CentOS 6 / 7 : mercurial (CESA-2017:1576) - Nessus

High Plugin ID: 101091

This page contains detailed information about the CentOS 6 / 7 : mercurial (CESA-2017:1576) 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: 101091
Name: CentOS 6 / 7 : mercurial (CESA-2017:1576)
Filename: centos_RHSA-2017-1576.nasl
Vulnerability Published: 2017-06-06
This Plugin Published: 2017-06-29
Last Modification Time: 2021-01-04
Plugin Version: 3.11
Plugin Type: local
Plugin Family: CentOS Local Security Checks
Dependencies: ssh_get_info.nasl
Required KB Items [?]: Host/CentOS/release, Host/CentOS/rpm-list, Host/local_checks_enabled

Vulnerability Information

Severity: High
Vulnerability Published: 2017-06-06
Patch Published: 2017-06-29
CVE [?]: CVE-2017-9462
CPE [?]: cpe:/o:centos:centos:6, cpe:/o:centos:centos:7, p-cpe:/a:centos:centos:emacs-mercurial, p-cpe:/a:centos:centos:emacs-mercurial-el, p-cpe:/a:centos:centos:mercurial, p-cpe:/a:centos:centos:mercurial-hgk

Synopsis

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

Description

An update for mercurial is now available for Red Hat Enterprise Linux 6 and Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Mercurial is a fast, lightweight source control management system designed for efficient handling of very large distributed projects.

Security Fix(es) :

* A flaw was found in the way 'hg serve --stdio' command in Mercurial handled command-line options. A remote, authenticated attacker could use this flaw to execute arbitrary code on the Mercurial server by using specially crafted command-line options. (CVE-2017-9462)

Solution

Update the affected mercurial packages.

Public Exploits

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

Here's the list of publicly known exploits and PoCs for verifying the CentOS 6 / 7 : mercurial (CESA-2017:1576) vulnerability:

Metasploit: exploit/linux/ssh/mercurial_ssh_exec
[Mercurial Custom hg-ssh Wrapper Remote Code Exec]

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.

Risk Information

CVSS Score Source [?]: CVE-2017-9462
CVSS V2 Vector: AV:N/AC:L/Au:S/C:C/I:C/A:C/E:F/RL:OF/RC:C

CVSS Base Score:	9.0 (High)
Impact Subscore:	10.0
Exploitability Subscore:	8.0
CVSS Temporal Score:	7.4 (High)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	7.4 (High)

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

CVSS Base Score:	8.8 (High)
Impact Subscore:	5.9
Exploitability Subscore:	2.8
CVSS Temporal Score:	8.2 (High)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	8.2 (High)

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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 Red Hat Security Advisory RHSA-2017:1576 and 
# CentOS Errata and Security Advisory 2017:1576 respectively.
#

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

if (description)
{
  script_id(101091);
  script_version("3.11");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/04");

  script_cve_id("CVE-2017-9462");
  script_xref(name:"RHSA", value:"2017:1576");

  script_name(english:"CentOS 6 / 7 : mercurial (CESA-2017:1576)");
  script_summary(english:"Checks rpm output for the updated packages");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote CentOS host is missing one or more security updates."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"An update for mercurial is now available for Red Hat Enterprise Linux
6 and Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security
impact of Important. A Common Vulnerability Scoring System (CVSS) base
score, which gives a detailed severity rating, is available for each
vulnerability from the CVE link(s) in the References section.

Mercurial is a fast, lightweight source control management system
designed for efficient handling of very large distributed projects.

Security Fix(es) :

* A flaw was found in the way 'hg serve --stdio' command in Mercurial
handled command-line options. A remote, authenticated attacker could
use this flaw to execute arbitrary code on the Mercurial server by
using specially crafted command-line options. (CVE-2017-9462)"
  );
  # https://lists.centos.org/pipermail/centos-announce/2017-June/022471.html
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?fb423136"
  );
  # https://lists.centos.org/pipermail/centos-announce/2017-June/022488.html
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?f8dc9155"
  );
  script_set_attribute(
    attribute:"solution", 
    value:"Update the affected mercurial packages."
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:C/I:C/A:C");
  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:L/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:"cvss_score_source", value:"CVE-2017-9462");
  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:'Mercurial Custom hg-ssh Wrapper Remote Code Exec');
  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:centos:centos:emacs-mercurial");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:emacs-mercurial-el");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:mercurial");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:mercurial-hgk");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:centos:centos:6");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:centos:centos:7");

  script_set_attribute(attribute:"vuln_publication_date", value:"2017/06/06");
  script_set_attribute(attribute:"patch_publication_date", value:"2017/06/29");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/06/29");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2017-2021 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"CentOS Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/CentOS/release", "Host/CentOS/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/CentOS/release");
if (isnull(release) || "CentOS" >!< release) audit(AUDIT_OS_NOT, "CentOS");
os_ver = pregmatch(pattern: "CentOS(?: Linux)? release ([0-9]+)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "CentOS");
os_ver = os_ver[1];
if (! preg(pattern:"^(6|7)([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "CentOS 6.x / 7.x", "CentOS " + os_ver);

if (!get_kb_item("Host/CentOS/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, "CentOS", cpu);


flag = 0;
if (rpm_check(release:"CentOS-6", reference:"emacs-mercurial-1.4-5.el6_9")) flag++;
if (rpm_check(release:"CentOS-6", reference:"emacs-mercurial-el-1.4-5.el6_9")) flag++;
if (rpm_check(release:"CentOS-6", reference:"mercurial-1.4-5.el6_9")) flag++;
if (rpm_check(release:"CentOS-6", reference:"mercurial-hgk-1.4-5.el6_9")) flag++;

if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"emacs-mercurial-2.6.2-7.el7_3")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"emacs-mercurial-el-2.6.2-7.el7_3")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"mercurial-2.6.2-7.el7_3")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"mercurial-hgk-2.6.2-7.el7_3")) 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, "emacs-mercurial / emacs-mercurial-el / mercurial / mercurial-hgk");
}

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

Linux / Unix:
/opt/nessus/lib/nessus/plugins/centos_RHSA-2017-1576.nasl
Windows:
C:\ProgramData\Tenable\Nessus\nessus\plugins\centos_RHSA-2017-1576.nasl
Mac OS X:
/Library/Nessus/run/lib/nessus/plugins/centos_RHSA-2017-1576.nasl

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How to Run

Here is how to run the CentOS 6 / 7 : mercurial (CESA-2017:1576) 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 CentOS Local Security Checks plugin family.
On the right side table select CentOS 6 / 7 : mercurial (CESA-2017:1576) plugin ID 101091.
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 centos_RHSA-2017-1576.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

/opt/nessus/bin/nasl -a centos_RHSA-2017-1576.nasl -t <IP/HOST>

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

/opt/nessus/bin/nasl -T - centos_RHSA-2017-1576.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 centos_RHSA-2017-1576.nasl -t <IP/HOST>

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References

RHSA | Red Hat Security Advisory:

2017:1576

See also:

Similar and related Nessus plugins:

101273 - Amazon Linux AMI : mercurial (ALAS-2017-856)
101121 - Debian DLA-1005-1 : mercurial security update
102930 - Debian DSA-3963-1 : mercurial - security update
102479 - EulerOS 2.0 SP1 : mercurial (EulerOS-SA-2017-1132)
102480 - EulerOS 2.0 SP2 : mercurial (EulerOS-SA-2017-1133)
101054 - Fedora 25 : mercurial (2017-62aacc1474)
101071 - Fedora 24 : mercurial (2017-b154ff2892)
103446 - GLSA-201709-18 : Mercurial: Multiple vulnerabilities
127335 - NewStart CGSL MAIN 4.05 : mercurial Vulnerability (NS-SA-2019-0104)
100830 - openSUSE Security Update : mercurial (openSUSE-2017-689)
101076 - Oracle Linux 6 / 7 : mercurial (ELSA-2017-1576)
101077 - RHEL 6 / 7 : mercurial (RHSA-2017:1576)
101079 - Scientific Linux Security Update : mercurial on SL6.x, SL7.x i386/x86_64 (20170627)
101487 - Virtuozzo 6 : emacs-mercurial / emacs-mercurial-el / mercurial / etc (VZLSA-2017-1576)

Version

This page has been produced using Nessus Professional 10.1.2 (#68) LINUX, Plugin set 202205072148.
Plugin file centos_RHSA-2017-1576.nasl version 3.11. For more plugins, visit the Nessus Plugin Library.

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CentOS 6 / 7 : mercurial (CESA-2017:1576) - Nessus

Plugin Overview

Vulnerability Information

Synopsis

Description

Solution

Public Exploits

Risk Information

Plugin Source

How to Run

References

Version

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