Debian DSA-4309-1 : strongswan - security update

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Debian Security Advisory DSA-4309. The text 
# itself is copyright (C) Software in the Public Interest, Inc.
#

include("compat.inc");

if (description)
{
  script_id(117890);
  script_version("1.6");
  script_set_attribute(attribute:"plugin_modification_date", value:"2022/02/17");

  script_cve_id("CVE-2018-17540");
  script_xref(name:"DSA", value:"4309");

  script_name(english:"Debian DSA-4309-1 : strongswan - security update");
  script_summary(english:"Checks dpkg output for the updated package");

  script_set_attribute(
    attribute:"synopsis",
    value:"The remote Debian host is missing a security-related update."
  );
  script_set_attribute(
    attribute:"description",
    value:
"Google's OSS-Fuzz revealed an exploitable bug in the gmp plugin caused
by the patch that fixes CVE-2018-16151 and CVE-2018-16152
(DSA-4305-1).

An attacker could trigger it using crafted certificates with RSA keys
with very small moduli. Verifying signatures with such keys would
cause an integer underflow and subsequent heap buffer overflow
resulting in a crash of the daemon. While arbitrary code execution is
not completely ruled out because of the heap buffer overflow, due to
the form of the data written to the buffer it seems difficult to
actually exploit it in such a way."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security-tracker.debian.org/tracker/CVE-2018-16151"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security-tracker.debian.org/tracker/CVE-2018-16152"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security-tracker.debian.org/tracker/source-package/strongswan"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://packages.debian.org/source/stretch/strongswan"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.debian.org/security/2018/dsa-4309"
  );
  script_set_attribute(
    attribute:"solution",
    value:
"Upgrade the strongswan packages.

For the stable distribution (stretch), this problem has been fixed in
version 5.5.1-4+deb9u4."
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2018-17540");
  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:strongswan");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:9.0");

  script_set_attribute(attribute:"vuln_publication_date", value:"2018/10/03");
  script_set_attribute(attribute:"patch_publication_date", value:"2018/10/01");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/10/03");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2018-2022 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:"charon-cmd", reference:"5.5.1-4+deb9u4")) flag++;
if (deb_check(release:"9.0", prefix:"charon-systemd", reference:"5.5.1-4+deb9u4")) flag++;
if (deb_check(release:"9.0", prefix:"libcharon-extra-plugins", reference:"5.5.1-4+deb9u4")) flag++;
if (deb_check(release:"9.0", prefix:"libstrongswan", reference:"5.5.1-4+deb9u4")) flag++;
if (deb_check(release:"9.0", prefix:"libstrongswan-extra-plugins", reference:"5.5.1-4+deb9u4")) flag++;
if (deb_check(release:"9.0", prefix:"libstrongswan-standard-plugins", reference:"5.5.1-4+deb9u4")) flag++;
if (deb_check(release:"9.0", prefix:"strongswan", reference:"5.5.1-4+deb9u4")) flag++;
if (deb_check(release:"9.0", prefix:"strongswan-charon", reference:"5.5.1-4+deb9u4")) flag++;
if (deb_check(release:"9.0", prefix:"strongswan-ike", reference:"5.5.1-4+deb9u4")) flag++;
if (deb_check(release:"9.0", prefix:"strongswan-ikev1", reference:"5.5.1-4+deb9u4")) flag++;
if (deb_check(release:"9.0", prefix:"strongswan-ikev2", reference:"5.5.1-4+deb9u4")) flag++;
if (deb_check(release:"9.0", prefix:"strongswan-libcharon", reference:"5.5.1-4+deb9u4")) flag++;
if (deb_check(release:"9.0", prefix:"strongswan-nm", reference:"5.5.1-4+deb9u4")) flag++;
if (deb_check(release:"9.0", prefix:"strongswan-pki", reference:"5.5.1-4+deb9u4")) flag++;
if (deb_check(release:"9.0", prefix:"strongswan-scepclient", reference:"5.5.1-4+deb9u4")) flag++;
if (deb_check(release:"9.0", prefix:"strongswan-starter", reference:"5.5.1-4+deb9u4")) flag++;
if (deb_check(release:"9.0", prefix:"strongswan-swanctl", reference:"5.5.1-4+deb9u4")) 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");