Vulnerabilities > CVE-2014-6438 - Resource Management Errors vulnerability in Ruby-Lang Ruby

047910
CVSS 7.5 - HIGH
Attack vector
NETWORK
Attack complexity
LOW
Privileges required
NONE
Confidentiality impact
NONE
Integrity impact
NONE
Availability impact
HIGH
network
low complexity
ruby-lang
CWE-399
nessus

Summary

The URI.decode_www_form_component method in Ruby before 1.9.2-p330 allows remote attackers to cause a denial of service (catastrophic regular expression backtracking, resource consumption, or application crash) via a crafted string.

Vulnerable Configurations

Part Description Count
Application
Ruby-Lang
856

Common Weakness Enumeration (CWE)

Nessus

NASL familyDebian Local Security Checks
NASL idDEBIAN_DLA-275.NASL
descriptionIt was discovered that the uri package in the Ruby standard library uses regular expressions that may result in excessive backtracking. Ruby applications that parse untrusted URIs using this library were susceptible to denial of service attacks by passing crafted URIs. For the oldoldstable distribution (squeeze), this problem has been fixed in version 1.9.2.0-2+deb6u6. The oldstable distribution (wheezy) and stable distribution (jessie) were not affected by this problem as it was fixed before release. 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.
last seen2020-03-17
modified2015-07-20
plugin id84833
published2015-07-20
reporterThis script is Copyright (C) 2015-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
sourcehttps://www.tenable.com/plugins/nessus/84833
titleDebian DLA-275-1 : ruby1.9.1 security update
code
#%NASL_MIN_LEVEL 80502
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Debian Security Advisory DLA-275-1. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include("compat.inc");

if (description)
{
  script_id(84833);
  script_version("2.8");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/03/12");

  script_cve_id("CVE-2014-6438");

  script_name(english:"Debian DLA-275-1 : ruby1.9.1 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:
"It was discovered that the uri package in the Ruby standard library
uses regular expressions that may result in excessive backtracking.
Ruby applications that parse untrusted URIs using this library were
susceptible to denial of service attacks by passing crafted URIs.

For the oldoldstable distribution (squeeze), this problem has been
fixed in version 1.9.2.0-2+deb6u6.

The oldstable distribution (wheezy) and stable distribution (jessie)
were not affected by this problem as it was fixed before release.

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/2015/07/msg00014.html"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://packages.debian.org/source/squeeze-lts/ruby1.9.1"
  );
  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:"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:libruby1.9.1");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libruby1.9.1-dbg");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libtcltk-ruby1.9.1");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:ri1.9.1");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:ruby1.9.1");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:ruby1.9.1-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:ruby1.9.1-elisp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:ruby1.9.1-examples");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:ruby1.9.1-full");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:6.0");

  script_set_attribute(attribute:"patch_publication_date", value:"2015/07/19");
  script_set_attribute(attribute:"plugin_publication_date", value:"2015/07/20");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2015-2020 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:"6.0", prefix:"libruby1.9.1", reference:"1.9.2.0-2+deb6u6")) flag++;
if (deb_check(release:"6.0", prefix:"libruby1.9.1-dbg", reference:"1.9.2.0-2+deb6u6")) flag++;
if (deb_check(release:"6.0", prefix:"libtcltk-ruby1.9.1", reference:"1.9.2.0-2+deb6u6")) flag++;
if (deb_check(release:"6.0", prefix:"ri1.9.1", reference:"1.9.2.0-2+deb6u6")) flag++;
if (deb_check(release:"6.0", prefix:"ruby1.9.1", reference:"1.9.2.0-2+deb6u6")) flag++;
if (deb_check(release:"6.0", prefix:"ruby1.9.1-dev", reference:"1.9.2.0-2+deb6u6")) flag++;
if (deb_check(release:"6.0", prefix:"ruby1.9.1-elisp", reference:"1.9.2.0-2+deb6u6")) flag++;
if (deb_check(release:"6.0", prefix:"ruby1.9.1-examples", reference:"1.9.2.0-2+deb6u6")) flag++;
if (deb_check(release:"6.0", prefix:"ruby1.9.1-full", reference:"1.9.2.0-2+deb6u6")) 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");