rhsa-2022_5099
Vulnerability from csaf_redhat
Published
2022-06-16 15:26
Modified
2024-11-22 19:29
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 9.
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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"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.",
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{
"category": "self",
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"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",
"summary": "https://www.cve.org/CVERecord?id=CVE-2021-3695",
"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"
}
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"category": "vendor_fix",
"date": "2022-06-16T15:26:44+00:00",
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{
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"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"
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{
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"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",
"summary": "RHBZ#1991686",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1991686"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2021-3696",
"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"
}
],
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{
"category": "vendor_fix",
"date": "2022-06-16T15:26:44+00:00",
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{
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"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"
},
{
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"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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{
"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"
}
],
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"date": "2022-06-16T15:26:44+00:00",
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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",
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},
{
"category": "external",
"summary": "RHBZ#2083339",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2083339"
},
{
"category": "external",
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"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"
}
],
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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.",
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},
{
"category": "external",
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"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2090463"
},
{
"category": "external",
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},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2022-28734",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-28734"
}
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"title": "Vulnerability summary"
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{
"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.",
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{
"category": "self",
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},
{
"category": "external",
"summary": "RHBZ#2090857",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2090857"
},
{
"category": "external",
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"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"
}
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{
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"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.",
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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.",
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},
{
"category": "external",
"summary": "RHBZ#2092613",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2092613"
},
{
"category": "external",
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},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2022-28736",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-28736"
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"ids": [
{
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"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": "2022-06-16T15:26:44+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-2022:5099"
}
],
"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.