Debian DLA-1726-1 : bash 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-1726-1. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

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

if (description)
{
  script_id(123093);
  script_version("1.5");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/11");

  script_cve_id("CVE-2016-9401", "CVE-2019-9924");

  script_name(english:"Debian DLA-1726-1 : bash 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:
"Two issues have been fixed in bash, the GNU Bourne-Again Shell :

CVE-2016-9401

The popd builtin segfaulted when called with negative out of range
offsets.

CVE-2019-9924

Sylvain Beucler discovered that it was possible to call commands that
contained a slash when in restricted mode (rbash) by adding them to
the BASH_CMDS array.

For Debian 8 'Jessie', these problems have been fixed in version
4.3-11+deb8u2.

We recommend that you upgrade your bash 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/2019/03/msg00028.html"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://packages.debian.org/source/jessie/bash"
  );
  script_set_attribute(attribute:"solution", value:"Upgrade the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC: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_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:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:bash");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:bash-builtins");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:bash-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:bash-static");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:8.0");

  script_set_attribute(attribute:"vuln_publication_date", value:"2017/01/23");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/03/25");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/03/26");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2019-2021 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:"8.0", prefix:"bash", reference:"4.3-11+deb8u2")) flag++;
if (deb_check(release:"8.0", prefix:"bash-builtins", reference:"4.3-11+deb8u2")) flag++;
if (deb_check(release:"8.0", prefix:"bash-doc", reference:"4.3-11+deb8u2")) flag++;
if (deb_check(release:"8.0", prefix:"bash-static", reference:"4.3-11+deb8u2")) 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");