rhsa-2022_5096
Vulnerability from csaf_redhat
Published
2022-06-16 14:57
Modified
2024-11-06 01:05
Summary
Red Hat Security Advisory: grub2, mokutil, shim, and shim-unsigned-x64 security update
Notes
Topic
An update for grub2, mokutil, shim, and shim-unsigned-x64 is now available for Red Hat Enterprise Linux 8.4 Extended Update Support.
Red Hat Product Security has rated this update as having a security impact of Important. 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.
The shim package contains a first-stage UEFI boot loader that handles chaining to a trusted full boot loader under secure boot environments.
Security Fix(es):
* grub2: Integer underflow in grub_net_recv_ip4_packets (CVE-2022-28733)
* grub2: Crafted PNG grayscale images may lead to out-of-bounds write in heap (CVE-2021-3695)
* grub2: Crafted PNG image may lead to out-of-bound write during huffman table handling (CVE-2021-3696)
* grub2: Crafted JPEG image can lead to buffer underflow write in the heap (CVE-2021-3697)
* grub2: Out-of-bound write when handling split HTTP headers (CVE-2022-28734)
* grub2: shim_lock verifier allows non-kernel files to be loaded (CVE-2022-28735)
* grub2: use-after-free in grub_cmd_chainloader() (CVE-2022-28736)
* shim: Buffer overflow when loading crafted EFI images (CVE-2022-28737)
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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"category": "description",
"text": "A flaw was found in grub 2, where a crafted 16-bit grayscale PNG image may lead to an out-of-bounds write. This flaw allows an attacker to corrupt the data on the heap portion of the grub2\u0027s memory, leading to possible code execution and the circumvention of the secure boot mechanism.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "grub2: Crafted PNG grayscale images may lead to out-of-bounds write in heap",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "Due to the nature of the input and how it\u0027s processed, a successful attack is considered very complex to be executed, as the same value is written out of bounds three times in a row.",
"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-2021-3695"
},
{
"category": "external",
"summary": "RHBZ#1991685",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1991685"
},
{
"category": "external",
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"url": "https://www.cve.org/CVERecord?id=CVE-2021-3695"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2021-3695",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-3695"
}
],
"release_date": "2022-06-07T00:00:00+00:00",
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{
"category": "vendor_fix",
"date": "2022-06-16T14:57:56+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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"details": "Moderate"
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"title": "grub2: Crafted PNG grayscale images may lead to out-of-bounds write in heap"
},
{
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"cwe": {
"id": "CWE-787",
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{
"system_name": "Red Hat Bugzilla ID",
"text": "1991686"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in grub2 when handling a PNG image header. When decoding the data contained in the Huffman table at the PNG file header, an out-of-bounds write may happen on grub\u0027s heap.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "grub2: Crafted PNG image may lead to out-of-bound write during huffman table handling",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This vulnerability\u0027s impact on confidentiality, data integrity, and availability are considered low as a successful attack using this flaw is very complex.",
"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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{
"category": "self",
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"url": "https://access.redhat.com/security/cve/CVE-2021-3696"
},
{
"category": "external",
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"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1991686"
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{
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"url": "https://www.cve.org/CVERecord?id=CVE-2021-3696"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2021-3696",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-3696"
}
],
"release_date": "2022-06-07T00:00:00+00:00",
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{
"category": "vendor_fix",
"date": "2022-06-16T14:57:56+00:00",
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"title": "grub2: Crafted PNG image may lead to out-of-bound write during huffman table handling"
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{
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"cwe": {
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"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1991687"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in grub2 when handling JPEG images. This flaw allows an attacker to craft a malicious JPEG image, which leads to an underflow on a grub2\u0027s internal pointer, leading to a heap-based out-of-bounds write. Secure-boot mechanisms circumvention and arbitrary code execution may also be achievable.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "grub2: Crafted JPEG image can lead to buffer underflow write in the heap",
"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-2021-3697"
},
{
"category": "external",
"summary": "RHBZ#1991687",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1991687"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2021-3697",
"url": "https://www.cve.org/CVERecord?id=CVE-2021-3697"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2021-3697",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-3697"
}
],
"release_date": "2022-06-07T00:00:00+00:00",
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{
"category": "vendor_fix",
"date": "2022-06-16T14:57:56+00:00",
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{
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"text": "2083339"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in grub2 when handling IPv4 packets. This flaw allows an attacker to craft a malicious packet, triggering an integer underflow in grub code. Consequently, the memory allocation for handling the packet data may be smaller than the size needed. This issue causes an out-of-bands write during packet handling, compromising data integrity, confidentiality issues, a denial of service, and remote code execution.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "grub2: Integer underflow in grub_net_recv_ip4_packets",
"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-2022-28733"
},
{
"category": "external",
"summary": "RHBZ#2083339",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2083339"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2022-28733",
"url": "https://www.cve.org/CVERecord?id=CVE-2022-28733"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2022-28733",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-28733"
}
],
"release_date": "2022-06-07T00:00:00+00:00",
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{
"category": "vendor_fix",
"date": "2022-06-16T14:57:56+00:00",
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"title": "grub2: Integer underflow in grub_net_recv_ip4_packets"
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{
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"text": "2090463"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in grub2 when handling split HTTP headers. While processing a split HTTP header, grub2 wrongly advances its control pointer to the internal buffer by one position, which can lead to an out-of-bounds write. This flaw allows an attacker to leverage this issue by crafting a malicious set of HTTP packages making grub2 corrupt its internal memory metadata structure. This leads to data integrity and confidentiality issues or forces grub to crash, resulting in a denial of service attack.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "grub2: Out-of-bound write when handling split HTTP headers",
"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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{
"category": "self",
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"url": "https://access.redhat.com/security/cve/CVE-2022-28734"
},
{
"category": "external",
"summary": "RHBZ#2090463",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2090463"
},
{
"category": "external",
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"url": "https://www.cve.org/CVERecord?id=CVE-2022-28734"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2022-28734",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-28734"
}
],
"release_date": "2022-06-07T17:00:00+00:00",
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{
"category": "vendor_fix",
"date": "2022-06-16T14:57:56+00:00",
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{
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"text": "A flaw was found in grub2. The shim_lock verifier from grub2 allows non-kernel files to be loaded when secure boot is enabled, giving the possibility of unverified code or modules to be loaded when it should not be allowed.",
"title": "Vulnerability description"
},
{
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"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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{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2022-28735"
},
{
"category": "external",
"summary": "RHBZ#2090857",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2090857"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2022-28735",
"url": "https://www.cve.org/CVERecord?id=CVE-2022-28735"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2022-28735",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-28735"
}
],
"release_date": "2022-06-07T17:00:00+00:00",
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{
"category": "vendor_fix",
"date": "2022-06-16T14:57:56+00:00",
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"title": "grub2: shim_lock verifier allows non-kernel files to be loaded"
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{
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{
"system_name": "Red Hat Bugzilla ID",
"text": "2092613"
}
],
"notes": [
{
"category": "description",
"text": "A use-after-free vulnerability was found on grub2\u0027s chainloader command. This flaw allows an attacker to gain access to restricted data or cause arbitrary code execution if they can establish control from grub\u0027s memory allocation pattern.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "grub2: use-after-free in grub_cmd_chainloader()",
"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-2022-28736"
},
{
"category": "external",
"summary": "RHBZ#2092613",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2092613"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2022-28736",
"url": "https://www.cve.org/CVERecord?id=CVE-2022-28736"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2022-28736",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-28736"
}
],
"release_date": "2022-06-07T17:00:00+00:00",
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"category": "vendor_fix",
"date": "2022-06-16T14:57:56+00:00",
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"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2090899"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in shim during the handling of EFI executables. A crafted EFI image can lead to an overflow in shim. This flaw allows an attacker to perform an out-of-bounds write in memory. A successful attack can lead to data integrity, confidentiality issues, and arbitrary code execution.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "shim: Buffer overflow when loading crafted EFI images",
"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-2022-28737"
},
{
"category": "external",
"summary": "RHBZ#2090899",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2090899"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2022-28737",
"url": "https://www.cve.org/CVERecord?id=CVE-2022-28737"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2022-28737",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-28737"
}
],
"release_date": "2022-06-07T17:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2022-06-16T14:57:56+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-2022:5096"
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.3,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H",
"version": "3.1"
},
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],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "shim: Buffer overflow when loading crafted EFI images"
}
]
}
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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.