Amazon Linux AMI : tomcat6 / tomcat7,tomcat8 (ALAS-2016-764)

2016-11-11T00:00:00
ID ALA_ALAS-2016-764.NASL
Type nessus
Reporter This script is Copyright (C) 2016-2018 Tenable Network Security, Inc.
Modified 2020-02-02T00:00:00

Description

It was discovered that the Tomcat packages installed certain configuration files read by the Tomcat initialization script as writeable to the tomcat group. A member of the group or a malicious web application deployed on Tomcat could use this flaw to escalate their privileges. (CVE-2016-6325)

A malicious web application was able to bypass a configured SecurityManager via a Tomcat utility method that was accessible to web applications. (CVE-2016-5018)

The Realm implementations did not process the supplied password if the supplied user name did not exist. This made a timing attack possible to determine valid user names. Note that the default configuration includes the LockOutRealm which makes exploitation of this vulnerability harder. (CVE-2016-0762)

When a SecurityManager is configured, a web application

                                        
                                            #
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Amazon Linux AMI Security Advisory ALAS-2016-764.
#

include("compat.inc");

if (description)
{
  script_id(94684);
  script_version("2.4");
  script_cvs_date("Date: 2018/04/18 15:09:36");

  script_cve_id("CVE-2016-0762", "CVE-2016-5018", "CVE-2016-6325", "CVE-2016-6794", "CVE-2016-6796", "CVE-2016-6797");
  script_xref(name:"ALAS", value:"2016-764");

  script_name(english:"Amazon Linux AMI : tomcat6 / tomcat7,tomcat8 (ALAS-2016-764)");
  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:
"It was discovered that the Tomcat packages installed certain
configuration files read by the Tomcat initialization script as
writeable to the tomcat group. A member of the group or a malicious
web application deployed on Tomcat could use this flaw to escalate
their privileges. (CVE-2016-6325)

A malicious web application was able to bypass a configured
SecurityManager via a Tomcat utility method that was accessible to web
applications. (CVE-2016-5018)

The Realm implementations did not process the supplied password if the
supplied user name did not exist. This made a timing attack possible
to determine valid user names. Note that the default configuration
includes the LockOutRealm which makes exploitation of this
vulnerability harder. (CVE-2016-0762)

When a SecurityManager is configured, a web application's ability to
read system properties should be controlled by the SecurityManager.
Tomcat's system property replacement feature for configuration files
could be used by a malicious web application to bypass the
SecurityManager and read system properties that should not be visible.
(CVE-2016-6794)

A malicious web application was able to bypass a configured
SecurityManager via manipulation of the configuration parameters for
the JSP Servlet. (CVE-2016-6796)

The ResourceLinkFactory did not limit web application access to global
JNDI resources to those resources explicitly linked to the web
application. Therefore, it was possible for a web application to
access any global JNDI resource whether an explicit ResourceLink had
been configured or not. (CVE-2016-6797)"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://alas.aws.amazon.com/ALAS-2016-764.html"
  );
  script_set_attribute(
    attribute:"solution", 
    value:
"Run 'yum update tomcat6' to update your system.

Run 'yum update tomcat7' to update your system.

Run 'yum update tomcat8' to update your system."
  );
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:tomcat6");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:tomcat6-admin-webapps");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:tomcat6-docs-webapp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:tomcat6-el-2.1-api");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:tomcat6-javadoc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:tomcat6-jsp-2.1-api");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:tomcat6-lib");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:tomcat6-servlet-2.5-api");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:tomcat6-webapps");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:tomcat7");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:tomcat7-admin-webapps");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:tomcat7-docs-webapp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:tomcat7-el-2.2-api");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:tomcat7-javadoc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:tomcat7-jsp-2.2-api");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:tomcat7-lib");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:tomcat7-log4j");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:tomcat7-servlet-3.0-api");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:tomcat7-webapps");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:tomcat8");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:tomcat8-admin-webapps");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:tomcat8-docs-webapp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:tomcat8-el-3.0-api");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:tomcat8-javadoc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:tomcat8-jsp-2.3-api");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:tomcat8-lib");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:tomcat8-log4j");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:tomcat8-servlet-3.1-api");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:tomcat8-webapps");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:amazon:linux");

  script_set_attribute(attribute:"patch_publication_date", value:"2016/11/10");
  script_set_attribute(attribute:"plugin_publication_date", value:"2016/11/11");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2016-2018 Tenable Network Security, Inc.");
  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:"tomcat6-6.0.47-1.7.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"tomcat6-admin-webapps-6.0.47-1.7.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"tomcat6-docs-webapp-6.0.47-1.7.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"tomcat6-el-2.1-api-6.0.47-1.7.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"tomcat6-javadoc-6.0.47-1.7.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"tomcat6-jsp-2.1-api-6.0.47-1.7.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"tomcat6-lib-6.0.47-1.7.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"tomcat6-servlet-2.5-api-6.0.47-1.7.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"tomcat6-webapps-6.0.47-1.7.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"tomcat7-7.0.72-1.21.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"tomcat7-admin-webapps-7.0.72-1.21.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"tomcat7-docs-webapp-7.0.72-1.21.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"tomcat7-el-2.2-api-7.0.72-1.21.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"tomcat7-javadoc-7.0.72-1.21.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"tomcat7-jsp-2.2-api-7.0.72-1.21.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"tomcat7-lib-7.0.72-1.21.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"tomcat7-log4j-7.0.72-1.21.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"tomcat7-servlet-3.0-api-7.0.72-1.21.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"tomcat7-webapps-7.0.72-1.21.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"tomcat8-8.0.38-1.65.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"tomcat8-admin-webapps-8.0.38-1.65.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"tomcat8-docs-webapp-8.0.38-1.65.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"tomcat8-el-3.0-api-8.0.38-1.65.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"tomcat8-javadoc-8.0.38-1.65.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"tomcat8-jsp-2.3-api-8.0.38-1.65.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"tomcat8-lib-8.0.38-1.65.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"tomcat8-log4j-8.0.38-1.65.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"tomcat8-servlet-3.1-api-8.0.38-1.65.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"tomcat8-webapps-8.0.38-1.65.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, "tomcat6 / tomcat6-admin-webapps / tomcat6-docs-webapp / etc");
}