Debian DSA-4721-1 : ruby2.5 - security update

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Debian Security Advisory DSA-4721. The text 
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('compat.inc');

if (description)
{
  script_id(138227);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/03/01");

  script_cve_id("CVE-2020-10663", "CVE-2020-10933");
  script_xref(name:"DSA", value:"4721");

  script_name(english:"Debian DSA-4721-1 : ruby2.5 - security update");

  script_set_attribute(attribute:"synopsis", value:
"The remote Debian host is missing a security-related update.");
  script_set_attribute(attribute:"description", value:
"Several vulnerabilities have been discovered in the interpreter for
the Ruby language.

  - CVE-2020-10663
    Jeremy Evans reported an unsafe object creation
    vulnerability in the json gem bundled with Ruby. When
    parsing certain JSON documents, the json gem can be
    coerced into creating arbitrary objects in the target
    system.

  - CVE-2020-10933
    Samuel Williams reported a flaw in the socket library
    which may lead to exposure of possibly sensitive data
    from the interpreter.");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2020-10663");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2020-10933");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/source-package/ruby2.5");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/buster/ruby2.5");
  script_set_attribute(attribute:"see_also", value:"https://www.debian.org/security/2020/dsa-4721");
  script_set_attribute(attribute:"solution", value:
"Upgrade the ruby2.5 packages.

For the stable distribution (buster), these problems have been fixed
in version 2.5.5-3+deb10u2.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:POC/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:H/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2020-10933");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2020-10663");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2020/04/28");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/07/08");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/07/09");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:ruby2.5");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:10.0");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2020-2024 and is owned by Tenable, Inc. or an Affiliate thereof.");

  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:"libruby2.5", reference:"2.5.5-3+deb10u2")) flag++;
if (deb_check(release:"10.0", prefix:"ruby2.5", reference:"2.5.5-3+deb10u2")) flag++;
if (deb_check(release:"10.0", prefix:"ruby2.5-dev", reference:"2.5.5-3+deb10u2")) flag++;
if (deb_check(release:"10.0", prefix:"ruby2.5-doc", reference:"2.5.5-3+deb10u2")) 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");