Ubuntu 16.04 LTS : Libcroco vulnerabilities (USN-5389-1) - Nessus

High Plugin ID: 160213

This page contains detailed information about the Ubuntu 16.04 LTS : Libcroco vulnerabilities (USN-5389-1) Nessus plugin including available exploits and PoCs found on GitHub, in Metasploit or Exploit-DB for verifying of this vulnerability.

Table Of Contents

hide

Plugin Overview
Vulnerability Information

Synopsis
Description
Solution

Public Exploits
Risk Information
Plugin Source
How to Run
References
Version

Plugin Overview

ID: 160213
Name: Ubuntu 16.04 LTS : Libcroco vulnerabilities (USN-5389-1)
Filename: ubuntu_USN-5389-1.nasl
Vulnerability Published: 2017-04-19
This Plugin Published: 2022-04-26
Last Modification Time: 2022-04-27
Plugin Version: 1.3
Plugin Type: local
Plugin Family: Ubuntu Local Security Checks
Dependencies: ssh_get_info.nasl
Required KB Items [?]: Host/cpu, Host/Debian/dpkg-l, Host/Ubuntu, Host/Ubuntu/release

Vulnerability Information

Severity: High
Vulnerability Published: 2017-04-19
Patch Published: 2022-04-26
CVE [?]: CVE-2017-7960, CVE-2017-8834, CVE-2017-8871, CVE-2020-12825
CPE [?]: cpe:/o:canonical:ubuntu_linux:16.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:libcroco3, p-cpe:/a:canonical:ubuntu_linux:libcroco3-dev, p-cpe:/a:canonical:ubuntu_linux:libcroco-tools

Synopsis

The remote Ubuntu host is missing one or more security updates.

Description

The remote Ubuntu 16.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-5389-1 advisory.

- The cr_input_new_from_uri function in cr-input.c in libcroco 0.6.11 and 0.6.12 allows remote attackers to cause a denial of service (heap-based buffer over-read) via a crafted CSS file. (CVE-2017-7960)

- The cr_tknzr_parse_comment function in cr-tknzr.c in libcroco 0.6.12 allows remote attackers to cause a denial of service (memory allocation error) via a crafted CSS file. (CVE-2017-8834)

- The cr_parser_parse_selector_core function in cr-parser.c in libcroco 0.6.12 allows remote attackers to cause a denial of service (infinite loop and CPU consumption) via a crafted CSS file. (CVE-2017-8871)

- libcroco through 0.6.13 has excessive recursion in cr_parser_parse_any_core in cr-parser.c, leading to stack consumption. (CVE-2020-12825)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Update the affected libcroco-tools, libcroco3 and / or libcroco3-dev packages.

Public Exploits

Target Network Port(s): N/A
Target Asset(s): N/A
Exploit Available: True (Exploit-DB, GitHub)
Exploit Ease: Exploits are available

Here's the list of publicly known exploits and PoCs for verifying the Ubuntu 16.04 LTS : Libcroco vulnerabilities (USN-5389-1) vulnerability:

Exploit-DB: exploits/linux/dos/42147.txt
[EDB-42147: libcroco 0.6.12 - Denial of Service]
GitHub: https://github.com/offensive-security/exploitdb-bin-sploits/blob/master/bin-sploits/42147.zip
[EDB-42147]

Before running any exploit against any system, make sure you are authorized by the owner of the target system(s) to perform such activity. In any other case, this would be considered as an illegal activity.

WARNING: Beware of using unverified exploits from sources such as GitHub or Exploit-DB. These exploits and PoCs could contain malware. For more information, see how to use exploits safely.

Risk Information

CVSS Score Source [?]: CVE-2020-12825
CVSS V2 Vector: AV:N/AC:M/Au:N/C:N/I:P/A:P/E:POC/RL:OF/RC:C

CVSS Base Score:	5.8 (Medium)
Impact Subscore:	4.9
Exploitability Subscore:	8.6
CVSS Temporal Score:	4.5 (Medium)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	4.5 (Medium)

CVSS V3 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H/E:P/RL:O/RC:C

CVSS Base Score:	7.1 (High)
Impact Subscore:	4.2
Exploitability Subscore:	2.8
CVSS Temporal Score:	6.4 (Medium)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	6.4 (Medium)

Go back to menu.

Plugin Source

#%NASL_MIN_LEVEL 70300
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-5389-1. The text
# itself is copyright (C) Canonical, Inc. See
# <https://ubuntu.com/security/notices>. Ubuntu(R) is a registered
# trademark of Canonical, Inc.
##

include('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(160213);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2022/04/27");

  script_cve_id(
    "CVE-2017-7960",
    "CVE-2017-8834",
    "CVE-2017-8871",
    "CVE-2020-12825"
  );
  script_xref(name:"USN", value:"5389-1");

  script_name(english:"Ubuntu 16.04 LTS : Libcroco vulnerabilities (USN-5389-1)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Ubuntu host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The remote Ubuntu 16.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in
the USN-5389-1 advisory.

  - The cr_input_new_from_uri function in cr-input.c in libcroco 0.6.11 and 0.6.12 allows remote attackers to
    cause a denial of service (heap-based buffer over-read) via a crafted CSS file. (CVE-2017-7960)

  - The cr_tknzr_parse_comment function in cr-tknzr.c in libcroco 0.6.12 allows remote attackers to cause a
    denial of service (memory allocation error) via a crafted CSS file. (CVE-2017-8834)

  - The cr_parser_parse_selector_core function in cr-parser.c in libcroco 0.6.12 allows remote attackers to
    cause a denial of service (infinite loop and CPU consumption) via a crafted CSS file. (CVE-2017-8871)

  - libcroco through 0.6.13 has excessive recursion in cr_parser_parse_any_core in cr-parser.c, leading to
    stack consumption. (CVE-2020-12825)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/notices/USN-5389-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected libcroco-tools, libcroco3 and / or libcroco3-dev packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:N/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2020-12825");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2017/04/19");
  script_set_attribute(attribute:"patch_publication_date", value:"2022/04/26");
  script_set_attribute(attribute:"plugin_publication_date", value:"2022/04/26");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:16.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libcroco-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libcroco3");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libcroco3-dev");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Ubuntu Local Security Checks");

  script_copyright(english:"Ubuntu Security Notice (C) 2022 Canonical, Inc. / NASL script (C) 2022 and is owned by Tenable, Inc. or an Affiliate thereof.");

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

  exit(0);
}

include('debian_package.inc');

if ( ! get_kb_item('Host/local_checks_enabled') ) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var release = get_kb_item('Host/Ubuntu/release');
if ( isnull(release) ) audit(AUDIT_OS_NOT, 'Ubuntu');
var release = chomp(release);
if (! preg(pattern:"^(16\.04)$", string:release)) audit(AUDIT_OS_NOT, 'Ubuntu 16.04', 'Ubuntu ' + release);
if ( ! get_kb_item('Host/Debian/dpkg-l') ) audit(AUDIT_PACKAGE_LIST_MISSING);

var 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);


var pkgs = [
    {'osver': '16.04', 'pkgname': 'libcroco-tools', 'pkgver': '0.6.11-1ubuntu0.1~esm1'},
    {'osver': '16.04', 'pkgname': 'libcroco3', 'pkgver': '0.6.11-1ubuntu0.1~esm1'},
    {'osver': '16.04', 'pkgname': 'libcroco3-dev', 'pkgver': '0.6.11-1ubuntu0.1~esm1'}
];

var flag = 0;
foreach package_array ( pkgs ) {
  var osver = NULL;
  var pkgname = NULL;
  var pkgver = NULL;
  if (!empty_or_null(package_array['osver'])) osver = package_array['osver'];
  if (!empty_or_null(package_array['pkgname'])) pkgname = package_array['pkgname'];
  if (!empty_or_null(package_array['pkgver'])) pkgver = package_array['pkgver'];
  if (osver && pkgname && pkgver) {
    if (ubuntu_check(osver:osver, pkgname:pkgname, pkgver:pkgver)) flag++;
  }
}

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    extra      : ubuntu_report_get()
  );
  exit(0);
}
else
{
  var tested = ubuntu_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'libcroco-tools / libcroco3 / libcroco3-dev');
}

The latest version of this script can be found in these locations depending on your platform:

Linux / Unix:
/opt/nessus/lib/nessus/plugins/ubuntu_USN-5389-1.nasl
Windows:
C:\ProgramData\Tenable\Nessus\nessus\plugins\ubuntu_USN-5389-1.nasl
Mac OS X:
/Library/Nessus/run/lib/nessus/plugins/ubuntu_USN-5389-1.nasl

Go back to menu.

How to Run

Here is how to run the Ubuntu 16.04 LTS : Libcroco vulnerabilities (USN-5389-1) as a standalone plugin via the Nessus web user interface (https://localhost:8834/):

Click to start a New Scan.
Select Advanced Scan.
Navigate to the Plugins tab.
On the top right corner click to Disable All plugins.
On the left side table select Ubuntu Local Security Checks plugin family.
On the right side table select Ubuntu 16.04 LTS : Libcroco vulnerabilities (USN-5389-1) plugin ID 160213.
Specify the target on the Settings tab and click to Save the scan.
Run the scan.

Here are a few examples of how to run the plugin in the command line. Note that the examples below demonstrate the usage on the Linux / Unix platform.

Basic usage:

/opt/nessus/bin/nasl ubuntu_USN-5389-1.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

/opt/nessus/bin/nasl -a ubuntu_USN-5389-1.nasl -t <IP/HOST>

Run the plugin with trace script execution written to the console (useful for debugging):

/opt/nessus/bin/nasl -T - ubuntu_USN-5389-1.nasl -t <IP/HOST>

Run the plugin with using a state file for the target and updating it (useful for running multiple plugins on the target):

/opt/nessus/bin/nasl -K /tmp/state ubuntu_USN-5389-1.nasl -t <IP/HOST>

Go back to menu.

References

USN | Ubuntu Security Notice:

5389-1

See also:

Similar and related Nessus plugins:

131350 - EulerOS 2.0 SP8 : libcroco (EulerOS-SA-2019-2284)
131673 - EulerOS 2.0 SP2 : libcroco (EulerOS-SA-2019-2520)
132140 - EulerOS 2.0 SP3 : libcroco (EulerOS-SA-2019-2605)
132361 - EulerOS 2.0 SP5 : libcroco (EulerOS-SA-2019-2694)
132830 - EulerOS Virtualization for ARM 64 3.0.5.0 : libcroco (EulerOS-SA-2020-1076)
135637 - EulerOS Virtualization 3.0.2.2 : libcroco (EulerOS-SA-2020-1475)
136262 - EulerOS Virtualization for ARM 64 3.0.2.0 : libcroco (EulerOS-SA-2020-1559)
126036 - openSUSE Security Update : libcroco (openSUSE-2019-1575)
137229 - openSUSE Security Update : libcroco (openSUSE-2020-780)
125873 - SUSE SLED12 / SLES12 Security Update : libcroco (SUSE-SU-2019:1468-1)
137585 - SUSE SLED15 / SLES15 Security Update : libcroco (SUSE-SU-2020:1535-1)

Version

This page has been produced using Nessus Professional 10.1.2 (#68) LINUX, Plugin set 202205072148.
Plugin file ubuntu_USN-5389-1.nasl version 1.3. For more plugins, visit the Nessus Plugin Library.

Go back to menu.

Ubuntu 16.04 LTS : Libcroco vulnerabilities (USN-5389-1) - Nessus

Plugin Overview

Vulnerability Information

Synopsis

Description

Solution

Public Exploits

Risk Information

Plugin Source

How to Run

References

Version

Nessus Plugin Library

Solving Problems with Office 365 Email from GoDaddy

Empire Module Library

CrackMapExec Module Library

Metasploit Android Modules

Top 16 Active Directory Vulnerabilities

Top 10 Vulnerabilities: Internal Infrastructure Pentest

Terminal Escape Injection

Cisco Password Cracking and Decrypting Guide

Capture Passwords using Wireshark

SSH Brute Force Attack Tool using PuTTY / Plink (ssh-putty-brute.ps1)

SMB Brute Force Attack Tool in PowerShell (SMBLogin.ps1)

Port Scanner in PowerShell (TCP/UDP)

Nessus CSV Parser and Extractor

Default Password Scanner (default-http-login-hunter.sh)