CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:N/I:N/A:C
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
AI Score
Confidence
High
EPSS
Percentile
99.9%
The remote host is running a version of RancherOS prior to v1.5.3, hence is exposed to multiple vulnerabilities:
Linux Kernel is prone to a remote integer-overflow vulnerability.
An attacker can exploit this issue to cause denial-of-service conditions. (CVE-2019-11477)
RancherOS is vulnerable to a denial of service; by crafting a sequence of SACKs, an attacker can cause fragmentation of the TCP transmission queue, leading to higher resource use. (CVE-2019-11478)
Linux kernel default MSS is hard-coded to 48 bytes. This allows a remote peer to fragment TCP resend queues significantly more than if a larger MSS were enforced. A remote attacker could use this to cause a denial of service. (CVE-2019-11479)
#
# (C) Tenable Network Security, Inc.
#
# @NOAGENT@
include('compat.inc');
if (description)
{
script_id(132257);
script_version("1.6");
script_set_attribute(attribute:"plugin_modification_date", value:"2024/04/03");
script_cve_id("CVE-2019-11477", "CVE-2019-11478", "CVE-2019-11479");
script_bugtraq_id(108798, 108801, 108818);
script_xref(name:"CEA-ID", value:"CEA-2019-0456");
script_name(english:"RancherOS < 1.5.3 Multiple Vulnerabilities (SACK Panic)");
script_set_attribute(attribute:"synopsis", value:
"The remote device is missing a vendor-supplied security patch");
script_set_attribute(attribute:"description", value:
"The remote host is running a version of RancherOS prior to v1.5.3, hence
is exposed to multiple vulnerabilities:
- Linux Kernel is prone to a remote integer-overflow vulnerability.
An attacker can exploit this issue to cause denial-of-service
conditions. (CVE-2019-11477)
- RancherOS is vulnerable to a denial of service; by crafting a
sequence of SACKs, an attacker can cause fragmentation of the
TCP transmission queue, leading to higher resource use.
(CVE-2019-11478)
- Linux kernel default MSS is hard-coded to 48 bytes. This allows
a remote peer to fragment TCP resend queues significantly more
than if a larger MSS were enforced. A remote attacker could use
this to cause a denial of service. (CVE-2019-11479)");
script_set_attribute(attribute:"see_also", value:"https://rancher.com/docs/os/v1.x/en/about/security/");
script_set_attribute(attribute:"see_also", value:"https://github.com/rancher/os/releases/tag/v1.5.3");
script_set_attribute(attribute:"see_also", value:"https://lwn.net/Articles/791409/");
script_set_attribute(attribute:"solution", value:
"Upgrade to RancherOS v1.5.3 or later");
script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C");
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:"cvss_score_source", value:"CVE-2019-11477");
script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2019-11479");
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:"2019/06/18");
script_set_attribute(attribute:"patch_publication_date", value:"2019/07/11");
script_set_attribute(attribute:"plugin_publication_date", value:"2019/12/19");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"cpe:/o:rancher:rancheros");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"Misc.");
script_copyright(english:"This script is Copyright (C) 2019-2024 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_dependencies("ssh_get_info.nasl", "os_fingerprint_linux_distro.nasl");
script_require_keys("Host/local_checks_enabled", "Host/RancherOS/version", "Host/RancherOS");
exit(0);
}
include('audit.inc');
include('global_settings.inc');
include('misc_func.inc');
if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
# Fix version is v1.5.3
fix_version = '1.5.3';
os = get_kb_item('Host/RancherOS');
if (!os) audit(AUDIT_OS_NOT, 'RancherOS');
os_ver = get_kb_item('Host/RancherOS/version');
if (!os_ver)
{
exit(1, 'Could not determine the RancherOS version');
}
match = pregmatch(pattern:"v([0-9\.]+)", string:os_ver);
if (!isnull(match))
{
version = match[1];
if (ver_compare(ver:version, fix:fix_version, strict:TRUE) == -1)
{
security_report_v4(
port:0,
severity:SECURITY_HOLE,
extra:
'\n Installed version : ' + os_ver +
'\n Fixed version : v' + fix_version +
'\n'
);
}
}
audit(AUDIT_INST_VER_NOT_VULN, 'RancherOS', os_ver);
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:N/I:N/A:C
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
AI Score
Confidence
High
EPSS
Percentile
99.9%