Fedora 27 : libgit2 (2018-7d993184f6) - Nessus

Critical Plugin ID: 118103

This page contains detailed information about the Fedora 27 : libgit2 (2018-7d993184f6) 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: 118103
Name: Fedora 27 : libgit2 (2018-7d993184f6)
Filename: fedora_2018-7d993184f6.nasl
Vulnerability Published: 2018-10-06
This Plugin Published: 2018-10-15
Last Modification Time: 2021-01-06
Plugin Version: 1.7
Plugin Type: local
Plugin Family: Fedora Local Security Checks
Dependencies: ssh_get_info.nasl
Required KB Items [?]: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list

Vulnerability Information

Severity: Critical
Vulnerability Published: 2018-10-06
Patch Published: 2018-10-14
CVE [?]: CVE-2018-17456
CPE [?]: cpe:/o:fedoraproject:fedora:27, p-cpe:/a:fedoraproject:fedora:libgit2

Synopsis

The remote Fedora host is missing a security update.

Description

Update to 0.26.7 (CVE-2018-17456)

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

Solution

Update the affected libgit2 package.

Public Exploits

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

Here's the list of publicly known exploits and PoCs for verifying the Fedora 27 : libgit2 (2018-7d993184f6) vulnerability:

Metasploit: exploit/multi/http/git_submodule_url_exec
[Malicious Git HTTP Server For CVE-2018-17456]
Exploit-DB: exploits/linux/local/45548.txt
[EDB-45548: Git Submodule - Arbitrary Code Execution (PoC)]
Exploit-DB: exploits/linux/local/45631.md
[EDB-45631: Git Submodule - Arbitrary Code Execution]
GitHub: https://github.com/799600966/CVE-2018-17456
[CVE-2018-17456]
GitHub: https://github.com/AnonymKing/CVE-2017-1000117
[CVE-2018-17456]
GitHub: https://github.com/KorayAgaya/TrivyWeb
[CVE-2018-17456]
GitHub: https://github.com/matlink/CVE-2018-17456
[CVE-2018-17456]
GitHub: https://github.com/shpik-kr/CVE-2018-17456
[CVE-2018-17456: 1-day]
GitHub: https://github.com/siddharthraopotukuchi/trivy
[CVE-2018-17456]
GitHub: https://github.com/simiyo/trivy
[CVE-2018-17456]
GitHub: https://github.com/t31m0/Vulnerability-Scanner-for-Containers
[CVE-2018-17456]
GitHub: https://github.com/umahari/security
[CVE-2018-17456]
GitHub: https://github.com/zhengjim/loophole
[CVE-2018-17456]
GitHub: https://github.com/offensive-security/exploitdb-bin-sploits/blob/master/bin-sploits/45631.zip
[EDB-45631]
GitHub: https://github.com/AnonymKing/CVE-2018-17456
[CVE-2018-17456: CVE-2018-17456漏洞复现（PoC+Exp）]
GitHub: https://github.com/back2zero/GIT_CVE_2018_17456
[CVE-2018-17456: GIT_CVE_2018_17456]

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 V2 Vector [?]: AV:N/AC:L/Au:N/C:P/I:P/A:P/E:F/RL:OF/RC:C

CVSS Base Score:	7.5 (High)
Impact Subscore:	6.4
Exploitability Subscore:	10.0
CVSS Temporal Score:	6.2 (Medium)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	6.2 (Medium)

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

CVSS Base Score:	9.8 (Critical)
Impact Subscore:	5.9
Exploitability Subscore:	3.9
CVSS Temporal Score:	9.1 (Critical)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	9.1 (Critical)

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Plugin Source

#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Fedora Security Advisory FEDORA-2018-7d993184f6.
#

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

if (description)
{
  script_id(118103);
  script_version("1.7");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/06");

  script_cve_id("CVE-2018-17456");
  script_xref(name:"FEDORA", value:"2018-7d993184f6");

  script_name(english:"Fedora 27 : libgit2 (2018-7d993184f6)");
  script_summary(english:"Checks rpm output for the updated package.");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote Fedora host is missing a security update."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"Update to 0.26.7 (CVE-2018-17456)

Note that Tenable Network Security has extracted the preceding
description block directly from the Fedora update system website.
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://bodhi.fedoraproject.org/updates/FEDORA-2018-7d993184f6"
  );
  script_set_attribute(
    attribute:"solution", 
    value:"Update the affected libgit2 package."
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:F/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:F/RL:O/RC:C");
  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_set_attribute(attribute:"metasploit_name", value:'Malicious Git HTTP Server For CVE-2018-17456');
  script_set_attribute(attribute:"exploit_framework_metasploit", value:"true");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fedoraproject:fedora:libgit2");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:fedoraproject:fedora:27");

  script_set_attribute(attribute:"vuln_publication_date", value:"2018/10/06");
  script_set_attribute(attribute:"patch_publication_date", value:"2018/10/14");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/10/15");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2018-2021 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"Fedora Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/RedHat/release", "Host/RedHat/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/RedHat/release");
if (isnull(release) || "Fedora" >!< release) audit(AUDIT_OS_NOT, "Fedora");
os_ver = pregmatch(pattern: "Fedora.*release ([0-9]+)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Fedora");
os_ver = os_ver[1];
if (! preg(pattern:"^27([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Fedora 27", "Fedora " + os_ver);

if (!get_kb_item("Host/RedHat/rpm-list")) 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, "Fedora", cpu);


flag = 0;
if (rpm_check(release:"FC27", reference:"libgit2-0.26.7-1.fc27")) flag++;


if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : rpm_report_get()
  );
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "libgit2");
}

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

Linux / Unix:
/opt/nessus/lib/nessus/plugins/fedora_2018-7d993184f6.nasl
Windows:
C:\ProgramData\Tenable\Nessus\nessus\plugins\fedora_2018-7d993184f6.nasl
Mac OS X:
/Library/Nessus/run/lib/nessus/plugins/fedora_2018-7d993184f6.nasl

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How to Run

Here is how to run the Fedora 27 : libgit2 (2018-7d993184f6) 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 Fedora Local Security Checks plugin family.
On the right side table select Fedora 27 : libgit2 (2018-7d993184f6) plugin ID 118103.
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 fedora_2018-7d993184f6.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

/opt/nessus/bin/nasl -a fedora_2018-7d993184f6.nasl -t <IP/HOST>

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

/opt/nessus/bin/nasl -T - fedora_2018-7d993184f6.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 fedora_2018-7d993184f6.nasl -t <IP/HOST>

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References

Fedora Security Update:

2018-7d993184f6

See also:

Similar and related Nessus plugins:

117957 - Debian DSA-4311-1 : git - security update
118059 - Slackware 14.0 / 14.1 / 14.2 / current : git (SSA:2018-283-01)
118083 - Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS : Git vulnerability (USN-3791-1)
118113 - openSUSE Security Update : git (openSUSE-2018-1147)
118124 - FreeBSD : Libgit2 -- multiple vulnerabilities (8c08ab4c-d06c-11e8-b35c-001b217b3468)
118169 - openSUSE Security Update : git (openSUSE-2018-1177)
118213 - Amazon Linux AMI : git (ALAS-2018-1093)
118244 - Fedora 27 : git (2018-d5139c4fd6)
118400 - Amazon Linux 2 : git (ALAS-2018-1093)
118555 - RHEL 7 : git (RHSA-2018:3408)
118859 - Oracle Linux 7 : git (ELSA-2018-3408)
119046 - CentOS 7 : git (CESA-2018:3408)
119206 - Scientific Linux Security Update : git on SL7.x x86_64 (20181031)
119516 - EulerOS 2.0 SP3 : git (EulerOS-SA-2018-1388)
119546 - openSUSE Security Update : libgit2 (openSUSE-2018-1517)
119649 - SUSE SLES12 Security Update : git (SUSE-SU-2018:4088-1)
120129 - SUSE SLED15 / SLES15 Security Update : git (SUSE-SU-2018:3150-1)
120182 - SUSE SLED15 / SLES15 Security Update : libgit2 (SUSE-SU-2018:4009-1)
120213 - Fedora 29 : git (2018-06090dff59)
120268 - Fedora 28 : git (2018-1c1a318a0b)

Version

This page has been produced using Nessus Professional 10.1.2 (#68) LINUX, Plugin set 202205072148.
Plugin file fedora_2018-7d993184f6.nasl version 1.7. For more plugins, visit the Nessus Plugin Library.

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Fedora 27 : libgit2 (2018-7d993184f6) - Nessus

Plugin Overview

Vulnerability Information

Synopsis

Description

Solution

Public Exploits

Risk Information

Plugin Source

How to Run

References

Version

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