Summary
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.
Fixed packages 3
| Release | Package | Fixed in |
|---|---|---|
| Rocky Linux · 9 | mokutil | 2:0.4.0-8.el9_0.1 |
| Rocky Linux · 9 | shim | 0:15.6-1.el9 |
| Rocky Linux · 9 | shim | 0:15.6-1.el9.rocky.0.1 |
Vulnerabilities 8
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High 8.1
Integer underflow in grub_net_recv_ip4_packets
Integer underflow in grub_net_recv_ip4_packets; A malicious crafted IP packet can lead to an integer underflow in grub_net_recv_ip4_packets() function on rsm->total_len value. Under certain circumstances the total_len value may end up wrapping around to a sma…
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High 8.1
Out-of-bounds write when handling split HTTP headers
Out-of-bounds write when handling split HTTP headers; When handling split HTTP headers, GRUB2 HTTP code accidentally moves its internal data buffer point by one position. This can lead to a out-of-bound write further when parsing the HTTP request, writing a N…
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Medium 6.7
The GRUB2's shim_lock verifier allows non-kernel files to be loaded on shim-powered secure boot systems. Allowing such …
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Medium 6.5
There's a possible overflow in handle_image() when shim tries to load and execute crafted EFI executables
There's a possible overflow in handle_image() when shim tries to load and execute crafted EFI executables; The handle_image() function takes into account the SizeOfRawData field from each section to be loaded. An attacker can leverage this to perform out-of-b…
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Medium 6.4
There's a use-after-free vulnerability in grub_cmd_chainloader() function
There's a use-after-free vulnerability in grub_cmd_chainloader() function; The chainloader command is used to boot up operating systems that doesn't support multiboot and do not have direct support from GRUB2. When executing chainloader more than once a use-a…
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Unscored —
A crafted 16-bit grayscale PNG image may lead to a out-of-bounds write in the heap area. An attacker may take advantage…
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Unscored —
A heap out-of-bounds write may heppen during the handling of Huffman tables in the PNG reader. This may lead to data co…
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Unscored —
A crafted JPEG image may lead the JPEG reader to underflow its data pointer, allowing user-controlled data to be writte…
References
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report
https://bugzilla.redhat.com/show_bug.cgi?id=1991685
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report
https://bugzilla.redhat.com/show_bug.cgi?id=1991686
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report
https://bugzilla.redhat.com/show_bug.cgi?id=1991687
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report
https://bugzilla.redhat.com/show_bug.cgi?id=2083339
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report
https://bugzilla.redhat.com/show_bug.cgi?id=2090463
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report
https://bugzilla.redhat.com/show_bug.cgi?id=2090857
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report
https://bugzilla.redhat.com/show_bug.cgi?id=2090899
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report
https://bugzilla.redhat.com/show_bug.cgi?id=2092613