Debian DLA-986-1 : zookeeper security update

2017-06-16T00:00:00
ID DEBIAN_DLA-986.NASL
Type nessus
Reporter Tenable
Modified 2018-07-10T00:00:00

Description

It was discovered that Zookeeper, a service for maintaining configuration information, didn't restrict access to the computationally expensive wchp/wchc commands which could result in denial of service by elevated CPU consumption.

This update disables those two commands by default. The new configuration option '4lw.commands.whitelist' can be used to whitelist commands selectively (and the full set of commands can be restored with '*')

For Debian 7 'Wheezy', these problems have been fixed in version 3.4.5+dfsg-2+deb7u1.

We recommend that you upgrade your zookeeper packages.

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.

                                        
                                            #
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Debian Security Advisory DLA-986-1. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include("compat.inc");

if (description)
{
  script_id(100816);
  script_version("3.6");
  script_cvs_date("Date: 2018/07/10 12:45:04");

  script_cve_id("CVE-2017-5637");

  script_name(english:"Debian DLA-986-1 : zookeeper 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 Zookeeper, a service for maintaining
configuration information, didn't restrict access to the
computationally expensive wchp/wchc commands which could result in
denial of service by elevated CPU consumption.

This update disables those two commands by default. The new
configuration option '4lw.commands.whitelist' can be used to whitelist
commands selectively (and the full set of commands can be restored
with '*')

For Debian 7 'Wheezy', these problems have been fixed in version
3.4.5+dfsg-2+deb7u1.

We recommend that you upgrade your zookeeper packages.

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/2017/06/msg00015.html"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://packages.debian.org/source/wheezy/zookeeper"
  );
  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: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:N/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libzookeeper-java");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libzookeeper-java-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libzookeeper-mt-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libzookeeper-mt2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libzookeeper-st-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libzookeeper-st2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libzookeeper2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:python-zookeeper");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:zookeeper");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:zookeeper-bin");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:zookeeperd");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:7.0");

  script_set_attribute(attribute:"patch_publication_date", value:"2017/06/15");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/06/16");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2017-2018 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:"7.0", prefix:"libzookeeper-java", reference:"3.4.5+dfsg-2+deb7u1")) flag++;
if (deb_check(release:"7.0", prefix:"libzookeeper-java-doc", reference:"3.4.5+dfsg-2+deb7u1")) flag++;
if (deb_check(release:"7.0", prefix:"libzookeeper-mt-dev", reference:"3.4.5+dfsg-2+deb7u1")) flag++;
if (deb_check(release:"7.0", prefix:"libzookeeper-mt2", reference:"3.4.5+dfsg-2+deb7u1")) flag++;
if (deb_check(release:"7.0", prefix:"libzookeeper-st-dev", reference:"3.4.5+dfsg-2+deb7u1")) flag++;
if (deb_check(release:"7.0", prefix:"libzookeeper-st2", reference:"3.4.5+dfsg-2+deb7u1")) flag++;
if (deb_check(release:"7.0", prefix:"libzookeeper2", reference:"3.4.5+dfsg-2+deb7u1")) flag++;
if (deb_check(release:"7.0", prefix:"python-zookeeper", reference:"3.4.5+dfsg-2+deb7u1")) flag++;
if (deb_check(release:"7.0", prefix:"zookeeper", reference:"3.4.5+dfsg-2+deb7u1")) flag++;
if (deb_check(release:"7.0", prefix:"zookeeper-bin", reference:"3.4.5+dfsg-2+deb7u1")) flag++;
if (deb_check(release:"7.0", prefix:"zookeeperd", reference:"3.4.5+dfsg-2+deb7u1")) 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");