8.1 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
8.4 High
AI Score
Confidence
High
0.049 Low
EPSS
Percentile
92.8%
QNAP QuTS hero is prone to a remote code execution (RCE)
vulnerability in OpenSSH dubbed
# SPDX-FileCopyrightText: 2024 Greenbone AG
# Some text descriptions might be excerpted from (a) referenced
# source(s), and are Copyright (C) by the respective right holder(s).
#
# SPDX-License-Identifier: GPL-2.0-only
CPE = "cpe:/o:qnap:quts_hero";
if(description)
{
script_oid("1.3.6.1.4.1.25623.1.0.114688");
script_version("2024-07-04T05:05:37+0000");
script_tag(name:"last_modification", value:"2024-07-04 05:05:37 +0000 (Thu, 04 Jul 2024)");
script_tag(name:"creation_date", value:"2024-07-03 13:05:47 +0000 (Wed, 03 Jul 2024)");
script_tag(name:"cvss_base", value:"10.0");
script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:C/I:C/A:C");
script_cve_id("CVE-2024-6387");
# nb: Only a release candidate of h5.2.0 affected
script_tag(name:"qod_type", value:"remote_banner_unreliable");
script_tag(name:"solution_type", value:"VendorFix");
script_name("QNAP QuTS hero OpenSSH RCE Vulnerability (QSA-24-31, regreSSHion)");
script_category(ACT_GATHER_INFO);
script_copyright("Copyright (C) 2024 Greenbone AG");
script_family("General");
script_dependencies("gb_qnap_nas_http_detect.nasl");
script_mandatory_keys("qnap/nas/quts_hero/detected");
script_tag(name:"summary", value:"QNAP QuTS hero is prone to a remote code execution (RCE)
vulnerability in OpenSSH dubbed 'regreSSHion'.");
script_tag(name:"vuldetect", value:"Checks if a vulnerable version is present on the target host.");
script_tag(name:"insight", value:"OpenSSH vendor insights:
1) Race condition in sshd(8)
A critical vulnerability in sshd(8) was present that may allow arbitrary code execution with root
privileges.
Successful exploitation has been demonstrated on 32-bit Linux/glibc systems with ASLR. Under lab
conditions, the attack requires on average 6-8 hours of continuous connections up to the maximum
the server will accept. Exploitation on 64-bit systems is believed to be possible but has not been
demonstrated at this time. It's likely that these attacks will be improved upon.
Exploitation on non-glibc systems is conceivable but has not been examined. Systems that lack ASLR
or users of downstream Linux distributions that have modified OpenSSH to disable per-connection
ASLR re-randomisation (yes - this is a thing, no - we don't understand why) may potentially have
an easier path to exploitation.");
script_tag(name:"affected", value:"QNAP QuTS hero version h5.2.0 Release Candidate (RC).");
script_tag(name:"solution", value:"Update to the final version h5.2.0 or later.");
script_xref(name:"URL", value:"https://www.qnap.com/en/security-advisory/qsa-24-31");
script_xref(name:"URL", value:"https://www.openssh.com/txt/release-9.8");
script_xref(name:"URL", value:"https://www.openssh.com/security.html");
script_xref(name:"URL", value:"https://www.qualys.com/2024/07/01/cve-2024-6387/regresshion.txt");
script_xref(name:"URL", value:"https://www.qualys.com/regresshion-cve-2024-6387/");
script_xref(name:"URL", value:"https://blog.qualys.com/vulnerabilities-threat-research/2024/07/01/regresshion-remote-unauthenticated-code-execution-vulnerability-in-openssh-server");
script_xref(name:"URL", value:"https://unit42.paloaltonetworks.com/threat-brief-cve-2024-6387-openssh/");
exit(0);
}
include("host_details.inc");
include("version_func.inc");
if (!version = get_app_version(cpe: CPE, nofork: TRUE))
exit(0);
if (version =~ "^h5\.2\.0") {
report = report_fixed_ver(installed_version: version, fixed_version: "h5.2.0 (Final version)");
security_message(port: 0, data: report);
exit(0);
}
exit(99);
blog.qualys.com/vulnerabilities-threat-research/2024/07/01/regresshion-remote-unauthenticated-code-execution-vulnerability-in-openssh-server
unit42.paloaltonetworks.com/threat-brief-cve-2024-6387-openssh/
www.openssh.com/security.html
www.openssh.com/txt/release-9.8
www.qnap.com/en/security-advisory/qsa-24-31
www.qualys.com/2024/07/01/cve-2024-6387/regresshion.txt
www.qualys.com/regresshion-cve-2024-6387/
8.1 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
8.4 High
AI Score
Confidence
High
0.049 Low
EPSS
Percentile
92.8%