The remote NewStart CGSL host, running version CORE 5.04 / MAIN 5.04, has openssh packages installed that are affected by multiple vulnerabilities:
In OpenSSH 7.9, scp.c in the scp client allows remote SSH servers to bypass intended access restrictions via the filename of . or an empty filename. The impact is modifying the permissions of the target directory on the client side. (CVE-2018-20685)
An issue was discovered in OpenSSH 7.9. Due to missing character encoding in the progress display, a malicious server (or Man-in-The-Middle attacker) can employ crafted object names to manipulate the client output, e.g., by using ANSI control codes to hide additional files being transferred. This affects refresh_progress_meter() in progressmeter.c.
(CVE-2019-6109)
In OpenSSH 7.9, due to accepting and displaying arbitrary stderr output from the server, a malicious server (or Man-in-The-Middle attacker) can manipulate the client output, for example to use ANSI control codes to hide additional files being transferred.
(CVE-2019-6110)
An issue was discovered in OpenSSH 7.9. Due to the scp implementation being derived from 1983 rcp, the server chooses which files/directories are sent to the client.
However, the scp client only performs cursory validation of the object name returned (only directory traversal attacks are prevented). A malicious scp server (or Man- in-The-Middle attacker) can overwrite arbitrary files in the scp client target directory. If recursive operation (-r) is performed, the server can manipulate subdirectories as well (for example, to overwrite the .ssh/authorized_keys file). (CVE-2019-6111)
Note that Nessus has not tested for this issue but has instead relied only on the application’s self-reported version number.
#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from ZTE advisory NS-SA-2019-0060. The text
# itself is copyright (C) ZTE, Inc.
include('deprecated_nasl_level.inc');
include('compat.inc');
if (description)
{
script_id(127253);
script_version("1.5");
script_set_attribute(attribute:"plugin_modification_date", value:"2022/05/19");
script_cve_id(
"CVE-2018-20685",
"CVE-2019-6109",
"CVE-2019-6110",
"CVE-2019-6111"
);
script_bugtraq_id(106531);
script_name(english:"NewStart CGSL CORE 5.04 / MAIN 5.04 : openssh Multiple Vulnerabilities (NS-SA-2019-0060)");
script_set_attribute(attribute:"synopsis", value:
"The remote machine is affected by multiple vulnerabilities.");
script_set_attribute(attribute:"description", value:
"The remote NewStart CGSL host, running version CORE 5.04 / MAIN 5.04, has openssh packages installed that are affected
by multiple vulnerabilities:
- In OpenSSH 7.9, scp.c in the scp client allows remote
SSH servers to bypass intended access restrictions via
the filename of . or an empty filename. The impact is
modifying the permissions of the target directory on the
client side. (CVE-2018-20685)
- An issue was discovered in OpenSSH 7.9. Due to missing
character encoding in the progress display, a malicious
server (or Man-in-The-Middle attacker) can employ
crafted object names to manipulate the client output,
e.g., by using ANSI control codes to hide additional
files being transferred. This affects
refresh_progress_meter() in progressmeter.c.
(CVE-2019-6109)
- In OpenSSH 7.9, due to accepting and displaying
arbitrary stderr output from the server, a malicious
server (or Man-in-The-Middle attacker) can manipulate
the client output, for example to use ANSI control codes
to hide additional files being transferred.
(CVE-2019-6110)
- An issue was discovered in OpenSSH 7.9. Due to the scp
implementation being derived from 1983 rcp, the server
chooses which files/directories are sent to the client.
However, the scp client only performs cursory validation
of the object name returned (only directory traversal
attacks are prevented). A malicious scp server (or Man-
in-The-Middle attacker) can overwrite arbitrary files in
the scp client target directory. If recursive operation
(-r) is performed, the server can manipulate
subdirectories as well (for example, to overwrite the
.ssh/authorized_keys file). (CVE-2019-6111)
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:"http://security.gd-linux.com/notice/NS-SA-2019-0060");
script_set_attribute(attribute:"solution", value:
"Upgrade the vulnerable CGSL openssh packages. Note that updated packages may not be available yet. Please contact ZTE
for more information.");
script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:N/I:P/A:P");
script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N");
script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
script_set_attribute(attribute:"cvss_score_source", value:"CVE-2019-6111");
script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2019-6110");
script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
script_set_attribute(attribute:"exploit_available", value:"true");
script_set_attribute(attribute:"vuln_publication_date", value:"2019/01/10");
script_set_attribute(attribute:"patch_publication_date", value:"2019/07/17");
script_set_attribute(attribute:"plugin_publication_date", value:"2019/08/12");
script_set_attribute(attribute:"plugin_type", value:"local");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"NewStart CGSL Local Security Checks");
script_copyright(english:"This script is Copyright (C) 2019-2022 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_dependencies("ssh_get_info.nasl");
script_require_keys("Host/local_checks_enabled", "Host/ZTE-CGSL/release", "Host/ZTE-CGSL/rpm-list", "Host/cpu");
exit(0);
}
include("audit.inc");
include("global_settings.inc");
include("rpm.inc");
if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
release = get_kb_item("Host/ZTE-CGSL/release");
if (isnull(release) || release !~ "^CGSL (MAIN|CORE)") audit(AUDIT_OS_NOT, "NewStart Carrier Grade Server Linux");
if (release !~ "CGSL CORE 5.04" &&
release !~ "CGSL MAIN 5.04")
audit(AUDIT_OS_NOT, 'NewStart CGSL CORE 5.04 / NewStart CGSL MAIN 5.04');
if (!get_kb_item("Host/ZTE-CGSL/rpm-list")) 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, "NewStart Carrier Grade Server Linux", cpu);
flag = 0;
pkgs = {
"CGSL CORE 5.04": [
"openssh-7.9p1-1.el7.cgslv5.0.7.ga049176",
"openssh-askpass-7.9p1-1.el7.cgslv5.0.7.ga049176",
"openssh-cavs-7.9p1-1.el7.cgslv5.0.7.ga049176",
"openssh-clients-7.9p1-1.el7.cgslv5.0.7.ga049176",
"openssh-debuginfo-7.9p1-1.el7.cgslv5.0.7.ga049176",
"openssh-keycat-7.9p1-1.el7.cgslv5.0.7.ga049176",
"openssh-ldap-7.9p1-1.el7.cgslv5.0.7.ga049176",
"openssh-server-7.9p1-1.el7.cgslv5.0.7.ga049176",
"pam_ssh_agent_auth-0.10.3-6.1.el7.cgslv5.0.7.ga049176"
],
"CGSL MAIN 5.04": [
"openssh-7.9p1-1.el7.cgslv5.0.7.ga049176",
"openssh-askpass-7.9p1-1.el7.cgslv5.0.7.ga049176",
"openssh-cavs-7.9p1-1.el7.cgslv5.0.7.ga049176",
"openssh-clients-7.9p1-1.el7.cgslv5.0.7.ga049176",
"openssh-debuginfo-7.9p1-1.el7.cgslv5.0.7.ga049176",
"openssh-keycat-7.9p1-1.el7.cgslv5.0.7.ga049176",
"openssh-ldap-7.9p1-1.el7.cgslv5.0.7.ga049176",
"openssh-server-7.9p1-1.el7.cgslv5.0.7.ga049176",
"pam_ssh_agent_auth-0.10.3-6.1.el7.cgslv5.0.7.ga049176"
]
};
pkg_list = pkgs[release];
foreach (pkg in pkg_list)
if (rpm_check(release:"ZTE " + release, reference:pkg)) flag++;
if (flag)
{
security_report_v4(
port : 0,
severity : SECURITY_WARNING,
extra : rpm_report_get()
);
exit(0);
}
else
{
tested = pkg_tests_get();
if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
else audit(AUDIT_PACKAGE_NOT_INSTALLED, "openssh");
}