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)
#
# (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");
}
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-0762
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-5018
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-6325
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-6794
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-6796
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-6797
alas.aws.amazon.com/ALAS-2016-764.html