Debian DLA-2391-1 : ruby2.3 security update

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Debian Security Advisory DLA-2391-1. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('compat.inc');

if (description)
{
  script_id(141133);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/02/16");

  script_cve_id("CVE-2020-25613");

  script_name(english:"Debian DLA-2391-1 : ruby2.3 security update");

  script_set_attribute(attribute:"synopsis", value:
"The remote Debian host is missing a security update.");
  script_set_attribute(attribute:"description", value:
"A potential HTTP request smuggling vulnerability in WEBrick was
reported.

WEBrick (bundled along with ruby2.3) was too tolerant against an
invalid Transfer-Encoding header. This may lead to inconsistent
interpretation between WEBrick and some HTTP proxy servers, which may
allow the attacker to 'smuggle' a request.

For Debian 9 stretch, this problem has been fixed in version
2.3.3-1+deb9u9.

We recommend that you upgrade your ruby2.3 packages.

For the detailed security status of ruby2.3 please refer to its
security tracker page at:
https://security-tracker.debian.org/tracker/ruby2.3

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/2020/10/msg00002.html");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/stretch/ruby2.3");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/source-package/ruby2.3");
  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: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:L/PR:N/UI:N/S:U/C:N/I:H/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2020-25613");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2020/10/06");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/10/01");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/10/05");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libruby2.3");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:ruby2.3");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:ruby2.3-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:ruby2.3-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:ruby2.3-tcltk");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:9.0");
  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:"9.0", prefix:"libruby2.3", reference:"2.3.3-1+deb9u9")) flag++;
if (deb_check(release:"9.0", prefix:"ruby2.3", reference:"2.3.3-1+deb9u9")) flag++;
if (deb_check(release:"9.0", prefix:"ruby2.3-dev", reference:"2.3.3-1+deb9u9")) flag++;
if (deb_check(release:"9.0", prefix:"ruby2.3-doc", reference:"2.3.3-1+deb9u9")) flag++;
if (deb_check(release:"9.0", prefix:"ruby2.3-tcltk", reference:"2.3.3-1+deb9u9")) 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");