Debian DLA-1911-1 : exim4 security update

#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Debian Security Advisory DLA-1911-1. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(128556);
  script_version("1.5");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/04/26");

  script_cve_id("CVE-2019-15846");

  script_name(english:"Debian DLA-1911-1 : exim4 security update");

  script_set_attribute(attribute:"synopsis", value:
"The remote Debian host is missing a security update.");
  script_set_attribute(attribute:"description", value:
"'Zerons' and Qualys discovered that a buffer overflow triggerable in
the TLS negotiation code of the Exim mail transport agent could result
in the execution of arbitrary code with root privileges.

For Debian 8 'Jessie', this problem has been fixed in version
4.84.2-2+deb8u6.

We recommend that you upgrade your exim4 packages.

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/2019/09/msg00004.html");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/jessie/exim4");
  script_set_attribute(attribute:"solution", value:
"Upgrade the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:POC/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:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2019-15846");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2019/09/06");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/09/06");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/09/09");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:exim4");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:exim4-base");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:exim4-config");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:exim4-daemon-heavy");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:exim4-daemon-heavy-dbg");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:exim4-daemon-light");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:exim4-daemon-light-dbg");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:exim4-dbg");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:exim4-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:eximon4");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:8.0");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Debian Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2019-2024 and is owned by Tenable, Inc. or an Affiliate thereof.");

  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:"8.0", prefix:"exim4", reference:"4.84.2-2+deb8u6")) flag++;
if (deb_check(release:"8.0", prefix:"exim4-base", reference:"4.84.2-2+deb8u6")) flag++;
if (deb_check(release:"8.0", prefix:"exim4-config", reference:"4.84.2-2+deb8u6")) flag++;
if (deb_check(release:"8.0", prefix:"exim4-daemon-heavy", reference:"4.84.2-2+deb8u6")) flag++;
if (deb_check(release:"8.0", prefix:"exim4-daemon-heavy-dbg", reference:"4.84.2-2+deb8u6")) flag++;
if (deb_check(release:"8.0", prefix:"exim4-daemon-light", reference:"4.84.2-2+deb8u6")) flag++;
if (deb_check(release:"8.0", prefix:"exim4-daemon-light-dbg", reference:"4.84.2-2+deb8u6")) flag++;
if (deb_check(release:"8.0", prefix:"exim4-dbg", reference:"4.84.2-2+deb8u6")) flag++;
if (deb_check(release:"8.0", prefix:"exim4-dev", reference:"4.84.2-2+deb8u6")) flag++;
if (deb_check(release:"8.0", prefix:"eximon4", reference:"4.84.2-2+deb8u6")) flag++;

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