Amazon Linux AMI : mercurial (ALAS-2017-856) - Nessus
High Plugin ID: 101273This page contains detailed information about the Amazon Linux AMI : mercurial (ALAS-2017-856) Nessus plugin including available exploits and PoCs found on GitHub, in Metasploit or Exploit-DB for verifying of this vulnerability.
Plugin Overview
ID: 101273
Name: Amazon Linux AMI : mercurial (ALAS-2017-856)
Filename: ala_ALAS-2017-856.nasl
Vulnerability Published: N/A
This Plugin Published: 2017-07-07
Last Modification Time: 2019-04-10
Plugin Version: 3.5
Plugin Type: local
Plugin Family: Amazon Linux Local Security Checks
Dependencies:
ssh_get_info.nasl
Required KB Items [?]: Host/AmazonLinux/release, Host/AmazonLinux/rpm-list, Host/local_checks_enabled
Vulnerability Information
Severity: High
Vulnerability Published: N/A
Patch Published: 2017-07-06
CVE [?]: CVE-2017-9462
CPE [?]: cpe:/o:amazon:linux, p-cpe:/a:amazon:linux:emacs-mercurial, p-cpe:/a:amazon:linux:emacs-mercurial-el, p-cpe:/a:amazon:linux:mercurial-common, p-cpe:/a:amazon:linux:mercurial-debuginfo, p-cpe:/a:amazon:linux:mercurial-python26, p-cpe:/a:amazon:linux:mercurial-python27
Synopsis
The remote Amazon Linux AMI host is missing a security update.
Description
Python debugger accessible to authorized users :
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
Run 'yum update mercurial' to update your system.
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 Amazon Linux AMI : mercurial (ALAS-2017-856) 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 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 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) |
Go back to menu.
Plugin Source
This is the ala_ALAS-2017-856.nasl nessus plugin source code. This script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Amazon Linux AMI Security Advisory ALAS-2017-856.
#
include("compat.inc");
if (description)
{
script_id(101273);
script_version("3.5");
script_cvs_date("Date: 2019/04/10 16:10:16");
script_cve_id("CVE-2017-9462");
script_xref(name:"ALAS", value:"2017-856");
script_name(english:"Amazon Linux AMI : mercurial (ALAS-2017-856)");
script_summary(english:"Checks rpm output for the updated packages");
script_set_attribute(
attribute:"synopsis",
value:"The remote Amazon Linux AMI host is missing a security update."
);
script_set_attribute(
attribute:"description",
value:
"Python debugger accessible to authorized users :
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)"
);
script_set_attribute(
attribute:"see_also",
value:"https://alas.aws.amazon.com/ALAS-2017-856.html"
);
script_set_attribute(
attribute:"solution",
value:"Run 'yum update mercurial' to update your system."
);
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:"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:amazon:linux:emacs-mercurial");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:emacs-mercurial-el");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:mercurial-common");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:mercurial-debuginfo");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:mercurial-python26");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:mercurial-python27");
script_set_attribute(attribute:"cpe", value:"cpe:/o:amazon:linux");
script_set_attribute(attribute:"patch_publication_date", value:"2017/07/06");
script_set_attribute(attribute:"plugin_publication_date", value:"2017/07/07");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_copyright(english:"This script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_family(english:"Amazon Linux Local Security Checks");
script_dependencies("ssh_get_info.nasl");
script_require_keys("Host/local_checks_enabled", "Host/AmazonLinux/release", "Host/AmazonLinux/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/AmazonLinux/release");
if (isnull(release) || !strlen(release)) audit(AUDIT_OS_NOT, "Amazon Linux");
os_ver = pregmatch(pattern: "^AL(A|\d)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Amazon Linux");
os_ver = os_ver[1];
if (os_ver != "A")
{
if (os_ver == 'A') os_ver = 'AMI';
audit(AUDIT_OS_NOT, "Amazon Linux AMI", "Amazon Linux " + os_ver);
}
if (!get_kb_item("Host/AmazonLinux/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);
flag = 0;
if (rpm_check(release:"ALA", reference:"emacs-mercurial-3.7.3-1.28.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"emacs-mercurial-el-3.7.3-1.28.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"mercurial-common-3.7.3-1.28.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"mercurial-debuginfo-3.7.3-1.28.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"mercurial-python26-3.7.3-1.28.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"mercurial-python27-3.7.3-1.28.amzn1")) 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, "emacs-mercurial / emacs-mercurial-el / mercurial-common / etc");
}
The latest version of this script can be found in these locations depending on your platform:
- Linux / Unix:
/opt/nessus/lib/nessus/plugins/ala_ALAS-2017-856.nasl
- Windows:
C:\ProgramData\Tenable\Nessus\nessus\plugins\ala_ALAS-2017-856.nasl
- Mac OS X:
/Library/Nessus/run/lib/nessus/plugins/ala_ALAS-2017-856.nasl
Go back to menu.
How to Run
Here is how to run the Amazon Linux AMI : mercurial (ALAS-2017-856) 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 Amazon Linux Local Security Checks plugin family.
- On the right side table select Amazon Linux AMI : mercurial (ALAS-2017-856) plugin ID 101273.
- 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 ala_ALAS-2017-856.nasl -t <IP/HOST>
Run the plugin with audit trail message on the console:
/opt/nessus/bin/nasl -a ala_ALAS-2017-856.nasl -t <IP/HOST>
Run the plugin with trace script execution written to the console (useful for debugging):
/opt/nessus/bin/nasl -T - ala_ALAS-2017-856.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 ala_ALAS-2017-856.nasl -t <IP/HOST>
Go back to menu.
References
ALAS | Amazon Linux Security Advisory: See also:
- https://www.tenable.com/plugins/nessus/101273
- https://alas.aws.amazon.com/ALAS-2017-856.html
- https://vulners.com/nessus/ALA_ALAS-2017-856.NASL
- 101091 - CentOS 6 / 7 : mercurial (CESA-2017:1576)
- 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 ala_ALAS-2017-856.nasl version 3.5. For more plugins, visit the Nessus Plugin Library.
Go back to menu.