Vulnerabilities > CVE-2019-7304 - Incorrect Authorization vulnerability in Canonical Snapd

047910
CVSS 9.8 - CRITICAL
Attack vector
NETWORK
Attack complexity
LOW
Privileges required
NONE
Confidentiality impact
HIGH
Integrity impact
HIGH
Availability impact
HIGH
network
low complexity
canonical
CWE-863
critical
nessus
exploit available

Summary

Canonical snapd before version 2.37.1 incorrectly performed socket owner validation, allowing an attacker to run arbitrary commands as root. This issue affects: Canonical snapd versions prior to 2.37.1.

Vulnerable Configurations

Part Description Count
Application
Canonical
174
OS
Canonical
4

Common Weakness Enumeration (CWE)

Exploit-Db

  • idEDB-ID:46360
    last seen2019-02-12
    modified2019-02-12
    published2019-02-12
    reporterExploit-DB
    sourcehttps://www.exploit-db.com/download/46360
    titleUbuntu snapd < 2.37.1 - Local Privilege Escalation
  • idEDB-ID:46362
    last seen2019-02-13
    modified2019-02-13
    published2019-02-13
    reporterExploit-DB
    sourcehttps://www.exploit-db.com/download/46362
    titlesnapd < 2.37.0 (Ubuntu) - 'dirty_sock' Local Privilege Escalation (2)
  • idEDB-ID:46361
    last seen2019-02-13
    modified2019-02-13
    published2019-02-13
    reporterExploit-DB
    sourcehttps://www.exploit-db.com/download/46361
    titlesnapd < 2.37.0 (Ubuntu) - 'dirty_sock' Local Privilege Escalation (1)

Nessus

NASL familyUbuntu Local Security Checks
NASL idUBUNTU_USN-3887-1.NASL
descriptionChris Moberly discovered that snapd versions 2.28 through 2.37 incorrectly validated and parsed the remote socket address when performing access controls on its UNIX socket. A local attacker could use this to access privileged socket APIs and obtain administrator privileges. On Ubuntu systems with snaps installed, snapd typically will have already automatically refreshed itself to snapd 2.37.1 which is unaffected. Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
last seen2020-06-01
modified2020-06-02
plugin id122152
published2019-02-13
reporterUbuntu Security Notice (C) 2019 Canonical, Inc. / NASL script (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof.
sourcehttps://www.tenable.com/plugins/nessus/122152
titleUbuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 18.10 : snapd vulnerability (USN-3887-1)
code
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-3887-1. The text 
# itself is copyright (C) Canonical, Inc. See 
# <http://www.ubuntu.com/usn/>. Ubuntu(R) is a registered 
# trademark of Canonical, Inc.
#

include("compat.inc");

if (description)
{
  script_id(122152);
  script_version("1.6");
  script_cvs_date("Date: 2019/09/18 12:31:49");

  script_cve_id("CVE-2019-7304");
  script_xref(name:"USN", value:"3887-1");

  script_name(english:"Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 18.10 : snapd vulnerability (USN-3887-1)");
  script_summary(english:"Checks dpkg output for updated package.");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote Ubuntu host is missing a security-related patch."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"Chris Moberly discovered that snapd versions 2.28 through 2.37
incorrectly validated and parsed the remote socket address when
performing access controls on its UNIX socket. A local attacker could
use this to access privileged socket APIs and obtain administrator
privileges. On Ubuntu systems with snaps installed, snapd typically
will have already automatically refreshed itself to snapd 2.37.1 which
is unaffected.

Note that Tenable Network Security has extracted the preceding
description block directly from the Ubuntu 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://usn.ubuntu.com/3887-1/"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected snapd package.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:F/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:F/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:"exploit_framework_core", value:"true");
  script_set_attribute(attribute:"exploit_framework_canvas", value:"true");
  script_set_attribute(attribute:"canvas_package", value:'CANVAS');

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:snapd");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:14.04");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:16.04");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:18.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:18.10");

  script_set_attribute(attribute:"vuln_publication_date", value:"2019/04/23");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/02/12");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/02/13");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"Ubuntu Security Notice (C) 2019 Canonical, Inc. / NASL script (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"Ubuntu Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/cpu", "Host/Ubuntu", "Host/Ubuntu/release", "Host/Debian/dpkg-l");

  exit(0);
}


include("audit.inc");
include("ubuntu.inc");
include("misc_func.inc");

if ( ! get_kb_item("Host/local_checks_enabled") ) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
release = get_kb_item("Host/Ubuntu/release");
if ( isnull(release) ) audit(AUDIT_OS_NOT, "Ubuntu");
release = chomp(release);
if (! preg(pattern:"^(14\.04|16\.04|18\.04|18\.10)$", string:release)) audit(AUDIT_OS_NOT, "Ubuntu 14.04 / 16.04 / 18.04 / 18.10", "Ubuntu " + release);
if ( ! get_kb_item("Host/Debian/dpkg-l") ) audit(AUDIT_PACKAGE_LIST_MISSING);

cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Ubuntu", cpu);

flag = 0;

if (ubuntu_check(osver:"14.04", pkgname:"snapd", pkgver:"2.34.2~14.04.1")) flag++;
if (ubuntu_check(osver:"16.04", pkgname:"snapd", pkgver:"2.34.2ubuntu0.1")) flag++;
if (ubuntu_check(osver:"18.04", pkgname:"snapd", pkgver:"2.34.2+18.04.1")) flag++;
if (ubuntu_check(osver:"18.10", pkgname:"snapd", pkgver:"2.35.5+18.10.1")) flag++;

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : ubuntu_report_get()
  );
  exit(0);
}
else
{
  tested = ubuntu_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "snapd");
}

Packetstorm

The Hacker News

idTHN:0AFF942FE27757416BFE1544C73F5CA5
last seen2019-02-13
modified2019-02-13
published2019-02-13
reporterThe Hacker News
sourcehttps://thehackernews.com/2019/02/snapd-linux-privilege-escalation.html
titleSnapd Flaw Lets Attackers Gain Root Access On Linux Systems