CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:P/I:P/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
AI Score
Confidence
High
EPSS
Percentile
73.4%
The remote Ubuntu 16.04 LTS / 18.04 LTS host has packages installed that are affected by a vulnerability as referenced in the USN-4436-2 advisory.
USN-4436-1 fixed a vulnerability in librsvg. The upstream fix caused a regression when parsing certain SVG files. This update backs out the fix pending further investigation.
Original advisory details:
It was discovered that librsvg incorrectly handled parsing certain SVG
files. A remote attacker could possibly use this issue to cause librsvg to
crash, resulting in a denial of service. This issue only affected Ubuntu
16.04 LTS. (CVE-2017-11464)
It was discovered that librsvg incorrectly handled parsing certain SVG
files with nested patterns. A remote attacker could possibly use this issue
to cause librsvg to consume resources and crash, resulting in a denial of
service. (CVE-2019-20446)
Tenable has extracted the preceding description block directly from the Ubuntu security advisory.
Note that Nessus has not tested for this issue but has instead relied only on the application’s self-reported version number.
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-4436-2. 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(139180);
script_version("1.8");
script_set_attribute(attribute:"plugin_modification_date", value:"2024/08/29");
script_xref(name:"USN", value:"4436-2");
script_name(english:"Ubuntu 16.04 LTS / 18.04 LTS : librsvg regression (USN-4436-2)");
script_set_attribute(attribute:"synopsis", value:
"The remote Ubuntu host is missing a security update.");
script_set_attribute(attribute:"description", value:
"The remote Ubuntu 16.04 LTS / 18.04 LTS host has packages installed that are affected by a vulnerability as referenced
in the USN-4436-2 advisory.
USN-4436-1 fixed a vulnerability in librsvg. The upstream fix caused a regression when parsing certain SVG
files. This update backs out the fix pending further investigation.
Original advisory details:
It was discovered that librsvg incorrectly handled parsing certain SVG
files. A remote attacker could possibly use this issue to cause librsvg to
crash, resulting in a denial of service. This issue only affected Ubuntu
16.04 LTS. (CVE-2017-11464)
It was discovered that librsvg incorrectly handled parsing certain SVG
files with nested patterns. A remote attacker could possibly use this issue
to cause librsvg to consume resources and crash, resulting in a denial of
service. (CVE-2019-20446)
Tenable has extracted the preceding description block directly from the Ubuntu security advisory.
Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/notices/USN-4436-2");
script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
script_set_attribute(attribute:"risk_factor", value:"Medium");
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:"2017/07/19");
script_set_attribute(attribute:"patch_publication_date", value:"2020/07/29");
script_set_attribute(attribute:"plugin_publication_date", value:"2020/07/30");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:librsvg2-2");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:librsvg2-bin");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:librsvg2-common");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:librsvg2-dev");
script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:16.04:-:lts");
script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:18.04:-:lts");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:gir1.2-rsvg-2.0");
script_set_attribute(attribute:"generated_plugin", value:"current");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"Ubuntu Local Security Checks");
script_copyright(english:"Ubuntu Security Notice (C) 2020-2024 Canonical, Inc. / NASL script (C) 2020-2024 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_dependencies("ssh_get_info.nasl");
script_require_keys("Host/cpu", "Host/Ubuntu", "Host/Ubuntu/release", "Host/Debian/dpkg-l");
exit(0);
}
include('debian_package.inc');
if ( ! get_kb_item('Host/local_checks_enabled') ) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_release = get_kb_item('Host/Ubuntu/release');
if ( isnull(os_release) ) audit(AUDIT_OS_NOT, 'Ubuntu');
os_release = chomp(os_release);
if (! ('16.04' >< os_release || '18.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 16.04 / 18.04', 'Ubuntu ' + os_release);
if ( ! get_kb_item('Host/Debian/dpkg-l') ) audit(AUDIT_PACKAGE_LIST_MISSING);
var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 's390' >!< cpu && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Ubuntu', cpu);
var pkgs = [
{'osver': '16.04', 'pkgname': 'gir1.2-rsvg-2.0', 'pkgver': '2.40.13-3ubuntu0.2'},
{'osver': '16.04', 'pkgname': 'librsvg2-2', 'pkgver': '2.40.13-3ubuntu0.2'},
{'osver': '16.04', 'pkgname': 'librsvg2-bin', 'pkgver': '2.40.13-3ubuntu0.2'},
{'osver': '16.04', 'pkgname': 'librsvg2-common', 'pkgver': '2.40.13-3ubuntu0.2'},
{'osver': '16.04', 'pkgname': 'librsvg2-dev', 'pkgver': '2.40.13-3ubuntu0.2'},
{'osver': '18.04', 'pkgname': 'gir1.2-rsvg-2.0', 'pkgver': '2.40.20-2ubuntu0.2'},
{'osver': '18.04', 'pkgname': 'librsvg2-2', 'pkgver': '2.40.20-2ubuntu0.2'},
{'osver': '18.04', 'pkgname': 'librsvg2-bin', 'pkgver': '2.40.20-2ubuntu0.2'},
{'osver': '18.04', 'pkgname': 'librsvg2-common', 'pkgver': '2.40.20-2ubuntu0.2'},
{'osver': '18.04', 'pkgname': 'librsvg2-dev', 'pkgver': '2.40.20-2ubuntu0.2'}
];
var flag = 0;
foreach var package_array ( pkgs ) {
var osver = NULL;
var pkgname = NULL;
var pkgver = NULL;
if (!empty_or_null(package_array['osver'])) osver = package_array['osver'];
if (!empty_or_null(package_array['pkgname'])) pkgname = package_array['pkgname'];
if (!empty_or_null(package_array['pkgver'])) pkgver = package_array['pkgver'];
if (osver && pkgname && pkgver) {
if (ubuntu_check(osver:osver, pkgname:pkgname, pkgver:pkgver)) flag++;
}
}
if (flag)
{
var extra = '';
extra += ubuntu_report_get();
security_report_v4(
port : 0,
severity : SECURITY_WARNING,
extra : extra
);
exit(0);
}
else
{
var tested = ubuntu_pkg_tests_get();
if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'gir1.2-rsvg-2.0 / librsvg2-2 / librsvg2-bin / librsvg2-common / etc');
}
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:P/I:P/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
AI Score
Confidence
High
EPSS
Percentile
73.4%