Debian DSA-4850-1 : libzstd - security update

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Debian Security Advisory DSA-4850. The text 
# itself is copyright (C) Software in the Public Interest, Inc.
#

include("compat.inc");

if (description)
{
  script_id(146389);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/02/11");
  script_xref(name:"DSA", value:"4850");

  script_name(english:"Debian DSA-4850-1 : libzstd - 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:
"It was discovered that zstd, a compression utility, temporarily
exposed a world-readable version of its input even if the original
file had restrictive permissions."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=981404"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security-tracker.debian.org/tracker/source-package/libzstd"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://packages.debian.org/source/buster/libzstd"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.debian.org/security/2021/dsa-4850"
  );
  script_set_attribute(
    attribute:"solution",
    value:
"Upgrade the libzstd packages.

For the stable distribution (buster), this problem has been fixed in
version 1.3.8+dfsg-3+deb10u1."
  );
  script_set_attribute(attribute:"risk_factor", value:"High");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libzstd");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:10.0");

  script_set_attribute(attribute:"vuln_publication_date", value:"2021/02/10");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/02/10");
  script_set_attribute(attribute:"plugin_publication_date", value:"2021/02/11");
  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 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:"10.0", prefix:"libzstd-dev", reference:"1.3.8+dfsg-3+deb10u1")) flag++;
if (deb_check(release:"10.0", prefix:"libzstd1", reference:"1.3.8+dfsg-3+deb10u1")) flag++;
if (deb_check(release:"10.0", prefix:"zstd", reference:"1.3.8+dfsg-3+deb10u1")) 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");