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CVE-2021-3695

Status Candidate

Overview

A crafted 16-bit grayscale PNG image may lead to a out-of-bounds write in the heap area. An attacker may take advantage of that to cause heap data corruption or eventually arbitrary code execution and circumvent secure boot protections. This issue has a high complexity to be exploited as an attacker needs to perform some triage over the heap layout to achieve signifcant results, also the values written into the memory are repeated three times in a row making difficult to produce valid payloads. This flaw affects grub2 versions prior grub-2.12.

Related Files

Red Hat Security Advisory 2022-5531-01
Posted Jul 27, 2022
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2022-5531-01 - Red Hat Advanced Cluster Management for Kubernetes 2.5.1 General Availability release images, which fix security issues and bugs.

tags | advisory
systems | linux, redhat
advisories | CVE-2020-28915, CVE-2021-3695, CVE-2021-3696, CVE-2021-3697, CVE-2021-40528, CVE-2022-1271, CVE-2022-1621, CVE-2022-1629, CVE-2022-22576, CVE-2022-24450, CVE-2022-25313, CVE-2022-25314, CVE-2022-27666, CVE-2022-27774
SHA-256 | f41ee848b6d0c115a722f77ecc6e1af8a8aefc16c64c38321266f8cf8d547612
Red Hat Security Advisory 2022-5099-01
Posted Jun 20, 2022
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2022-5099-01 - The grub2 packages provide version 2 of the Grand Unified Boot Loader, 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. Issues addressed include buffer overflow, out of bounds write, and use-after-free vulnerabilities.

tags | advisory, overflow, kernel, vulnerability
systems | linux, redhat
advisories | CVE-2021-3695, CVE-2021-3696, CVE-2021-3697, CVE-2022-28733, CVE-2022-28734, CVE-2022-28735, CVE-2022-28736, CVE-2022-28737
SHA-256 | 34246ffd9ca1956890fda4c9acb6dd38a6ae9f42ef9783e9b8715b92cd6d5e58
Red Hat Security Advisory 2022-5100-01
Posted Jun 20, 2022
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2022-5100-01 - The grub2 packages provide version 2 of the Grand Unified Boot Loader, 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. Issues addressed include buffer overflow, out of bounds write, and use-after-free vulnerabilities.

tags | advisory, overflow, kernel, vulnerability
systems | linux, redhat
advisories | CVE-2021-3695, CVE-2021-3696, CVE-2021-3697, CVE-2022-28733, CVE-2022-28734, CVE-2022-28735, CVE-2022-28736, CVE-2022-28737
SHA-256 | 4ae68bf8d9609c4f243193d9fe7abc4a8a8aa94b680c713f385e474d83725f7a
Red Hat Security Advisory 2022-5095-01
Posted Jun 20, 2022
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2022-5095-01 - The grub2 packages provide version 2 of the Grand Unified Boot Loader, 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. Issues addressed include buffer overflow, out of bounds write, and use-after-free vulnerabilities.

tags | advisory, overflow, kernel, vulnerability
systems | linux, redhat
advisories | CVE-2021-3695, CVE-2021-3696, CVE-2021-3697, CVE-2022-28733, CVE-2022-28734, CVE-2022-28735, CVE-2022-28736, CVE-2022-28737
SHA-256 | 4c3ec629c4223eb162af5230c255c58930695266f861587bbbf2094a5e049e04
Red Hat Security Advisory 2022-5096-01
Posted Jun 20, 2022
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2022-5096-01 - The grub2 packages provide version 2 of the Grand Unified Boot Loader, 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. Issues addressed include buffer overflow, out of bounds write, and use-after-free vulnerabilities.

tags | advisory, overflow, kernel, vulnerability
systems | linux, redhat
advisories | CVE-2021-3695, CVE-2021-3696, CVE-2021-3697, CVE-2022-28733, CVE-2022-28734, CVE-2022-28735, CVE-2022-28736, CVE-2022-28737
SHA-256 | 599b664c81a5612e99f1e4c5c07ad0f0223b8a2bc5a4d147cae39fb875d1c284
Red Hat Security Advisory 2022-5098-01
Posted Jun 20, 2022
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2022-5098-01 - The grub2 packages provide version 2 of the Grand Unified Boot Loader, 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. Issues addressed include buffer overflow, out of bounds write, and use-after-free vulnerabilities.

tags | advisory, overflow, kernel, vulnerability
systems | linux, redhat
advisories | CVE-2021-3695, CVE-2021-3696, CVE-2021-3697, CVE-2022-28733, CVE-2022-28734, CVE-2022-28735, CVE-2022-28736, CVE-2022-28737
SHA-256 | eb5658310e362f002091a1f7f759c770aba64922b044eb6f3ef039ee02122cb7
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