CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
AI Score
Confidence
High
EPSS
Percentile
73.8%
According to the versions of the tigervnc packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :
A heap buffer overflow flaw was found in the DisableDevice function in the X.Org server. This issue may lead to an application crash or, in some circumstances, remote code execution in SSH X11 forwarding environments.(CVE-2024-21886)
An out-of-bounds memory access flaw was found in the X.Org server. This issue can be triggered when a device frozen by a sync grab is reattached to a different master device. This issue may lead to an application crash, local privilege escalation (if the server runs with extended privileges), or remote code execution in SSH X11 forwarding environments.(CVE-2024-0229)
A flaw was found in X.Org server. In the XISendDeviceHierarchyEvent function, it is possible to exceed the allocated array length when certain new device IDs are added to the xXIHierarchyInfo struct. This can trigger a heap buffer overflow condition, which may lead to an application crash or remote code execution in SSH X11 forwarding environments.(CVE-2024-21885)
A flaw was found in the X.Org server. The GLX PBuffer code does not call the XACE hook when creating the buffer, leaving it unlabeled. When the client issues another request to access that resource (as with a GetGeometry) or when it creates another resource that needs to access that buffer, such as a GC, the XSELINUX code will try to use an object that was never labeled and crash because the SID is NULL.(CVE-2024-0408)
A flaw was found in X.Org server. Both DeviceFocusEvent and the XIQueryPointer reply contain a bit for each logical button currently down. Buttons can be arbitrarily mapped to any value up to 255, but the X.Org Server was only allocating space for the device's particular number of buttons, leading to a heap overflow if a bigger value was used.(CVE-2023-6816)
A flaw was found in the X.Org server. The cursor code in both Xephyr and Xwayland uses the wrong type of private at creation. It uses the cursor bits type with the cursor as private, and when initiating the cursor, that overwrites the XSELINUX context.(CVE-2024-0409)
Tenable has extracted the preceding description block directly from the EulerOS tigervnc security advisory.
Note that Nessus has not tested for these issues but has instead relied only on the application’s self-reported version number.
#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##
include('compat.inc');
if (description)
{
script_id(203697);
script_version("1.1");
script_set_attribute(attribute:"plugin_modification_date", value:"2024/07/23");
script_cve_id(
"CVE-2023-6816",
"CVE-2024-0229",
"CVE-2024-0408",
"CVE-2024-0409",
"CVE-2024-21885",
"CVE-2024-21886"
);
script_name(english:"EulerOS 2.0 SP8 : tigervnc (EulerOS-SA-2024-2062)");
script_set_attribute(attribute:"synopsis", value:
"The remote EulerOS host is missing multiple security updates.");
script_set_attribute(attribute:"description", value:
"According to the versions of the tigervnc packages installed, the EulerOS installation on the remote host is affected by
the following vulnerabilities :
A heap buffer overflow flaw was found in the DisableDevice function in the X.Org server. This issue may
lead to an application crash or, in some circumstances, remote code execution in SSH X11 forwarding
environments.(CVE-2024-21886)
An out-of-bounds memory access flaw was found in the X.Org server. This issue can be triggered when a
device frozen by a sync grab is reattached to a different master device. This issue may lead to an
application crash, local privilege escalation (if the server runs with extended privileges), or remote
code execution in SSH X11 forwarding environments.(CVE-2024-0229)
A flaw was found in X.Org server. In the XISendDeviceHierarchyEvent function, it is possible to exceed the
allocated array length when certain new device IDs are added to the xXIHierarchyInfo struct. This can
trigger a heap buffer overflow condition, which may lead to an application crash or remote code execution
in SSH X11 forwarding environments.(CVE-2024-21885)
A flaw was found in the X.Org server. The GLX PBuffer code does not call the XACE hook when creating the
buffer, leaving it unlabeled. When the client issues another request to access that resource (as with a
GetGeometry) or when it creates another resource that needs to access that buffer, such as a GC, the
XSELINUX code will try to use an object that was never labeled and crash because the SID is
NULL.(CVE-2024-0408)
A flaw was found in X.Org server. Both DeviceFocusEvent and the XIQueryPointer reply contain a bit for
each logical button currently down. Buttons can be arbitrarily mapped to any value up to 255, but the
X.Org Server was only allocating space for the device's particular number of buttons, leading to a heap
overflow if a bigger value was used.(CVE-2023-6816)
A flaw was found in the X.Org server. The cursor code in both Xephyr and Xwayland uses the wrong type of
private at creation. It uses the cursor bits type with the cursor as private, and when initiating the
cursor, that overwrites the XSELINUX context.(CVE-2024-0409)
Tenable has extracted the preceding description block directly from the EulerOS tigervnc security advisory.
Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
# https://developer.huaweicloud.com/ict/en/site-euleros/euleros/security-advisories/EulerOS-SA-2024-2062
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?37ed6961");
script_set_attribute(attribute:"solution", value:
"Update the affected tigervnc packages.");
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:U/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:U/RL:O/RC:C");
script_set_attribute(attribute:"cvss_score_source", value:"CVE-2023-6816");
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:"2024/01/16");
script_set_attribute(attribute:"patch_publication_date", value:"2024/07/23");
script_set_attribute(attribute:"plugin_publication_date", value:"2024/07/23");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:tigervnc");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:tigervnc-icons");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:tigervnc-license");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:tigervnc-server");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:tigervnc-server-minimal");
script_set_attribute(attribute:"cpe", value:"cpe:/o:huawei:euleros:2.0");
script_set_attribute(attribute:"generated_plugin", value:"current");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"Huawei Local Security Checks");
script_copyright(english:"This script is Copyright (C) 2024 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_dependencies("ssh_get_info.nasl");
script_require_keys("Host/local_checks_enabled", "Host/cpu", "Host/EulerOS/release", "Host/EulerOS/rpm-list", "Host/EulerOS/sp");
script_exclude_keys("Host/EulerOS/uvp_version");
exit(0);
}
include("rpm.inc");
if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var _release = get_kb_item("Host/EulerOS/release");
if (isnull(_release) || _release !~ "^EulerOS") audit(AUDIT_OS_NOT, "EulerOS");
var uvp = get_kb_item("Host/EulerOS/uvp_version");
if (_release !~ "^EulerOS release 2\.0(\D|$)") audit(AUDIT_OS_NOT, "EulerOS 2.0 SP8");
var sp = get_kb_item("Host/EulerOS/sp");
if (isnull(sp) || sp !~ "^(8)$") audit(AUDIT_OS_NOT, "EulerOS 2.0 SP8");
if (!empty_or_null(uvp)) audit(AUDIT_OS_NOT, "EulerOS 2.0 SP8", "EulerOS UVP " + uvp);
if (!get_kb_item("Host/EulerOS/rpm-list")) 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$" && "aarch64" >!< cpu && "x86" >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "EulerOS", cpu);
if ("aarch64" >!< cpu) audit(AUDIT_ARCH_NOT, "aarch64", cpu);
var flag = 0;
var pkgs = [
"tigervnc-1.9.0-3.h10.eulerosv2r8",
"tigervnc-icons-1.9.0-3.h10.eulerosv2r8",
"tigervnc-license-1.9.0-3.h10.eulerosv2r8",
"tigervnc-server-1.9.0-3.h10.eulerosv2r8",
"tigervnc-server-minimal-1.9.0-3.h10.eulerosv2r8"
];
foreach (var pkg in pkgs)
if (rpm_check(release:"EulerOS-2.0", sp:"8", reference:pkg)) flag++;
if (flag)
{
security_report_v4(
port : 0,
severity : SECURITY_HOLE,
extra : rpm_report_get()
);
exit(0);
}
else
{
var tested = pkg_tests_get();
if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
else audit(AUDIT_PACKAGE_NOT_INSTALLED, "tigervnc");
}
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-6816
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-0229
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-0408
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-0409
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-21885
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-21886
www.nessus.org/u?37ed6961
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
AI Score
Confidence
High
EPSS
Percentile
73.8%