CVE-2022-28733

Publication date 20 July 2023

Last updated 24 July 2024

Ubuntu priority

Cvss 3 Severity Score

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 small integer number which will be used in memory allocation. If the attack succeeds in such way, subsequent operations can write past the end of the buffer.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
grub2	24.04 LTS noble	Not affected
	23.10 mantic	Not affected
	23.04 lunar	Not affected
	22.10 kinetic	Not affected
	22.04 LTS jammy	Not affected
	21.10 impish	Ignored
	20.04 LTS focal	Not affected
	18.04 LTS bionic	Not affected
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Not affected
grub2-signed	24.04 LTS noble	Not affected
	23.10 mantic	Not affected
	23.04 lunar	Not affected
	22.10 kinetic	Ignored
	22.04 LTS jammy	Fixed 1.187.3~22.04.1
	20.04 LTS focal	Fixed 1.187.3~20.04.1
	18.04 LTS bionic	Fixed 1.187.3~18.04.1
	16.04 LTS xenial	Vulnerable
	14.04 LTS trusty	Needs evaluation
grub2-unsigned	24.04 LTS noble	Not affected
	23.10 mantic	Not affected
	23.04 lunar	Not affected
	22.10 kinetic	Ignored
	22.04 LTS jammy	Fixed 2.06-2ubuntu14.1
	20.04 LTS focal	Fixed 2.06-2ubuntu14.1
	18.04 LTS bionic	Fixed 2.06-2ubuntu14.1
	16.04 LTS xenial	Vulnerable
	14.04 LTS trusty	Not in release

Notes

eslerm

CWE-191

Severity score breakdown

Parameter	Value
Base score	8.1 · High
Attack vector	Network
Attack complexity	High
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Related Ubuntu Security Notices (USN)

USN-6355-1
GRUB2 vulnerabilities
8 September 2023