rhsa-2021_0702
Vulnerability from csaf_redhat
Published
2021-03-02 20:14
Modified
2024-11-05 23:19
Summary
Red Hat Security Advisory: grub2 security update
Notes
Topic
An update for grub2 is now available for Red Hat Enterprise Linux 7.4 Advanced Update Support, Red Hat Enterprise Linux 7.4 Telco Extended Update Support, and Red Hat Enterprise Linux 7.4 Update Services for SAP Solutions.
Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details
The grub2 packages provide version 2 of the Grand Unified Boot Loader (GRUB), a highly configurable and customizable boot loader with modular architecture. The packages support a variety of kernel formats, file systems, computer architectures, and hardware devices.
Security Fix(es):
* grub2: acpi command allows privileged user to load crafted ACPI tables when Secure Boot is enabled (CVE-2020-14372)
* grub2: Use-after-free in rmmod command (CVE-2020-25632)
* grub2: Out-of-bounds write in grub_usb_device_initialize() (CVE-2020-25647)
* grub2: Stack buffer overflow in grub_parser_split_cmdline() (CVE-2020-27749)
* grub2: cutmem command allows privileged user to remove memory regions when Secure Boot is enabled (CVE-2020-27779)
* grub2: Heap out-of-bounds write in short form option parser (CVE-2021-20225)
* grub2: Heap out-of-bounds write due to miscalculation of space required for quoting (CVE-2021-20233)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Terms of Use
This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
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"name": "Incomplete List of Disallowed Inputs"
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"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1873150"
}
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{
"category": "description",
"text": "A flaw was found in GRUB 2, where it incorrectly enables the usage of the ACPI command when Secure Boot is enabled. This flaw allows an attacker with privileged access to craft a Secondary System Description Table (SSDT) containing code to overwrite the Linux kernel lockdown variable content directly into memory. The kernel further loads and executes the table, defeating its Secure Boot lockdown and allowing the attacker to load unsigned code.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "grub2: acpi command allows privileged user to load crafted ACPI tables when Secure Boot is enabled",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "For a successful attack to occur, the attacker needs to triage the environment to determine where the lockdown variable symbol is placed in memory when the kernel is loaded. Then the SSDT table needs to be written accordingly into this memory position and the grub.cfg file needs to be changed to load the table during the boot time.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2020-14372"
},
{
"category": "external",
"summary": "RHBZ#1873150",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1873150"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2020-14372",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-14372"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2020-14372",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-14372"
},
{
"category": "external",
"summary": "https://access.redhat.com/security/vulnerabilities/RHSB-2021-003",
"url": "https://access.redhat.com/security/vulnerabilities/RHSB-2021-003"
}
],
"release_date": "2021-03-02T18:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2021-03-02T20:14:17+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2021:0702"
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "HIGH",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H",
"version": "3.1"
},
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],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "grub2: acpi command allows privileged user to load crafted ACPI tables when Secure Boot is enabled"
},
{
"cve": "CVE-2020-25632",
"cwe": {
"id": "CWE-416",
"name": "Use After Free"
},
"discovery_date": "2020-09-16T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1879577"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in grub2. The rmmod implementation allows the unloading of a module used as a dependency without checking if any other dependent module is still loaded leading to a use-after-free scenario. This could allow arbitrary code to be executed or a bypass of Secure Boot protections. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "grub2: Use-after-free in rmmod command",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"product_status": {
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2020-25632"
},
{
"category": "external",
"summary": "RHBZ#1879577",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1879577"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2020-25632",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-25632"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2020-25632",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-25632"
}
],
"release_date": "2021-03-02T18:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2021-03-02T20:14:17+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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"url": "https://access.redhat.com/errata/RHSA-2021:0702"
}
],
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{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "HIGH",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H",
"version": "3.1"
},
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],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "grub2: Use-after-free in rmmod command"
},
{
"acknowledgments": [
{
"names": [
"Joseph Tartaro",
"Ilja van Sprundel"
],
"organization": "IOActive"
}
],
"cve": "CVE-2020-25647",
"cwe": {
"id": "CWE-787",
"name": "Out-of-bounds Write"
},
"discovery_date": "2020-10-09T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1886936"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in grub2. During USB device initialization, descriptors are read with very little bounds checking and assumes the USB device is providing sane values. If properly exploited, an attacker could trigger memory corruption leading to arbitrary code execution allowing a bypass of the Secure Boot mechanism. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "grub2: Out-of-bounds write in grub_usb_device_initialize()",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"product_status": {
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2020-25647"
},
{
"category": "external",
"summary": "RHBZ#1886936",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1886936"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2020-25647",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-25647"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2020-25647",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-25647"
}
],
"release_date": "2021-03-02T18:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2021-03-02T20:14:17+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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},
"url": "https://access.redhat.com/errata/RHSA-2021:0702"
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "PHYSICAL",
"availabilityImpact": "HIGH",
"baseScore": 7.6,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
"version": "3.1"
},
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],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "grub2: Out-of-bounds write in grub_usb_device_initialize()"
},
{
"acknowledgments": [
{
"names": [
"Chris Coulson"
],
"organization": "Canonical"
}
],
"cve": "CVE-2020-27749",
"cwe": {
"id": "CWE-121",
"name": "Stack-based Buffer Overflow"
},
"discovery_date": "2020-11-20T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1899966"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in grub2. Variable names present are expanded in the supplied command line into their corresponding variable contents, using a 1kB stack buffer for temporary storage, without sufficient bounds checking. If the function is called with a command line that references a variable with a sufficiently large payload, it is possible to overflow the stack buffer, corrupt the stack frame and control execution which could also circumvent Secure Boot protections. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "grub2: Stack buffer overflow in grub_parser_split_cmdline()",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"product_status": {
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},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2020-27749"
},
{
"category": "external",
"summary": "RHBZ#1899966",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1899966"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2020-27749",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-27749"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2020-27749",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-27749"
}
],
"release_date": "2021-03-02T18:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2021-03-02T20:14:17+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "HIGH",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H",
"version": "3.1"
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"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "grub2: Stack buffer overflow in grub_parser_split_cmdline()"
},
{
"cve": "CVE-2020-27779",
"cwe": {
"id": "CWE-285",
"name": "Improper Authorization"
},
"discovery_date": "2020-11-20T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1900698"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in grub2. The cutmem command does not honor secure boot locking allowing an privileged attacker to remove address ranges from memory creating an opportunity to circumvent SecureBoot protections after proper triage about grub\u0027s memory layout. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "grub2: cutmem command allows privileged user to remove memory regions when Secure Boot is enabled",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2020-27779"
},
{
"category": "external",
"summary": "RHBZ#1900698",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1900698"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2020-27779",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-27779"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2020-27779",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-27779"
}
],
"release_date": "2021-03-02T18:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2021-03-02T20:14:17+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2021:0702"
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "HIGH",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H",
"version": "3.1"
},
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"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "grub2: cutmem command allows privileged user to remove memory regions when Secure Boot is enabled"
},
{
"cve": "CVE-2021-20225",
"cwe": {
"id": "CWE-787",
"name": "Out-of-bounds Write"
},
"discovery_date": "2021-02-03T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1924696"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in grub2. The option parser allows an attacker to write past the end of a heap-allocated buffer by calling certain commands with a large number of specific short forms of options. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "grub2: Heap out-of-bounds write in short form option parser",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2021-20225"
},
{
"category": "external",
"summary": "RHBZ#1924696",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1924696"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2021-20225",
"url": "https://www.cve.org/CVERecord?id=CVE-2021-20225"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2021-20225",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-20225"
}
],
"release_date": "2021-03-02T18:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2021-03-02T20:14:17+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2021:0702"
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "HIGH",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H",
"version": "3.1"
},
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],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "grub2: Heap out-of-bounds write in short form option parser"
},
{
"cve": "CVE-2021-20233",
"cwe": {
"id": "CWE-787",
"name": "Out-of-bounds Write"
},
"discovery_date": "2021-02-08T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1926263"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in grub2. Setparam_prefix() in the menu rendering code performs a length calculation on the assumption that expressing a quoted single quote will require 3 characters, while it actually requires 4 characters which allows an attacker to corrupt memory by one byte for each quote in the input. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "grub2: Heap out-of-bounds write due to miscalculation of space required for quoting",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"product_status": {
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2021-20233"
},
{
"category": "external",
"summary": "RHBZ#1926263",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1926263"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2021-20233",
"url": "https://www.cve.org/CVERecord?id=CVE-2021-20233"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2021-20233",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-20233"
}
],
"release_date": "2021-03-02T18:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2021-03-02T20:14:17+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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"url": "https://access.redhat.com/errata/RHSA-2021:0702"
}
],
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{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "HIGH",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H",
"version": "3.1"
},
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]
}
],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "grub2: Heap out-of-bounds write due to miscalculation of space required for quoting"
}
]
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.