7.5 High
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:P/I:P/A:P
7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
0.019 Low
EPSS
Percentile
88.5%
The version of ruby installed on the remote host is prior to 2.0.0.648-36. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2021-1641 advisory.
An issue was discovered in Ruby through 2.5.8, 2.6.x through 2.6.6, and 2.7.x through 2.7.1. WEBrick, a simple HTTP server bundled with Ruby, had not checked the transfer-encoding header value rigorously. An attacker may potentially exploit this issue to bypass a reverse proxy (which also has a poor header check), which may lead to an HTTP Request Smuggling attack. (CVE-2020-25613)
The JSON gem through 2.2.0 for Ruby, as used in Ruby 2.4 through 2.4.9, 2.5 through 2.5.7, and 2.6 through 2.6.5, has an Unsafe Object Creation Vulnerability. This is quite similar to CVE-2013-0269, but does not rely on poor garbage-collection behavior within Ruby. Specifically, use of JSON parsing methods can lead to creation of a malicious object within the interpreter, with adverse effects that are application- dependent. (CVE-2020-10663)
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)
Note that Nessus has not tested for this issue but has instead relied only on the application’s self-reported version number.
#%NASL_MIN_LEVEL 70300
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Amazon Linux 2 Security Advisory ALAS-2021-1641.
##
include('deprecated_nasl_level.inc');
include('compat.inc');
if (description)
{
script_id(149871);
script_version("1.5");
script_set_attribute(attribute:"plugin_modification_date", value:"2023/03/21");
script_cve_id("CVE-2020-10663", "CVE-2020-25613", "CVE-2021-31799");
script_xref(name:"ALAS", value:"2021-1641");
script_name(english:"Amazon Linux 2 : ruby (ALAS-2021-1641)");
script_set_attribute(attribute:"synopsis", value:
"The remote Amazon Linux 2 host is missing a security update.");
script_set_attribute(attribute:"description", value:
"The version of ruby installed on the remote host is prior to 2.0.0.648-36. It is, therefore, affected by multiple
vulnerabilities as referenced in the ALAS2-2021-1641 advisory.
- An issue was discovered in Ruby through 2.5.8, 2.6.x through 2.6.6, and 2.7.x through 2.7.1. WEBrick, a
simple HTTP server bundled with Ruby, had not checked the transfer-encoding header value rigorously. An
attacker may potentially exploit this issue to bypass a reverse proxy (which also has a poor header
check), which may lead to an HTTP Request Smuggling attack. (CVE-2020-25613)
- The JSON gem through 2.2.0 for Ruby, as used in Ruby 2.4 through 2.4.9, 2.5 through 2.5.7, and 2.6 through
2.6.5, has an Unsafe Object Creation Vulnerability. This is quite similar to CVE-2013-0269, but does not
rely on poor garbage-collection behavior within Ruby. Specifically, use of JSON parsing methods can lead
to creation of a malicious object within the interpreter, with adverse effects that are application-
dependent. (CVE-2020-10663)
- 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)
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://alas.aws.amazon.com/AL2/ALAS-2021-1641.html");
script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/../../faqs.html");
script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/cve/html/CVE-2020-10663.html");
script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/cve/html/CVE-2020-25613.html");
script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/cve/html/CVE-2021-31799.html");
script_set_attribute(attribute:"solution", value:
"Run 'yum update ruby' to update your system.");
script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/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:L/PR:N/UI:N/S:U/C:N/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-2020-25613");
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:"2013/02/11");
script_set_attribute(attribute:"patch_publication_date", value:"2021/05/20");
script_set_attribute(attribute:"plugin_publication_date", value:"2021/05/24");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:ruby");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:ruby-debuginfo");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:ruby-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:ruby-doc");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:ruby-irb");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:ruby-libs");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:ruby-tcltk");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:rubygem-bigdecimal");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:rubygem-io-console");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:rubygem-json");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:rubygem-minitest");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:rubygem-psych");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:rubygem-rake");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:rubygem-rdoc");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:rubygems");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:rubygems-devel");
script_set_attribute(attribute:"cpe", value:"cpe:/o:amazon:linux:2");
script_set_attribute(attribute:"generated_plugin", value:"current");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"Amazon Linux Local Security Checks");
script_copyright(english:"This script is Copyright (C) 2021-2023 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_dependencies("ssh_get_info.nasl");
script_require_keys("Host/local_checks_enabled", "Host/AmazonLinux/release", "Host/AmazonLinux/rpm-list");
exit(0);
}
include("rpm.inc");
if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var alas_release = get_kb_item("Host/AmazonLinux/release");
if (isnull(alas_release) || !strlen(alas_release)) audit(AUDIT_OS_NOT, "Amazon Linux");
var os_ver = pregmatch(pattern: "^AL(A|\d+|-\d+)", string:alas_release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Amazon Linux");
os_ver = os_ver[1];
if (os_ver != "2")
{
if (os_ver == 'A') os_ver = 'AMI';
audit(AUDIT_OS_NOT, "Amazon Linux 2", "Amazon Linux " + os_ver);
}
if (!get_kb_item("Host/AmazonLinux/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);
var pkgs = [
{'reference':'ruby-2.0.0.648-36.amzn2.0.2', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'ruby-2.0.0.648-36.amzn2.0.2', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'ruby-2.0.0.648-36.amzn2.0.2', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'ruby-debuginfo-2.0.0.648-36.amzn2.0.2', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'ruby-debuginfo-2.0.0.648-36.amzn2.0.2', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'ruby-debuginfo-2.0.0.648-36.amzn2.0.2', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'ruby-devel-2.0.0.648-36.amzn2.0.2', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'ruby-devel-2.0.0.648-36.amzn2.0.2', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'ruby-devel-2.0.0.648-36.amzn2.0.2', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'ruby-doc-2.0.0.648-36.amzn2.0.2', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'ruby-irb-2.0.0.648-36.amzn2.0.2', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'ruby-libs-2.0.0.648-36.amzn2.0.2', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'ruby-libs-2.0.0.648-36.amzn2.0.2', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'ruby-libs-2.0.0.648-36.amzn2.0.2', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'ruby-tcltk-2.0.0.648-36.amzn2.0.2', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'ruby-tcltk-2.0.0.648-36.amzn2.0.2', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'ruby-tcltk-2.0.0.648-36.amzn2.0.2', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'rubygem-bigdecimal-1.2.0-36.amzn2.0.2', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'rubygem-bigdecimal-1.2.0-36.amzn2.0.2', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'rubygem-bigdecimal-1.2.0-36.amzn2.0.2', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'rubygem-io-console-0.4.2-36.amzn2.0.2', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'rubygem-io-console-0.4.2-36.amzn2.0.2', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'rubygem-io-console-0.4.2-36.amzn2.0.2', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'rubygem-json-1.7.7-36.amzn2.0.2', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'rubygem-json-1.7.7-36.amzn2.0.2', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'rubygem-json-1.7.7-36.amzn2.0.2', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'rubygem-minitest-4.3.2-36.amzn2.0.2', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'rubygem-psych-2.0.0-36.amzn2.0.2', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'rubygem-psych-2.0.0-36.amzn2.0.2', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'rubygem-psych-2.0.0-36.amzn2.0.2', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'rubygem-rake-0.9.6-36.amzn2.0.2', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'rubygem-rdoc-4.0.0-36.amzn2.0.2', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'rubygems-2.0.14.1-36.amzn2.0.2', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE},
{'reference':'rubygems-devel-2.0.14.1-36.amzn2.0.2', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE}
];
var flag = 0;
foreach var package_array ( pkgs ) {
var reference = NULL;
var _release = NULL;
var sp = NULL;
var _cpu = NULL;
var el_string = NULL;
var rpm_spec_vers_cmp = NULL;
var epoch = NULL;
var allowmaj = NULL;
var exists_check = NULL;
if (!empty_or_null(package_array['reference'])) reference = package_array['reference'];
if (!empty_or_null(package_array['release'])) _release = package_array['release'];
if (!empty_or_null(package_array['sp'])) sp = package_array['sp'];
if (!empty_or_null(package_array['cpu'])) _cpu = package_array['cpu'];
if (!empty_or_null(package_array['el_string'])) el_string = package_array['el_string'];
if (!empty_or_null(package_array['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = package_array['rpm_spec_vers_cmp'];
if (!empty_or_null(package_array['epoch'])) epoch = package_array['epoch'];
if (!empty_or_null(package_array['allowmaj'])) allowmaj = package_array['allowmaj'];
if (!empty_or_null(package_array['exists_check'])) exists_check = package_array['exists_check'];
if (reference && _release && (!exists_check || rpm_exists(release:_release, rpm:exists_check))) {
if (rpm_check(release:_release, sp:sp, cpu:_cpu, reference:reference, epoch:epoch, el_string:el_string, rpm_spec_vers_cmp:rpm_spec_vers_cmp, allowmaj:allowmaj)) flag++;
}
}
if (flag)
{
security_report_v4(
port : 0,
severity : SECURITY_WARNING,
extra : rpm_report_get()
);
exit(0);
}
else
{
var tested = pkg_tests_get();
if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
else audit(AUDIT_PACKAGE_NOT_INSTALLED, "ruby / ruby-debuginfo / ruby-devel / etc");
}
Vendor | Product | Version | CPE |
---|---|---|---|
amazon | linux | ruby | p-cpe:/a:amazon:linux:ruby |
amazon | linux | ruby-debuginfo | p-cpe:/a:amazon:linux:ruby-debuginfo |
amazon | linux | ruby-devel | p-cpe:/a:amazon:linux:ruby-devel |
amazon | linux | ruby-doc | p-cpe:/a:amazon:linux:ruby-doc |
amazon | linux | ruby-irb | p-cpe:/a:amazon:linux:ruby-irb |
amazon | linux | ruby-libs | p-cpe:/a:amazon:linux:ruby-libs |
amazon | linux | ruby-tcltk | p-cpe:/a:amazon:linux:ruby-tcltk |
amazon | linux | rubygem-bigdecimal | p-cpe:/a:amazon:linux:rubygem-bigdecimal |
amazon | linux | rubygem-io-console | p-cpe:/a:amazon:linux:rubygem-io-console |
amazon | linux | rubygem-json | p-cpe:/a:amazon:linux:rubygem-json |
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-10663
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-25613
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-31799
alas.aws.amazon.com/../../faqs.html
alas.aws.amazon.com/AL2/ALAS-2021-1641.html
alas.aws.amazon.com/cve/html/CVE-2020-10663.html
alas.aws.amazon.com/cve/html/CVE-2020-25613.html
alas.aws.amazon.com/cve/html/CVE-2021-31799.html
7.5 High
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:P/I:P/A:P
7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
0.019 Low
EPSS
Percentile
88.5%