6.9 Medium
CVSS2
Attack Vector
LOCAL
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:L/AC:M/Au:N/C:C/I:C/A:C
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
7.6 High
AI Score
Confidence
Low
0.001 Low
EPSS
Percentile
26.5%
According to the versions of the grub2 packages installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities :
A crafted 16-bit grayscale PNG image may lead to a out-of-bounds write in the heap area. An attacker may take advantage of that to cause heap data corruption or eventually arbitrary code execution and circumvent secure boot protections. This issue has a high complexity to be exploited as an attacker needs to perform some triage over the heap layout to achieve signifcant results, also the values written into the memory are repeated three times in a row making difficult to produce valid payloads. This flaw affects grub2 versions prior grub-2.12. (CVE-2021-3695)
A heap out-of-bounds write may heppen during the handling of Huffman tables in the PNG reader. This may lead to data corruption in the heap space. Confidentiality, Integrity and Availablity impact may be considered Low as it’s very complex to an attacker control the encoding and positioning of corrupted Huffman entries to achieve results such as arbitrary code execution and/or secure boot circumvention. This flaw affects grub2 versions prior grub-2.12. (CVE-2021-3696)
A crafted JPEG image may lead the JPEG reader to underflow its data pointer, allowing user-controlled data to be written in heap. To a successful to be performed the attacker needs to perform some triage over the heap layout and craft an image with a malicious format and payload. This vulnerability can lead to data corruption and eventual code execution or secure boot circumvention. This flaw affects grub2 versions prior grub-2.12. (CVE-2021-3697)
A flaw in grub2 was found where its configuration file, known as grub.cfg, is being created with the wrong permission set allowing non privileged users to read its content. This represents a low severity confidentiality issue, as those users can eventually read any encrypted passwords present in grub.cfg.
This flaw affects grub2 2.06 and previous versions. This issue has been fixed in grub upstream but no version with the fix is currently released. (CVE-2021-3981)
grub2: Integer underflow in grub_net_recv_ip4_packets (CVE-2022-28733)
grub2: Out-of-bound write when handling split HTTP headers (CVE-2022-28734)
grub2: use-after-free in grub_cmd_chainloader() (CVE-2022-28736)
Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##
include('compat.inc');
if (description)
{
script_id(165383);
script_version("1.5");
script_set_attribute(attribute:"plugin_modification_date", value:"2024/01/18");
script_cve_id(
"CVE-2021-3695",
"CVE-2021-3696",
"CVE-2021-3697",
"CVE-2021-3981",
"CVE-2022-28733",
"CVE-2022-28734",
"CVE-2022-28736"
);
script_name(english:"EulerOS Virtualization 2.9.1 : grub2 (EulerOS-SA-2022-2345)");
script_set_attribute(attribute:"synopsis", value:
"The remote EulerOS Virtualization host is missing multiple security updates.");
script_set_attribute(attribute:"description", value:
"According to the versions of the grub2 packages installed, the EulerOS Virtualization installation on the remote host is
affected by the following vulnerabilities :
- A crafted 16-bit grayscale PNG image may lead to a out-of-bounds write in the heap area. An attacker may
take advantage of that to cause heap data corruption or eventually arbitrary code execution and circumvent
secure boot protections. This issue has a high complexity to be exploited as an attacker needs to perform
some triage over the heap layout to achieve signifcant results, also the values written into the memory
are repeated three times in a row making difficult to produce valid payloads. This flaw affects grub2
versions prior grub-2.12. (CVE-2021-3695)
- A heap out-of-bounds write may heppen during the handling of Huffman tables in the PNG reader. This may
lead to data corruption in the heap space. Confidentiality, Integrity and Availablity impact may be
considered Low as it's very complex to an attacker control the encoding and positioning of corrupted
Huffman entries to achieve results such as arbitrary code execution and/or secure boot circumvention. This
flaw affects grub2 versions prior grub-2.12. (CVE-2021-3696)
- A crafted JPEG image may lead the JPEG reader to underflow its data pointer, allowing user-controlled data
to be written in heap. To a successful to be performed the attacker needs to perform some triage over the
heap layout and craft an image with a malicious format and payload. This vulnerability can lead to data
corruption and eventual code execution or secure boot circumvention. This flaw affects grub2 versions
prior grub-2.12. (CVE-2021-3697)
- A flaw in grub2 was found where its configuration file, known as grub.cfg, is being created with the wrong
permission set allowing non privileged users to read its content. This represents a low severity
confidentiality issue, as those users can eventually read any encrypted passwords present in grub.cfg.
This flaw affects grub2 2.06 and previous versions. This issue has been fixed in grub upstream but no
version with the fix is currently released. (CVE-2021-3981)
- grub2: Integer underflow in grub_net_recv_ip4_packets (CVE-2022-28733)
- grub2: Out-of-bound write when handling split HTTP headers (CVE-2022-28734)
- grub2: use-after-free in grub_cmd_chainloader() (CVE-2022-28736)
Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security
advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional
issues.");
# https://developer.huaweicloud.com/ict/en/site-euleros/euleros/security-advisories/EulerOS-SA-2022-2345
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?b3e39507");
script_set_attribute(attribute:"solution", value:
"Update the affected grub2 packages.");
script_set_cvss_base_vector("CVSS2#AV:L/AC:M/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:H/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-2021-3696");
script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2022-28733");
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:"2022/03/10");
script_set_attribute(attribute:"patch_publication_date", value:"2022/09/23");
script_set_attribute(attribute:"plugin_publication_date", value:"2022/09/23");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:grub2-common");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:grub2-efi-aa64");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:grub2-efi-aa64-modules");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:grub2-tools");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:grub2-tools-extra");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:grub2-tools-minimal");
script_set_attribute(attribute:"cpe", value:"cpe:/o:huawei:euleros:uvp:2.9.1");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"Huawei Local Security Checks");
script_copyright(english:"This script is Copyright (C) 2022-2024 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/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 (uvp != "2.9.1") audit(AUDIT_OS_NOT, "EulerOS Virtualization 2.9.1");
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) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "EulerOS", cpu);
var flag = 0;
var pkgs = [
"grub2-common-2.02-73.h39.eulerosv2r9",
"grub2-efi-aa64-2.02-73.h39.eulerosv2r9",
"grub2-efi-aa64-modules-2.02-73.h39.eulerosv2r9",
"grub2-tools-2.02-73.h39.eulerosv2r9",
"grub2-tools-extra-2.02-73.h39.eulerosv2r9",
"grub2-tools-minimal-2.02-73.h39.eulerosv2r9"
];
foreach (var pkg in pkgs)
if (rpm_check(release:"EulerOS-2.0", reference:pkg)) flag++;
if (flag)
{
security_report_v4(
port : 0,
severity : SECURITY_WARNING,
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, "grub2");
}
Vendor | Product | Version | CPE |
---|---|---|---|
huawei | euleros | grub2-common | p-cpe:/a:huawei:euleros:grub2-common |
huawei | euleros | grub2-efi-aa64 | p-cpe:/a:huawei:euleros:grub2-efi-aa64 |
huawei | euleros | grub2-efi-aa64-modules | p-cpe:/a:huawei:euleros:grub2-efi-aa64-modules |
huawei | euleros | grub2-tools | p-cpe:/a:huawei:euleros:grub2-tools |
huawei | euleros | grub2-tools-extra | p-cpe:/a:huawei:euleros:grub2-tools-extra |
huawei | euleros | grub2-tools-minimal | p-cpe:/a:huawei:euleros:grub2-tools-minimal |
huawei | euleros | uvp | cpe:/o:huawei:euleros:uvp:2.9.1 |
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3695
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3696
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3697
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3981
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-28733
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-28734
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-28736
www.nessus.org/u?b3e39507
6.9 Medium
CVSS2
Attack Vector
LOCAL
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:L/AC:M/Au:N/C:C/I:C/A:C
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
7.6 High
AI Score
Confidence
Low
0.001 Low
EPSS
Percentile
26.5%