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nessusThis script is Copyright (C) 2017-2021 and is owned by Tenable, Inc. or an Affiliate thereof.DEBIAN_DLA-767.NASL
HistoryJan 03, 2017 - 12:00 a.m.

Debian DLA-767-1 : curl security update

2017-01-0300:00:00
This script is Copyright (C) 2017-2021 and is owned by Tenable, Inc. or an Affiliate thereof.
www.tenable.com
22

It was discovered that libcurlโ€™s implementation of the printf() functions triggers a buffer overflow when doing a large floating point output. The bug occurs when the conversion outputs more than 255 bytes.

The flaw happens because the floating point conversion is using system functions without the correct boundary checks.

If there are any application that accepts a format string from the outside without necessary input filtering, it could allow remote attacks.

This flaw does not exist in the command line tool.

For Debian 7 โ€˜Wheezyโ€™, these problems have been fixed in version 7.26.0-1+wheezy18.

We recommend that you upgrade your curl 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.

#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Debian Security Advisory DLA-767-1. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(96183);
  script_version("3.6");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/11");

  script_cve_id("CVE-2016-9586");

  script_name(english:"Debian DLA-767-1 : curl 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 libcurl's implementation of the printf()
functions triggers a buffer overflow when doing a large floating point
output. The bug occurs when the conversion outputs more than 255
bytes.

The flaw happens because the floating point conversion is using system
functions without the correct boundary checks.

If there are any application that accepts a format string from the
outside without necessary input filtering, it could allow remote
attacks.

This flaw does not exist in the command line tool.

For Debian 7 'Wheezy', these problems have been fixed in version
7.26.0-1+wheezy18.

We recommend that you upgrade your curl 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/2016/12/msg00044.html"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://packages.debian.org/source/wheezy/curl"
  );
  script_set_attribute(attribute:"solution", value:"Upgrade the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/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:H/PR:N/UI:N/S:U/C:H/I:H/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:curl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libcurl3");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libcurl3-dbg");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libcurl3-gnutls");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libcurl3-nss");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libcurl4-gnutls-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libcurl4-nss-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libcurl4-openssl-dev");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:7.0");

  script_set_attribute(attribute:"patch_publication_date", value:"2016/12/29");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/01/03");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2017-2021 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:"7.0", prefix:"curl", reference:"7.26.0-1+wheezy18")) flag++;
if (deb_check(release:"7.0", prefix:"libcurl3", reference:"7.26.0-1+wheezy18")) flag++;
if (deb_check(release:"7.0", prefix:"libcurl3-dbg", reference:"7.26.0-1+wheezy18")) flag++;
if (deb_check(release:"7.0", prefix:"libcurl3-gnutls", reference:"7.26.0-1+wheezy18")) flag++;
if (deb_check(release:"7.0", prefix:"libcurl3-nss", reference:"7.26.0-1+wheezy18")) flag++;
if (deb_check(release:"7.0", prefix:"libcurl4-gnutls-dev", reference:"7.26.0-1+wheezy18")) flag++;
if (deb_check(release:"7.0", prefix:"libcurl4-nss-dev", reference:"7.26.0-1+wheezy18")) flag++;
if (deb_check(release:"7.0", prefix:"libcurl4-openssl-dev", reference:"7.26.0-1+wheezy18")) 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");