Debian DLA-2614-1 : busybox security update

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Debian Security Advisory DLA-2614-1. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include("compat.inc");

if (description)
{
  script_id(148302);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/01/12");

  script_cve_id("CVE-2021-28831");

  script_name(english:"Debian DLA-2614-1 : busybox 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:
"The gunzip decompressor of Busybox, tiny utilities for small and
embedded systems, mishandled the error bit on the huft_build result
pointer, with a resultant invalid free or segmentation fault, via
malformed gzip data. 

For Debian 9 stretch, this problem has been fixed in version
1:1.22.0-19+deb9u2.

We recommend that you upgrade your busybox packages.

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

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/2021/04/msg00001.html"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://packages.debian.org/source/stretch/busybox"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security-tracker.debian.org/tracker/source-package/busybox"
  );
  script_set_attribute(attribute:"solution", value:"Upgrade the affected packages.");
  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-2021-28831");
  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:busybox");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:busybox-static");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:busybox-syslogd");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:busybox-udeb");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:udhcpc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:udhcpd");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:9.0");

  script_set_attribute(attribute:"vuln_publication_date", value:"2021/03/19");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/04/01");
  script_set_attribute(attribute:"plugin_publication_date", value:"2021/04/02");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2021-2024 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:"busybox", reference:"1:1.22.0-19+deb9u2")) flag++;
if (deb_check(release:"9.0", prefix:"busybox-static", reference:"1:1.22.0-19+deb9u2")) flag++;
if (deb_check(release:"9.0", prefix:"busybox-syslogd", reference:"1:1.22.0-19+deb9u2")) flag++;
if (deb_check(release:"9.0", prefix:"busybox-udeb", reference:"1:1.22.0-19+deb9u2")) flag++;
if (deb_check(release:"9.0", prefix:"udhcpc", reference:"1:1.22.0-19+deb9u2")) flag++;
if (deb_check(release:"9.0", prefix:"udhcpd", reference:"1:1.22.0-19+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");