Debian DSA-5066-1 : ruby2.5 - security update - Nessus

High Plugin ID: 157378

This page contains detailed information about the Debian DSA-5066-1 : ruby2.5 - security update 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: 157378
Name: Debian DSA-5066-1 : ruby2.5 - security update
Filename: debian_DSA-5066.nasl
Vulnerability Published: 2021-04-21
This Plugin Published: 2022-02-04
Last Modification Time: 2022-02-04
Plugin Version: 1.2
Plugin Type: local
Plugin Family: Debian Local Security Checks
Dependencies: ssh_get_info.nasl
Required KB Items [?]: Host/Debian/dpkg-l, Host/Debian/release, Host/local_checks_enabled

Vulnerability Information

Severity: High
Vulnerability Published: 2021-04-21
Patch Published: 2022-02-03
CVE [?]: CVE-2021-28965, CVE-2021-31799, CVE-2021-31810, CVE-2021-32066, CVE-2021-41817, CVE-2021-41819
CPE [?]: cpe:/o:debian:debian_linux:10.0, p-cpe:/a:debian:debian_linux:libruby2.5, p-cpe:/a:debian:debian_linux:ruby2.5, p-cpe:/a:debian:debian_linux:ruby2.5-dev, p-cpe:/a:debian:debian_linux:ruby2.5-doc

Synopsis

The remote Debian host is missing one or more security-related updates.

Description

The remote Debian 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-5066 advisory.

- The REXML gem before 3.2.5 in Ruby before 2.6.7, 2.7.x before 2.7.3, and 3.x before 3.0.1 does not properly address XML round-trip issues. An incorrect document can be produced after parsing and serializing. (CVE-2021-28965)

- In RDoc 3.11 through 6.x before 6.3.1, as distributed with Ruby through 3.0.1, it is possible to execute arbitrary code via | and tags in a filename. (CVE-2021-31799)

- An issue was discovered in Ruby through 2.6.7, 2.7.x through 2.7.3, and 3.x through 3.0.1. A malicious FTP server can use the PASV response to trick Net::FTP into connecting back to a given IP address and port. This potentially makes curl extract information about services that are otherwise private and not disclosed (e.g., the attacker can conduct port scans and service banner extractions). (CVE-2021-31810)

- An issue was discovered in Ruby through 2.6.7, 2.7.x through 2.7.3, and 3.x through 3.0.1. Net::IMAP does not raise an exception when StartTLS fails with an an unknown response, which might allow man-in-the- middle attackers to bypass the TLS protections by leveraging a network position between the client and the registry to block the StartTLS command, aka a StartTLS stripping attack. (CVE-2021-32066)

- Date.parse in the date gem through 3.2.0 for Ruby allows ReDoS (regular expression Denial of Service) via a long string. The fixed versions are 3.2.1, 3.1.2, 3.0.2, and 2.0.1. (CVE-2021-41817)

- CGI::Cookie.parse in Ruby through 2.6.8 mishandles security prefixes in cookie names. This also affects the CGI gem through 0.3.0 for Ruby. (CVE-2021-41819)

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

Solution

Upgrade the ruby2.5 packages.

Public Exploits

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

Here's the list of publicly known exploits and PoCs for verifying the Debian DSA-5066-1 : ruby2.5 - security update vulnerability:

GitHub: https://github.com/Tabll/gemnasium-db
[CVE-2021-28965]
GitHub: https://github.com/sonatype-nexus-community/chelsea
[CVE-2021-28965]
GitHub: https://github.com/AlAIAL90/CVE-2021-31799
[CVE-2021-31799: PoC for exploiting CVE-2021-31799 : In RDoc 3.11 through 6.x before 6.3.1, as ...]
GitHub: https://github.com/EdgeSecurityTeam/Vulnerability
[CVE-2021-31799]
GitHub: https://github.com/lifeparticle/Ruby-Cheatsheet
[CVE-2021-31810]
GitHub: https://github.com/lifeparticle/Ruby-Cheatsheet
[CVE-2021-41817]
GitHub: https://github.com/lifeparticle/Ruby-Cheatsheet
[CVE-2021-41819]

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-2021-32066
CVSS V2 Vector: AV:N/AC:M/Au:N/C:P/I:P/A:N/E:U/RL:OF/RC:C

CVSS Base Score:	5.8 (Medium)
Impact Subscore:	4.9
Exploitability Subscore:	8.6
CVSS Temporal Score:	4.3 (Medium)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	4.3 (Medium)

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

CVSS Base Score:	7.4 (High)
Impact Subscore:	5.2
Exploitability Subscore:	2.2
CVSS Temporal Score:	6.4 (Medium)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	6.4 (Medium)

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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 Debian Security Advisory dsa-5066. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

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

if (description)
{
  script_id(157378);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2022/02/04");

  script_cve_id(
    "CVE-2021-28965",
    "CVE-2021-31799",
    "CVE-2021-31810",
    "CVE-2021-32066",
    "CVE-2021-41817",
    "CVE-2021-41819"
  );

  script_name(english:"Debian DSA-5066-1 : ruby2.5 - security update");

  script_set_attribute(attribute:"synopsis", value:
"The remote Debian host is missing one or more security-related updates.");
  script_set_attribute(attribute:"description", value:
"The remote Debian 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the
dsa-5066 advisory.

  - The REXML gem before 3.2.5 in Ruby before 2.6.7, 2.7.x before 2.7.3, and 3.x before 3.0.1 does not
    properly address XML round-trip issues. An incorrect document can be produced after parsing and
    serializing. (CVE-2021-28965)

  - In RDoc 3.11 through 6.x before 6.3.1, as distributed with Ruby through 3.0.1, it is possible to execute
    arbitrary code via | and tags in a filename. (CVE-2021-31799)

  - An issue was discovered in Ruby through 2.6.7, 2.7.x through 2.7.3, and 3.x through 3.0.1. A malicious FTP
    server can use the PASV response to trick Net::FTP into connecting back to a given IP address and port.
    This potentially makes curl extract information about services that are otherwise private and not
    disclosed (e.g., the attacker can conduct port scans and service banner extractions). (CVE-2021-31810)

  - An issue was discovered in Ruby through 2.6.7, 2.7.x through 2.7.3, and 3.x through 3.0.1. Net::IMAP does
    not raise an exception when StartTLS fails with an an unknown response, which might allow man-in-the-
    middle attackers to bypass the TLS protections by leveraging a network position between the client and the
    registry to block the StartTLS command, aka a StartTLS stripping attack. (CVE-2021-32066)

  - Date.parse in the date gem through 3.2.0 for Ruby allows ReDoS (regular expression Denial of Service) via
    a long string. The fixed versions are 3.2.1, 3.1.2, 3.0.2, and 2.0.1. (CVE-2021-41817)

  - CGI::Cookie.parse in Ruby through 2.6.8 mishandles security prefixes in cookie names. This also affects
    the CGI gem through 0.3.0 for Ruby. (CVE-2021-41819)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/source-package/ruby2.5");
  script_set_attribute(attribute:"see_also", value:"https://www.debian.org/security/2022/dsa-5066");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2021-28965");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2021-31799");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2021-31810");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2021-32066");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2021-41817");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2021-41819");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/buster/ruby2.5");
  script_set_attribute(attribute:"solution", value:
"Upgrade the ruby2.5 packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-32066");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"vuln_publication_date", value:"2021/04/21");
  script_set_attribute(attribute:"patch_publication_date", value:"2022/02/03");
  script_set_attribute(attribute:"plugin_publication_date", value:"2022/02/04");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libruby2.5");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:ruby2.5");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:ruby2.5-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:ruby2.5-doc");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:10.0");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2022 and is owned by Tenable, Inc. or an Affiliate thereof.");

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

  exit(0);
}

include('audit.inc');
include('debian_package.inc');

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/Debian/dpkg-l")) audit(AUDIT_PACKAGE_LIST_MISSING);

var release = get_kb_item('Host/Debian/release');
if ( isnull(release) ) audit(AUDIT_OS_NOT, 'Debian');
var release = chomp(release);
if (! preg(pattern:"^(10)\.[0-9]+", string:release)) audit(AUDIT_OS_NOT, 'Debian 10.0', 'Debian ' + release);
var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Debian', cpu);

var pkgs = [
    {'release': '10.0', 'prefix': 'libruby2.5', 'reference': '2.5.5-3+deb10u4'},
    {'release': '10.0', 'prefix': 'ruby2.5', 'reference': '2.5.5-3+deb10u4'},
    {'release': '10.0', 'prefix': 'ruby2.5-dev', 'reference': '2.5.5-3+deb10u4'},
    {'release': '10.0', 'prefix': 'ruby2.5-doc', 'reference': '2.5.5-3+deb10u4'}
];

var flag = 0;
foreach package_array ( pkgs ) {
  var release = NULL;
  var prefix = NULL;
  var reference = NULL;
  if (!empty_or_null(package_array['release'])) release = package_array['release'];
  if (!empty_or_null(package_array['prefix'])) prefix = package_array['prefix'];
  if (!empty_or_null(package_array['reference'])) reference = package_array['reference'];
  if (release && prefix && reference) {
    if (deb_check(release:release, prefix:prefix, reference:reference)) flag++;
  }
}

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    extra      : deb_report_get()
  );
  exit(0);
}
else
{
  var tested = deb_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'libruby2.5 / ruby2.5 / ruby2.5-dev / ruby2.5-doc');
}

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

Linux / Unix:
/opt/nessus/lib/nessus/plugins/debian_DSA-5066.nasl
Windows:
C:\ProgramData\Tenable\Nessus\nessus\plugins\debian_DSA-5066.nasl
Mac OS X:
/Library/Nessus/run/lib/nessus/plugins/debian_DSA-5066.nasl

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How to Run

Here is how to run the Debian DSA-5066-1 : ruby2.5 - security update 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 Debian Local Security Checks plugin family.
On the right side table select Debian DSA-5066-1 : ruby2.5 - security update plugin ID 157378.
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 debian_DSA-5066.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

/opt/nessus/bin/nasl -a debian_DSA-5066.nasl -t <IP/HOST>

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

/opt/nessus/bin/nasl -T - debian_DSA-5066.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 debian_DSA-5066.nasl -t <IP/HOST>

Go back to menu.

References

See also:

Similar and related Nessus plugins:

153504 - Photon OS 4.0: Ruby PHSA-2021-4.0-0096
153513 - RHEL 7 : rh-ruby27-ruby (RHSA-2021:3559)
153649 - EulerOS 2.0 SP8 : ruby (EulerOS-SA-2021-2486)
154114 - Debian DLA-2780-1 : ruby2.3 - LTS security update
154437 - RHEL 7 : rh-ruby30-ruby (RHSA-2021:3982)
154785 - EulerOS 2.0 SP8 : ruby (EulerOS-SA-2021-2643)
155246 - EulerOS 2.0 SP9 : ruby (EulerOS-SA-2021-2696)
155258 - EulerOS 2.0 SP9 : ruby (EulerOS-SA-2021-2721)
155275 - EulerOS 2.0 SP5 : ruby (EulerOS-SA-2021-2673)
155775 - openSUSE 15 Security Update : ruby2.5 (openSUSE-SU-2021:3838-1)
155800 - SUSE SLED12 / SLES12 Security Update : ruby2.1 (SUSE-SU-2021:3837-1)
155810 - SUSE SLED15 / SLES15 Security Update : ruby2.5 (SUSE-SU-2021:3838-1)
155872 - openSUSE 15 Security Update : ruby2.5 (openSUSE-SU-2021:1535-1)
156329 - Debian DLA-2853-1 : ruby2.3 - LTS security update
156376 - EulerOS Virtualization 3.0.2.0 : ruby (EulerOS-SA-2021-2846)
156519 - EulerOS Virtualization 3.0.2.6 : ruby (EulerOS-SA-2021-2866)
156802 - Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 21.04 / 21.10 : Ruby vulnerabilities (USN-5235-1)
157380 - Debian DSA-5067-1 : ruby2.7 - security update
157748 - Rocky Linux 8 : ruby:2.7 (RLSA-2021:2584)
157798 - Rocky Linux 8 : ruby:2.6 (RLSA-2021:2588)
157806 - Rocky Linux 8 : ruby:2.5 (RLSA-2021:2587)
157975 - EulerOS Virtualization 3.0.6.6 : ruby (EulerOS-SA-2022-1144)
158000 - EulerOS Virtualization 3.0.6.0 : ruby (EulerOS-SA-2022-1093)
158114 - Oracle Linux 8 : ruby:2.6 (ELSA-2022-0543)
158117 - CentOS 8 : ruby:2.6 (CESA-2022:0543)
158120 - RHEL 8 : ruby:2.6 (RHSA-2022:0544)
158132 - RHEL 8 : ruby:2.6 (RHSA-2022:0543)
158215 - RHEL 8 : ruby:2.6 (RHSA-2022:0582)
158216 - RHEL 8 : ruby:2.6 (RHSA-2022:0581)
158290 - EulerOS 2.0 SP3 : ruby (EulerOS-SA-2022-1187)
158354 - RHEL 8 : ruby:2.5 (RHSA-2022:0672)
158435 - CentOS 8 : ruby:2.5 (CESA-2022:0672)
158464 - RHEL 7 : rh-ruby26-ruby (RHSA-2022:0708)
158467 - Oracle Linux 8 : ruby:2.5 (ELSA-2022-0672)

Version

This page has been produced using Nessus Professional 10.1.2 (#68) LINUX, Plugin set 202205072148.
Plugin file debian_DSA-5066.nasl version 1.2. For more plugins, visit the Nessus Plugin Library.

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Debian DSA-5066-1 : ruby2.5 - security update - Nessus

Plugin Overview

Vulnerability Information

Synopsis

Description

Solution

Public Exploits

Risk Information

Plugin Source

How to Run

References

Version

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