This script is Copyright (C) 2023 and is owned by Tenable, Inc. or an Affiliate thereof.AL2_ALASTOMCAT8_5-2023-012.NASLAmazon Linux 2 : tomcat (ALASTOMCAT8.5-2023-012)
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
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
Percentile
99.9%
The version of tomcat installed on the remote host is prior to 8.5.51-1. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2TOMCAT8.5-2023-012 advisory.
-
The refactoring present in Apache Tomcat 9.0.28 to 9.0.30, 8.5.48 to 8.5.50 and 7.0.98 to 7.0.99 introduced a regression. The result of the regression was that invalid Transfer-Encoding headers were incorrectly processed leading to a possibility of HTTP Request Smuggling if Tomcat was located behind a reverse proxy that incorrectly handled the invalid Transfer-Encoding header in a particular manner. Such a reverse proxy is considered unlikely. (CVE-2019-17569)
-
In Apache Tomcat 9.0.0.M1 to 9.0.30, 8.5.0 to 8.5.50 and 7.0.0 to 7.0.99 the HTTP header parsing code used an approach to end-of-line parsing that allowed some invalid HTTP headers to be parsed as valid. This led to a possibility of HTTP Request Smuggling if Tomcat was located behind a reverse proxy that incorrectly handled the invalid Transfer-Encoding header in a particular manner. Such a reverse proxy is considered unlikely. (CVE-2020-1935)
-
When using the Apache JServ Protocol (AJP), care must be taken when trusting incoming connections to Apache Tomcat. Tomcat treats AJP connections as having higher trust than, for example, a similar HTTP connection. If such connections are available to an attacker, they can be exploited in ways that may be surprising. In Apache Tomcat 9.0.0.M1 to 9.0.0.30, 8.5.0 to 8.5.50 and 7.0.0 to 7.0.99, Tomcat shipped with an AJP Connector enabled by default that listened on all configured IP addresses. It was expected (and recommended in the security guide) that this Connector would be disabled if not required. This vulnerability report identified a mechanism that allowed: - returning arbitrary files from anywhere in the web application - processing any file in the web application as a JSP Further, if the web application allowed file upload and stored those files within the web application (or the attacker was able to control the content of the web application by some other means) then this, along with the ability to process a file as a JSP, made remote code execution possible. It is important to note that mitigation is only required if an AJP port is accessible to untrusted users. Users wishing to take a defence-in-depth approach and block the vector that permits returning arbitrary files and execution as JSP may upgrade to Apache Tomcat 9.0.31, 8.5.51 or 7.0.100 or later. A number of changes were made to the default AJP Connector configuration in 9.0.31 to harden the default configuration. It is likely that users upgrading to 9.0.31, 8.5.51 or 7.0.100 or later will need to make small changes to their configurations.
(CVE-2020-1938)
Note that Nessus has not tested for these issues but has instead relied only on the application’s self-reported version number.
#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Amazon Linux 2 Security Advisory ALASTOMCAT8.5-2023-012.
##
include('compat.inc');
if (description)
{
script_id(182025);
script_version("1.2");
script_set_attribute(attribute:"plugin_modification_date", value:"2023/09/28");
script_cve_id("CVE-2019-17569", "CVE-2020-1935", "CVE-2020-1938");
script_xref(name:"CISA-KNOWN-EXPLOITED", value:"2022/03/17");
script_xref(name:"IAVA", value:"2020-A-0328");
script_xref(name:"IAVB", value:"2020-B-0010-S");
script_xref(name:"CEA-ID", value:"CEA-2020-0021");
script_name(english:"Amazon Linux 2 : tomcat (ALASTOMCAT8.5-2023-012)");
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 tomcat installed on the remote host is prior to 8.5.51-1. It is, therefore, affected by multiple
vulnerabilities as referenced in the ALAS2TOMCAT8.5-2023-012 advisory.
- The refactoring present in Apache Tomcat 9.0.28 to 9.0.30, 8.5.48 to 8.5.50 and 7.0.98 to 7.0.99
introduced a regression. The result of the regression was that invalid Transfer-Encoding headers were
incorrectly processed leading to a possibility of HTTP Request Smuggling if Tomcat was located behind a
reverse proxy that incorrectly handled the invalid Transfer-Encoding header in a particular manner. Such a
reverse proxy is considered unlikely. (CVE-2019-17569)
- In Apache Tomcat 9.0.0.M1 to 9.0.30, 8.5.0 to 8.5.50 and 7.0.0 to 7.0.99 the HTTP header parsing code used
an approach to end-of-line parsing that allowed some invalid HTTP headers to be parsed as valid. This led
to a possibility of HTTP Request Smuggling if Tomcat was located behind a reverse proxy that incorrectly
handled the invalid Transfer-Encoding header in a particular manner. Such a reverse proxy is considered
unlikely. (CVE-2020-1935)
- When using the Apache JServ Protocol (AJP), care must be taken when trusting incoming connections to
Apache Tomcat. Tomcat treats AJP connections as having higher trust than, for example, a similar HTTP
connection. If such connections are available to an attacker, they can be exploited in ways that may be
surprising. In Apache Tomcat 9.0.0.M1 to 9.0.0.30, 8.5.0 to 8.5.50 and 7.0.0 to 7.0.99, Tomcat shipped
with an AJP Connector enabled by default that listened on all configured IP addresses. It was expected
(and recommended in the security guide) that this Connector would be disabled if not required. This
vulnerability report identified a mechanism that allowed: - returning arbitrary files from anywhere in the
web application - processing any file in the web application as a JSP Further, if the web application
allowed file upload and stored those files within the web application (or the attacker was able to control
the content of the web application by some other means) then this, along with the ability to process a
file as a JSP, made remote code execution possible. It is important to note that mitigation is only
required if an AJP port is accessible to untrusted users. Users wishing to take a defence-in-depth
approach and block the vector that permits returning arbitrary files and execution as JSP may upgrade to
Apache Tomcat 9.0.31, 8.5.51 or 7.0.100 or later. A number of changes were made to the default AJP
Connector configuration in 9.0.31 to harden the default configuration. It is likely that users upgrading
to 9.0.31, 8.5.51 or 7.0.100 or later will need to make small changes to their configurations.
(CVE-2020-1938)
Note that Nessus has not tested for these issues 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/ALASTOMCAT8.5-2023-012.html");
script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/cve/html/CVE-2019-17569.html");
script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/cve/html/CVE-2020-1935.html");
script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/cve/html/CVE-2020-1938.html");
script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/faqs.html");
script_set_attribute(attribute:"solution", value:
"Run 'yum update tomcat' to update your system.");
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:H/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:H/RL:O/RC:C");
script_set_attribute(attribute:"cvss_score_source", value:"CVE-2020-1938");
script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
script_set_attribute(attribute:"exploit_available", value:"true");
script_set_attribute(attribute:"exploited_by_malware", value:"true");
script_set_attribute(attribute:"vuln_publication_date", value:"2020/02/11");
script_set_attribute(attribute:"patch_publication_date", value:"2023/08/21");
script_set_attribute(attribute:"plugin_publication_date", value:"2023/09/27");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:tomcat");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:tomcat-admin-webapps");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:tomcat-docs-webapp");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:tomcat-el-3.0-api");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:tomcat-javadoc");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:tomcat-jsp-2.3-api");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:tomcat-jsvc");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:tomcat-lib");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:tomcat-servlet-3.1-api");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:tomcat-webapps");
script_set_attribute(attribute:"cpe", value:"cpe:/o:amazon:linux:2");
script_set_attribute(attribute:"generated_plugin", value:"current");
script_set_attribute(attribute:"stig_severity", value:"I");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"Amazon Linux Local Security Checks");
script_copyright(english:"This script is Copyright (C) 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':'tomcat-8.5.51-1.amzn2', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'tomcat8.5'},
{'reference':'tomcat-admin-webapps-8.5.51-1.amzn2', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'tomcat8.5'},
{'reference':'tomcat-docs-webapp-8.5.51-1.amzn2', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'tomcat8.5'},
{'reference':'tomcat-el-3.0-api-8.5.51-1.amzn2', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'tomcat8.5'},
{'reference':'tomcat-javadoc-8.5.51-1.amzn2', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'tomcat8.5'},
{'reference':'tomcat-jsp-2.3-api-8.5.51-1.amzn2', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'tomcat8.5'},
{'reference':'tomcat-jsvc-8.5.51-1.amzn2', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'tomcat8.5'},
{'reference':'tomcat-lib-8.5.51-1.amzn2', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'tomcat8.5'},
{'reference':'tomcat-servlet-3.1-api-8.5.51-1.amzn2', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'tomcat8.5'},
{'reference':'tomcat-webapps-8.5.51-1.amzn2', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'tomcat8.5'}
];
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_HOLE,
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, "tomcat / tomcat-admin-webapps / tomcat-docs-webapp / etc");
}References
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-17569
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-1935
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-1938
alas.aws.amazon.com/AL2/ALASTOMCAT8.5-2023-012.html
alas.aws.amazon.com/cve/html/CVE-2019-17569.html
alas.aws.amazon.com/cve/html/CVE-2020-1935.html
alas.aws.amazon.com/cve/html/CVE-2020-1938.html
alas.aws.amazon.com/faqs.html
Related
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
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
Percentile
99.9%