SUSE SLED15 / SLES15 Security Update : libcroco (SUSE-SU-2020:1535-1) - Nessus

Medium Plugin ID: 137585

This page contains detailed information about the SUSE SLED15 / SLES15 Security Update : libcroco (SUSE-SU-2020:1535-1) Nessus plugin including available exploits and PoCs found on GitHub, in Metasploit or Exploit-DB for verifying of this vulnerability.

Table Of Contents

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Plugin Overview
Vulnerability Information

Synopsis
Description
Solution

Public Exploits
Risk Information
Plugin Source
How to Run
References
Version

Plugin Overview

ID: 137585
Name: SUSE SLED15 / SLES15 Security Update : libcroco (SUSE-SU-2020:1535-1)
Filename: suse_SU-2020-1535-1.nasl
Vulnerability Published: 2017-06-12
This Plugin Published: 2020-06-18
Last Modification Time: 2020-12-21
Plugin Version: 1.4
Plugin Type: local
Plugin Family: SuSE Local Security Checks
Dependencies: ssh_get_info.nasl
Required KB Items [?]: Host/cpu, Host/local_checks_enabled, Host/SuSE/release, Host/SuSE/rpm-list

Vulnerability Information

Synopsis

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

Description

This update for libcroco fixes the following issues :

Security issues fixed :

CVE-2017-8834: Fixed denial of service (memory allocation error) via a crafted CSS file (bsc#1043898).

CVE-2017-8871: Fixed denial of service (infinite loop and CPU consumption) via a crafted CSS file (bsc#1043899).

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Solution

To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or 'zypper patch'.

Alternatively you can run the command listed for your product :

SUSE Linux Enterprise Module for Basesystem 15-SP1 :

zypper in -t patch SUSE-SLE-Module-Basesystem-15-SP1-2020-1535=1

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 SUSE SLED15 / SLES15 Security Update : libcroco (SUSE-SU-2020:1535-1) 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-2017-8871
CVSS V2 Vector: AV:N/AC:M/Au:N/C:N/I:N/A:C/E:POC/RL:OF/RC:C

CVSS Base Score:	7.1 (High)
Impact Subscore:	6.9
Exploitability Subscore:	8.6
CVSS Temporal Score:	5.6 (Medium)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	5.6 (Medium)

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

CVSS Base Score:	6.5 (Medium)
Impact Subscore:	3.6
Exploitability Subscore:	2.8
CVSS Temporal Score:	5.9 (Medium)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	5.9 (Medium)

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Plugin Source

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from SUSE update advisory SUSE-SU-2020:1535-1.
# The text itself is copyright (C) SUSE.
#

include("compat.inc");

if (description)
{
  script_id(137585);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/12/21");

  script_cve_id("CVE-2017-8834", "CVE-2017-8871");

  script_name(english:"SUSE SLED15 / SLES15 Security Update : libcroco (SUSE-SU-2020:1535-1)");
  script_summary(english:"Checks rpm output for the updated packages.");

  script_set_attribute(
    attribute:"synopsis",
    value:"The remote SUSE host is missing one or more security updates."
  );
  script_set_attribute(
    attribute:"description",
    value:
"This update for libcroco fixes the following issues :

Security issues fixed :

CVE-2017-8834: Fixed denial of service (memory allocation error) via a
crafted CSS file (bsc#1043898).

CVE-2017-8871: Fixed denial of service (infinite loop and CPU
consumption) via a crafted CSS file (bsc#1043899).

Note that Tenable Network Security has extracted the preceding
description block directly from the SUSE 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://bugzilla.suse.com/show_bug.cgi?id=1043898"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1043899"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.suse.com/security/cve/CVE-2017-8834/"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.suse.com/security/cve/CVE-2017-8871/"
  );
  # https://www.suse.com/support/update/announcement/2020/suse-su-20201535-1/
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?e872544c"
  );
  script_set_attribute(
    attribute:"solution",
    value:
"To install this SUSE Security Update use the SUSE recommended
installation methods like YaST online_update or 'zypper patch'.

Alternatively you can run the command listed for your product :

SUSE Linux Enterprise Module for Basesystem 15-SP1 :

zypper in -t patch SUSE-SLE-Module-Basesystem-15-SP1-2020-1535=1"
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:N/I:N/A:C");
  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:N/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-2017-8871");
  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:libcroco");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:libcroco-0_6");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:libcroco-0_6-3");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:libcroco-0_6-3-32bit-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:libcroco-0_6-3-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:libcroco-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:libcroco-debugsource");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:libcroco-devel");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:novell:suse_linux:15");

  script_set_attribute(attribute:"vuln_publication_date", value:"2017/06/12");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/06/04");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/06/18");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"SuSE Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/cpu", "Host/SuSE/release", "Host/SuSE/rpm-list");

  exit(0);
}


include("audit.inc");
include("global_settings.inc");
include("rpm.inc");


if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
release = get_kb_item("Host/SuSE/release");
if (isnull(release) || release !~ "^(SLED|SLES)") audit(AUDIT_OS_NOT, "SUSE");
os_ver = pregmatch(pattern: "^(SLE(S|D)\d+)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "SUSE");
os_ver = os_ver[1];
if (! preg(pattern:"^(SLED15|SLES15)$", string:os_ver)) audit(AUDIT_OS_NOT, "SUSE SLED15 / SLES15", "SUSE " + os_ver);

if (!get_kb_item("Host/SuSE/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);

cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if (cpu !~ "^i[3-6]86$" && "x86_64" >!< cpu && "s390x" >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "SUSE " + os_ver, cpu);

sp = get_kb_item("Host/SuSE/patchlevel");
if (isnull(sp)) sp = "0";
if (os_ver == "SLES15" && (! preg(pattern:"^(1)$", string:sp))) audit(AUDIT_OS_NOT, "SLES15 SP1", os_ver + " SP" + sp);
if (os_ver == "SLED15" && (! preg(pattern:"^(1)$", string:sp))) audit(AUDIT_OS_NOT, "SLED15 SP1", os_ver + " SP" + sp);


flag = 0;
if (rpm_check(release:"SLES15", sp:"1", cpu:"x86_64", reference:"libcroco-0_6-3-32bit-0.6.12-4.3.51")) flag++;
if (rpm_check(release:"SLES15", sp:"1", cpu:"x86_64", reference:"libcroco-0_6-3-32bit-debuginfo-0.6.12-4.3.51")) flag++;
if (rpm_check(release:"SLES15", sp:"1", reference:"libcroco-0.6.12-4.3.51")) flag++;
if (rpm_check(release:"SLES15", sp:"1", reference:"libcroco-0_6-3-0.6.12-4.3.51")) flag++;
if (rpm_check(release:"SLES15", sp:"1", reference:"libcroco-0_6-3-debuginfo-0.6.12-4.3.51")) flag++;
if (rpm_check(release:"SLES15", sp:"1", reference:"libcroco-debuginfo-0.6.12-4.3.51")) flag++;
if (rpm_check(release:"SLES15", sp:"1", reference:"libcroco-debugsource-0.6.12-4.3.51")) flag++;
if (rpm_check(release:"SLES15", sp:"1", reference:"libcroco-devel-0.6.12-4.3.51")) flag++;
if (rpm_check(release:"SLED15", sp:"1", cpu:"x86_64", reference:"libcroco-0_6-3-32bit-0.6.12-4.3.51")) flag++;
if (rpm_check(release:"SLED15", sp:"1", cpu:"x86_64", reference:"libcroco-0_6-3-32bit-debuginfo-0.6.12-4.3.51")) flag++;
if (rpm_check(release:"SLED15", sp:"1", reference:"libcroco-0.6.12-4.3.51")) flag++;
if (rpm_check(release:"SLED15", sp:"1", reference:"libcroco-0_6-3-0.6.12-4.3.51")) flag++;
if (rpm_check(release:"SLED15", sp:"1", reference:"libcroco-0_6-3-debuginfo-0.6.12-4.3.51")) flag++;
if (rpm_check(release:"SLED15", sp:"1", reference:"libcroco-debuginfo-0.6.12-4.3.51")) flag++;
if (rpm_check(release:"SLED15", sp:"1", reference:"libcroco-debugsource-0.6.12-4.3.51")) flag++;
if (rpm_check(release:"SLED15", sp:"1", reference:"libcroco-devel-0.6.12-4.3.51")) flag++;


if (flag)
{
  if (report_verbosity > 0) security_hole(port:0, extra:rpm_report_get());
  else security_hole(0);
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "libcroco");
}

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

Linux / Unix:
/opt/nessus/lib/nessus/plugins/suse_SU-2020-1535-1.nasl
Windows:
C:\ProgramData\Tenable\Nessus\nessus\plugins\suse_SU-2020-1535-1.nasl
Mac OS X:
/Library/Nessus/run/lib/nessus/plugins/suse_SU-2020-1535-1.nasl

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How to Run

Here is how to run the SUSE SLED15 / SLES15 Security Update : libcroco (SUSE-SU-2020:1535-1) 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 SuSE Local Security Checks plugin family.
On the right side table select SUSE SLED15 / SLES15 Security Update : libcroco (SUSE-SU-2020:1535-1) plugin ID 137585.
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 suse_SU-2020-1535-1.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

/opt/nessus/bin/nasl -a suse_SU-2020-1535-1.nasl -t <IP/HOST>

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

/opt/nessus/bin/nasl -T - suse_SU-2020-1535-1.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 suse_SU-2020-1535-1.nasl -t <IP/HOST>

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References

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)
160213 - Ubuntu 16.04 LTS : Libcroco vulnerabilities (USN-5389-1)

Version

This page has been produced using Nessus Professional 10.1.2 (#68) LINUX, Plugin set 202205072148.
Plugin file suse_SU-2020-1535-1.nasl version 1.4. For more plugins, visit the Nessus Plugin Library.

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SUSE SLED15 / SLES15 Security Update : libcroco (SUSE-SU-2020:1535-1) - Nessus

Plugin Overview

Vulnerability Information

Synopsis

Description

Solution

Public Exploits

Risk Information

Plugin Source

How to Run

References

Version

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