CVE-2022-3775
published 2022-12-19CVE-2022-3775: When rendering certain unicode sequences, grub2's font code doesn't proper validate if the informed glyph's width and height is constrained within bitmap size…
PriorityP335high7.1CVSS 3.1
AVLACLPRLUINSUCNIHAH
EPSS
1.04%
63.9th percentile
When rendering certain unicode sequences, grub2's font code doesn't proper validate if the informed glyph's width and height is constrained within bitmap size. As consequence an attacker can craft an input which will lead to a out-of-bounds write into grub2's heap, leading to memory corruption and availability issues. Although complex, arbitrary code execution could not be discarded.
Affected
28 ranges· showing 25
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | grub2 | < grub2 2.06-5 (bookworm) | grub2 2.06-5 (bookworm) |
| gnu | grub2 | <= 2.06 | — |
| gnu | grub2 | — | — |
| gnu | grub2 | >= 0 < 2.06-3~deb11u4 | 2.06-3~deb11u4 |
| gnu | grub2 | >= 0 < 2.06-5 | 2.06-5 |
| gnu | grub2 | >= 0 < 2.06-5 | 2.06-5 |
| gnu | grub2 | >= 0 < 2.06-5 | 2.06-5 |
| msrc | azure_linux_3.0_arm | — | — |
| msrc | azure_linux_3.0_x64 | — | — |
| msrc | cbl_mariner_1.0_arm | — | — |
| msrc | cbl_mariner_1.0_x64 | — | — |
| msrc | cbl_mariner_2.0_arm | — | — |
| msrc | cbl_mariner_2.0_x64 | — | — |
| msrc | windows_10 | — | — |
| msrc | windows_10_version_1607 | — | — |
| msrc | windows_10_version_1809 | — | — |
| msrc | windows_10_version_21h2 | — | — |
| msrc | windows_10_version_22h2 | — | — |
| msrc | windows_11_version_21h2 | — | — |
| msrc | windows_11_version_22h2 | — | — |
| msrc | windows_11_version_23h2 | — | — |
| msrc | windows_11_version_24h2 | — | — |
| msrc | windows_server_2012 | — | — |
| msrc | windows_server_2012_r2 | — | — |
| msrc | windows_server_2016 | — | — |
CVSS provenance
nvdv3.17.1HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
osv7.1HIGH
vendor_debian7.1HIGH
vendor_msrc7.1HIGH
vendor_redhat7.1HIGH
vendor_ubuntu4.5MEDIUM
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Microsoft
Redhat: CVE-2022-3775 grub2 - Heap based out-of-bounds write when rendering certain Unicode sequences
vendor_msrc·2024-08-13·CVSS 7.1
CVE-2022-3775 [HIGH] CWE-122 Redhat: CVE-2022-3775 grub2 - Heap based out-of-bounds write when rendering certain Unicode sequences
Redhat: CVE-2022-3775 grub2 - Heap based out-of-bounds write when rendering certain Unicode sequences
NIST NVD Details: https://nvd.nist.gov/vuln/detail/CVE-2022-3775
FAQ: Windows 11, version 24H2 is not generally available yet. Why are there updates for this version of Windows listed in the Security Updates table?
The new Copilot+ devices that are now publicly available come with Windows 11, version 24H2 installed. Customers with these devices need to know about any vulnerabilities that affect their machine and to install the updates if they are not receiving automatic updates. Note that the general availability date for Windows 11, version 24H2 is scheduled for later this year.
FAQ: Why is this Redhat CVE included in the Security Update Guide?
The vulnerability assigned to this CVE is
Ubuntu
GRUB2 vulnerabilities
vendor_ubuntu·2023-09-08·CVSS 4.5
CVE-2022-28737 [MEDIUM] GRUB2 vulnerabilities
Title: GRUB2 vulnerabilities
Summary: Several security issues were fixed in GRUB2.
Daniel Axtens discovered that specially crafted images could cause a
heap-based out-of-bonds write. A local attacker could possibly use
this to circumvent secure boot protections. (CVE-2021-3695)
Daniel Axtens discovered that specially crafted images could cause
out-of-bonds read and write. A local attacker could possibly use this
to circumvent secure boot protections. (CVE-2021-3696)
Daniel Axtens discovered that specially crafted images could cause
buffer underwrite which allows arbitrary data to be written to a heap.
A local attacker could possibly use this to circumvent secure
boot protections. (CVE-2021-3697)
It was discovered that GRUB2 configuration files were created with
the wrong permissions.
Microsoft
CVE-2022-3775: FAQ: Is Azure Linux the only Microsoft product that includes this open-source library and is therefore potentially affected by this vulnerability?
One
vendor_msrc·2022-12-13·CVSS 7.1
CVE-2022-3775 [HIGH] CVE-2022-3775: FAQ: Is Azure Linux the only Microsoft product that includes this open-source library and is therefore potentially affected by this vulnerability?
One
FAQ: Is Azure Linux the only Microsoft product that includes this open-source library and is therefore potentially affected by this vulnerability?
One of the main benefits to our customers who choose to use the Azure Linux distro is the commitment to keep it up to date with the most recent and most secure versions of the open source libraries with which the distro is composed. Microsoft is committed to transparency in this work which is why we began publishing CSAF/VEX in October 2025. See this blog post for more information. If impact to additional products is identified, we will update the CVE to reflect this.
Mariner: Mariner
[email protected]: [email protected]
Customer Action Required: Yes
Red Hat
grub2: Heap based out-of-bounds write when redering certain unicode sequences
vendor_redhat·2022-11-15·CVSS 7.1
CVE-2022-3775 [HIGH] CWE-787 grub2: Heap based out-of-bounds write when redering certain unicode sequences
grub2: Heap based out-of-bounds write when redering certain unicode sequences
When rendering certain unicode sequences, grub2's font code doesn't proper validate if the informed glyph's width and height is constrained within bitmap size. As consequence an attacker can craft an input which will lead to a out-of-bounds write into grub2's heap, leading to memory corruption and availability issues. Although complex, arbitrary code execution could not be discarded.
A flaw was found in the grub2 font code. When rendering certain unicode sequences, it fails to properly validate the font width and height. These values are further used to access the font buffer, causing possible out-of-bounds writes. A malicious actor may craft a font capable of triggering this issue, allowing modifications in un
Debian
CVE-2022-3775: grub2 - When rendering certain unicode sequences, grub2's font code doesn't proper valid...
vendor_debian·2022·CVSS 7.1
CVE-2022-3775 [HIGH] CVE-2022-3775: grub2 - When rendering certain unicode sequences, grub2's font code doesn't proper valid...
When rendering certain unicode sequences, grub2's font code doesn't proper validate if the informed glyph's width and height is constrained within bitmap size. As consequence an attacker can craft an input which will lead to a out-of-bounds write into grub2's heap, leading to memory corruption and availability issues. Although complex, arbitrary code execution could not be discarded.
Scope: local
bookworm: resolved (fixed in 2.06-5)
bullseye: resolved (fixed in 2.06-3~deb11u4)
forky: resolved (fixed in 2.06-5)
sid: resolved (fixed in 2.06-5)
trixie: resolved (fixed in 2.06-5)
OSV
grub2-signed, grub2-unsigned, shim, and shim-signed vulnerability
osv·2023-09-08·CVSS 4.5
CVE-2021-3695 [MEDIUM] grub2-signed, grub2-unsigned, shim, and shim-signed vulnerability
grub2-signed, grub2-unsigned, shim, and shim-signed vulnerability
Daniel Axtens discovered that specially crafted images could cause a
heap-based out-of-bonds write. A local attacker could possibly use
this to circumvent secure boot protections. (CVE-2021-3695)
Daniel Axtens discovered that specially crafted images could cause
out-of-bonds read and write. A local attacker could possibly use this
to circumvent secure boot protections. (CVE-2021-3696)
Daniel Axtens discovered that specially crafted images could cause
buffer underwrite which allows arbitrary data to be written to a heap.
A local attacker could possibly use this to circumvent secure
boot protections. (CVE-2021-3697)
It was discovered that GRUB2 configuration files were created with
the wrong permissions. An attacker could
OSV
CVE-2022-3775: When rendering certain unicode sequences, grub2's font code doesn't proper validate if the informed glyph's width and height is constrained within bit
osv·2022-12-19·CVSS 7.1
CVE-2022-3775 [HIGH] CVE-2022-3775: When rendering certain unicode sequences, grub2's font code doesn't proper validate if the informed glyph's width and height is constrained within bit
When rendering certain unicode sequences, grub2's font code doesn't proper validate if the informed glyph's width and height is constrained within bitmap size. As consequence an attacker can craft an input which will lead to a out-of-bounds write into grub2's heap, leading to memory corruption and availability issues. Although complex, arbitrary code execution could not be discarded.
GHSA
GHSA-8h84-vmjf-pcmj: When rendering certain unicode sequences, grub2's font code doesn't proper validate if the informed glyph's width and height is constrained within bit
ghsa_unreviewed·2022-12-19
CVE-2022-3775 [HIGH] CWE-787 GHSA-8h84-vmjf-pcmj: When rendering certain unicode sequences, grub2's font code doesn't proper validate if the informed glyph's width and height is constrained within bit
When rendering certain unicode sequences, grub2's font code doesn't proper validate if the informed glyph's width and height is constrained within bitmap size. As consequence an attacker can craft an input which will lead to a out-of-bounds write into grub2's heap, leading to memory corruption and availability issues. Although complex, arbitrary code execution could not be discarded.
No detection rules found.
No public exploits indexed.
Trendmicro
The August 2024 Security Update Review
blogs_trendmicro·2024-08-13·CVSS 6.7
[MEDIUM] The August 2024 Security Update Review
## The August 2024 Security Update Review
Get the August 2024 security update and review.
By: Dustin Childs 2024/08/13 Read time: ( words)
Save to Folio
I have successfully survived Summer Hacker Camp, and I hope you have too. And we return just in time for Patch Tuesday and a new crop of 0-days as Microsoft and Adobe have released their regularly scheduled updates. Take a break from your regular activities and join us as we review the details of their latest security alerts. If you’d rather watch the full video recap covering the entire release, you can check it out here:
CVE
Title
Severity
CVSS
Public
Exploited
Type
CVE-2024-38189
Microsoft Project Remote Code Execution Vulnerability
Important
8.8
No
Yes
RCE
CVE-2024-38178
Scripting Engine Memory Corruption Vulnerabil
Qualys
Microsoft and Adobe Patch Tuesday, August 2024 Security Update Review
blogs_qualys·2024-08-13·CVSS 6.7
[MEDIUM] Microsoft and Adobe Patch Tuesday, August 2024 Security Update Review
## Table of Contents
Microsoft Patch Tuesday for August 2024
Adobe Patches for August 2024
Zero-day Vulnerabilities Patched in August Patch Tuesday Edition
Critical Severity Vulnerabilities Patched in August Patch Tuesday Edition
Other Microsoft Vulnerability Highlights
Microsoft Release Summary
Discover and Prioritize Vulnerabilities in Vulnerability Management, Detection & Response (VMDR)
Rapid Response with Patch Management (PM)
EVALUATE Vendor-Suggested Mitigation with Policy Compliance (PC)
Qualys Monthly Webinar Series
Microsoft’s August Patch Tuesday updates are out, and they address a range of vulnerabilities across multiple products. Let’s dive into the key updates and their implications.
## Microsoft Patch Tuesday for August 2024
Microsoft Patch’s Tuesday, August 202
Qualys
Microsoft & Adobe August 2024 Patch Tuesday Updates | Qualys
blogs_qualys·2024-08-13·CVSS 6.7
[MEDIUM] Microsoft & Adobe August 2024 Patch Tuesday Updates | Qualys
#### Table of Contents
- Microsoft Patch Tuesday for August 2024
- Adobe Patches for August 2024
- Zero-day Vulnerabilities Patched in August Patch Tuesday Edition
- Critical Severity Vulnerabilities Patched in August Patch Tuesday Edition
- Other Microsoft Vulnerability Highlights
- Microsoft Release Summary
- Discover and Prioritize Vulnerabilities in Vulnerability Management, Detection & Response (VMDR)
- Rapid Response with Patch Management (PM)
- EVALUATE Vendor-Suggested Mitigation with Policy Compliance (PC)
- Qualys Monthly Webinar Series
Microsoft’s August Patch Tuesday updates are out, and they address a range of vulnerabilities across multiple products. Let’s dive into the key updates and their implications.
## Microsoft Patch Tuesday for August 2024
Microsoft Patch’s Tuesda
Bleepingcomputer
Microsoft August 2024 Patch Tuesday fixes 9 zero-days, 6 exploited
blogs_bleepingcomputer·2024-08-13·CVSS 7.5
[HIGH] Microsoft August 2024 Patch Tuesday fixes 9 zero-days, 6 exploited
## Microsoft August 2024 Patch Tuesday fixes 9 zero-days, 6 exploited
## Lawrence Abrams
36 Elevation of Privilege Vulnerabilities
4 Security Feature Bypass Vulnerabilities
28 Remote Code Execution Vulnerabilities
8 Information Disclosure Vulnerabilities
6 Denial of Service Vulnerabilities
7 Spoofing Vulnerabilities
The number of bugs listed above do not include Microsoft Edge flaws that were disclosed earlier this month.
To learn more about the non-security updates released today, you can review our dedicated articles on the new Windows 11 KB5041585 update and Windows 10 KB5041580 update .
## Ten zero-days disclosed
This month's Patch Tuesday fixes six actively exploited and three other publicly disclosed zero-day vulnerabilities. Another publicly disclosed zero-day remains unf
Trendmicro
The August 2024 Security Update Review
blogs_trendmicro·2024-08-13
The August 2024 Security Update Review
# The August 2024 Security Update Review
Get the August 2024 security update and review.
By: Dustin Childs
2024/08/13
Read time: ( words)
Save to Folio
I have successfully survived Summer Hacker Camp, and I hope you have too. And we return just in time for Patch Tuesday and a new crop of 0-days as Microsoft and Adobe have released their regularly scheduled updates. Take a break from your regular activities and join us as we review the details of their latest security alerts. If you’d rather watch the full video recap covering the entire release, you can check it out here:
Adobe Patches for August 2024
For August, Adobe released 11 security bulletins addressing 71 CVEs in Adobe Illustrator. Dimension, Photoshop, InDesign, Acrobat and Reader, Bridge, Substance 3D Stager, Commerce, InC
2022-12-19
Published