Debian DLA-2279-1 : tomcat8 security update

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Debian Security Advisory DLA-2279-1. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include("compat.inc");

if (description)
{
  script_id(138393);
  script_version("1.7");
  script_set_attribute(attribute:"plugin_modification_date", value:"2022/12/06");

  script_cve_id("CVE-2020-11996", "CVE-2020-9484");
  script_xref(name:"IAVA", value:"2020-A-0292-S");
  script_xref(name:"CEA-ID", value:"CEA-2021-0004");

  script_name(english:"Debian DLA-2279-1 : tomcat8 security update");
  script_summary(english:"Checks dpkg output for the updated packages.");

  script_set_attribute(
    attribute:"synopsis",
    value:"The remote Debian host is missing a security update."
  );
  script_set_attribute(
    attribute:"description",
    value:
"Several security vulnerabilities have been discovered in the Tomcat
servlet and JSP engine.

CVE-2020-9484

When using Apache Tomcat and an attacker is able to control the
contents and name of a file on the server; and b) the server is
configured to use the PersistenceManager with a FileStore; and c) the
PersistenceManager is configured with
sessionAttributeValueClassNameFilter='null' (the default unless a
SecurityManager is used) or a sufficiently lax filter to allow the
attacker provided object to be deserialized; and d) the attacker knows
the relative file path from the storage location used by FileStore to
the file the attacker has control over; then, using a specifically
crafted request, the attacker will be able to trigger remote code
execution via deserialization of the file under their control. Note
that all of conditions a) to d) must be true for the attack to
succeed.

CVE-2020-11996

A specially crafted sequence of HTTP/2 requests sent to Apache Tomcat
could trigger high CPU usage for several seconds. If a sufficient
number of such requests were made on concurrent HTTP/2 connections,
the server could become unresponsive.

For Debian 9 stretch, these problems have been fixed in version
8.5.54-0+deb9u2.

We recommend that you upgrade your tomcat8 packages.

For the detailed security status of tomcat8 please refer to its
security tracker page at:
https://security-tracker.debian.org/tracker/tomcat8

NOTE: Tenable Network Security has extracted the preceding description
block directly from the DLA security advisory. Tenable has attempted
to automatically clean and format it as much as possible without
introducing additional issues."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://lists.debian.org/debian-lts-announce/2020/07/msg00010.html"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://packages.debian.org/source/stretch/tomcat8"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security-tracker.debian.org/tracker/source-package/tomcat8"
  );
  script_set_attribute(attribute:"solution", value:"Upgrade the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:M/Au:N/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2020-9484");
  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libservlet3.1-java");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libservlet3.1-java-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libtomcat8-embed-java");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libtomcat8-java");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:tomcat8");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:tomcat8-admin");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:tomcat8-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:tomcat8-docs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:tomcat8-examples");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:tomcat8-user");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:9.0");

  script_set_attribute(attribute:"vuln_publication_date", value:"2020/05/20");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/07/12");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/07/14");
  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_copyright(english:"This script is Copyright (C) 2020-2022 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"Debian Local Security Checks");

  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/release")) audit(AUDIT_OS_NOT, "Debian");
if (!get_kb_item("Host/Debian/dpkg-l")) audit(AUDIT_PACKAGE_LIST_MISSING);


flag = 0;
if (deb_check(release:"9.0", prefix:"libservlet3.1-java", reference:"8.5.54-0+deb9u2")) flag++;
if (deb_check(release:"9.0", prefix:"libservlet3.1-java-doc", reference:"8.5.54-0+deb9u2")) flag++;
if (deb_check(release:"9.0", prefix:"libtomcat8-embed-java", reference:"8.5.54-0+deb9u2")) flag++;
if (deb_check(release:"9.0", prefix:"libtomcat8-java", reference:"8.5.54-0+deb9u2")) flag++;
if (deb_check(release:"9.0", prefix:"tomcat8", reference:"8.5.54-0+deb9u2")) flag++;
if (deb_check(release:"9.0", prefix:"tomcat8-admin", reference:"8.5.54-0+deb9u2")) flag++;
if (deb_check(release:"9.0", prefix:"tomcat8-common", reference:"8.5.54-0+deb9u2")) flag++;
if (deb_check(release:"9.0", prefix:"tomcat8-docs", reference:"8.5.54-0+deb9u2")) flag++;
if (deb_check(release:"9.0", prefix:"tomcat8-examples", reference:"8.5.54-0+deb9u2")) flag++;
if (deb_check(release:"9.0", prefix:"tomcat8-user", reference:"8.5.54-0+deb9u2")) flag++;

if (flag)
{
  if (report_verbosity > 0) security_warning(port:0, extra:deb_report_get());
  else security_warning(0);
  exit(0);
}
else audit(AUDIT_HOST_NOT, "affected");