rhsa-2021_2790
Vulnerability from csaf_redhat
Published
2021-07-20 22:22
Modified
2024-11-05 23:47
Summary
Red Hat Security Advisory: shim and fwupd security update
Notes
Topic
An update for fwupd, shim, shim-unsigned-aarch64, and shim-unsigned-x64 is now available for Red Hat Enterprise Linux 8.2 Extended Update Support.
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 shim package contains a first-stage UEFI boot loader that handles chaining to a trusted full boot loader under secure boot environments.
The fwupd packages provide a service that allows session software to update device firmware.
The following packages have been upgraded to a later upstream version: shim (15.4). (BZ#1932411)
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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"text": "The shim package contains a first-stage UEFI boot loader that handles chaining to a trusted full boot loader under secure boot environments.\n\nThe fwupd packages provide a service that allows session software to update device firmware.\n\nThe following packages have been upgraded to a later upstream version: shim (15.4). (BZ#1932411)\n\nSecurity Fix(es):\n\n* grub2: acpi command allows privileged user to load crafted ACPI tables when Secure Boot is enabled (CVE-2020-14372)\n\n* grub2: Use-after-free in rmmod command (CVE-2020-25632)\n\n* grub2: Out-of-bounds write in grub_usb_device_initialize() (CVE-2020-25647)\n\n* grub2: Stack buffer overflow in grub_parser_split_cmdline() (CVE-2020-27749)\n\n* grub2: cutmem command allows privileged user to remove memory regions when Secure Boot is enabled (CVE-2020-27779)\n\n* grub2: Heap out-of-bounds write in short form option parser (CVE-2021-20225)\n\n* grub2: Heap out-of-bounds write due to miscalculation of space required for quoting (CVE-2021-20233)\n\nFor 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.",
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"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"
}
],
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"references": [
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"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": "2021-07-20T22:22:30+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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}
],
"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.