Debian DLA-507-1 : nss security update (Logjam)

#%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-507-1. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

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

if (description)
{
  script_id(91505);
  script_version("2.7");
  script_set_attribute(attribute:"plugin_modification_date", value:"2022/12/05");

  script_cve_id("CVE-2015-4000");
  script_bugtraq_id(74733);
  script_xref(name:"CEA-ID", value:"CEA-2021-0004");

  script_name(english:"Debian DLA-507-1 : nss security update (Logjam)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Debian host is missing a security update.");
  script_set_attribute(attribute:"description", value:
"A vulnerability has been found in nss.

CVE-2015-4000

With TLS protocol 1.2 and earlier, when a DHE_EXPORT ciphersuite is
enabled on a server but not on a client, does not properly convey a
DHE_EXPORT choice, which allows man-in-the-middle attackers to conduct
cipher-downgrade attacks by rewriting a ClientHello with DHE replaced
by DHE_EXPORT and then rewriting a ServerHello with DHE_EXPORT
replaced by DHE, aka the 'Logjam' issue.

The solution in nss was to not accept bit lengths less than 1024. This
may potentially be a backwards incompatibility issue but such low bit
lengths should not be in use so it was deemed acceptable.

For Debian 7 'Wheezy', these problems have been fixed in version
2:3.14.5-1+deb7u7.

We recommend that you upgrade your nss 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/2016/06/msg00006.html");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/wheezy/nss");
  script_set_attribute(attribute:"solution", value:
"Upgrade the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:N/I:P/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_set_attribute(attribute:"in_the_news", value:"true");

  script_set_attribute(attribute:"patch_publication_date", value:"2016/06/07");
  script_set_attribute(attribute:"plugin_publication_date", value:"2016/06/08");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libnss3");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libnss3-1d");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libnss3-dbg");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libnss3-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libnss3-tools");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:7.0");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2016-2022 Tenable Network Security, Inc.");

  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:"7.0", prefix:"libnss3", reference:"2:3.14.5-1+deb7u7")) flag++;
if (deb_check(release:"7.0", prefix:"libnss3-1d", reference:"2:3.14.5-1+deb7u7")) flag++;
if (deb_check(release:"7.0", prefix:"libnss3-dbg", reference:"2:3.14.5-1+deb7u7")) flag++;
if (deb_check(release:"7.0", prefix:"libnss3-dev", reference:"2:3.14.5-1+deb7u7")) flag++;
if (deb_check(release:"7.0", prefix:"libnss3-tools", reference:"2:3.14.5-1+deb7u7")) 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");