSA-3958.NASL
    descriptionIt was discovered that FontForge, a font editor, did not correctly validate its input. An attacker could use this flaw by tricking a user into opening a maliciously crafted OpenType font file, thus causing a denial-of-service via application crash, or execution of arbitrary code.
    last seen2020-06-01
    modified2020-06-02
    plugin id102825
    published2017-08-30
    reporterThis script is Copyright (C) 2017-2018 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/102825
    titleDebian DSA-3958-1 : fontforge - security update
    code
    #
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Debian Security Advisory DSA-3958. The text 
# itself is copyright (C) Software in the Public Interest, Inc.
#

include("compat.inc");

if (description)
{
  script_id(102825);
  script_version("3.3");
  script_cvs_date("Date: 2018/11/10 11:49:38");

  script_cve_id("CVE-2017-11568", "CVE-2017-11569", "CVE-2017-11571", "CVE-2017-11572", "CVE-2017-11574", "CVE-2017-11575", "CVE-2017-11576", "CVE-2017-11577");
  script_xref(name:"DSA", value:"3958");

  script_name(english:"Debian DSA-3958-1 : fontforge - security update");
  script_summary(english:"Checks dpkg output for the updated package");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote Debian host is missing a security-related update."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"It was discovered that FontForge, a font editor, did not correctly
validate its input. An attacker could use this flaw by tricking a user
into opening a maliciously crafted OpenType font file, thus causing a
denial-of-service via application crash, or execution of arbitrary
code."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=869614"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://packages.debian.org/source/jessie/fontforge"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://packages.debian.org/source/stretch/fontforge"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.debian.org/security/2017/dsa-3958"
  );
  script_set_attribute(
    attribute:"solution", 
    value:
"Upgrade the fontforge packages.

For the oldstable distribution (jessie), these problems have been
fixed in version 20120731.b-5+deb8u1.

For the stable distribution (stretch), these problems have been fixed
in version 1:20161005~dfsg-4+deb9u1."
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:fontforge");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:8.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:9.0");

  script_set_attribute(attribute:"patch_publication_date", value:"2017/08/29");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/08/30");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2017-2018 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"Debian Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/Debian/release", "Host/Debian/dpkg-l");

  exit(0);
}


include("audit.inc");
include("debian_package.inc");


if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/Debian/release")) audit(AUDIT_OS_NOT, "Debian");
if (!get_kb_item("Host/Debian/dpkg-l")) audit(AUDIT_PACKAGE_LIST_MISSING);


flag = 0;
if (deb_check(release:"8.0", prefix:"fontforge", reference:"20120731.b-5+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"fontforge-common", reference:"20120731.b-5+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"fontforge-dbg", reference:"20120731.b-5+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"fontforge-nox", reference:"20120731.b-5+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"libfontforge-dev", reference:"20120731.b-5+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"libfontforge1", reference:"20120731.b-5+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"libgdraw4", reference:"20120731.b-5+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"python-fontforge", reference:"20120731.b-5+deb8u1")) flag++;
if (deb_check(release:"9.0", prefix:"fontforge", reference:"1:20161005~dfsg-4+deb9u1")) flag++;
if (deb_check(release:"9.0", prefix:"fontforge-common", reference:"1:20161005~dfsg-4+deb9u1")) flag++;
if (deb_check(release:"9.0", prefix:"fontforge-dbg", reference:"1:20161005~dfsg-4+deb9u1")) flag++;
if (deb_check(release:"9.0", prefix:"fontforge-nox", reference:"1:20161005~dfsg-4+deb9u1")) flag++;
if (deb_check(release:"9.0", prefix:"libfontforge-dev", reference:"1:20161005~dfsg-4+deb9u1")) flag++;
if (deb_check(release:"9.0", prefix:"libfontforge2", reference:"1:20161005~dfsg-4+deb9u1")) flag++;
if (deb_check(release:"9.0", prefix:"libgdraw5", reference:"1:20161005~dfsg-4+deb9u1")) flag++;
if (deb_check(release:"9.0", prefix:"python-fontforge", reference:"1:20161005~dfsg-4+deb9u1")) flag++;

if (flag)
{
  if (report_verbosity > 0) security_warning(port:0, extra:deb_report_get());
  else security_warning(0);
  exit(0);
}
else audit(AUDIT_HOST_NOT, "affected");

References