SB2022061570 - SUSE update for grub2
Published: June 15, 2022 Updated: July 20, 2022
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 6 secuirty vulnerabilities.
1) Out-of-bounds write (CVE-ID: CVE-2021-3695)
The vulnerability allows a local privileged user to bypass implemented security restrictions.
The vulnerability exists due to a boundary error when processing PNG grayscale images. A local privileged user can pass specially crafted PNG image to the application, trigger an out-of-bounds write error and potentially bypass secure boot protection mechanism.
2) Out-of-bounds write (CVE-ID: CVE-2021-3696)
The vulnerability allows a local privileged user to bypass implemented security restrictions.
The vulnerability exists due to a boundary error when handling Huffman tables in the PNG reader. A local privileged user can pass specially crafted PNG image to the application, trigger an out-of-bounds write error and potentially bypass secure boot protection mechanism.
3) Integer underflow (CVE-ID: CVE-2021-3697)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to integer underflow within the JPEG reader. A local privileged user can trigger an integer underflow and bypass secure boot protection mechanism.
4) Integer underflow (CVE-ID: CVE-2022-28733)
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to integer underflow when processing IP packets within the grub_net_recv_ip4_packets() function. A remote attacker can send specially crafted network traffic to the affected system, trigger an integer underflow and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
5) Out-of-bounds write (CVE-ID: CVE-2022-28734)
The vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to a boundary error when processing split HTTP headerst. A remote attacker can send specially crafted traffic to the affected system, trigger an out-of-bounds write and execute arbitrary code on the target system.
6) Use-after-free (CVE-ID: CVE-2022-28736)
The vulnerability allows a local user to bypass implemented security restrictions.
The vulnerability exists due to a use-after-free error in the grub_cmd_chainloader() function in chainloader command. A local privileged user can trigger a use-after-free error and bypass secure boot protection mechanism.
Remediation
Install update from vendor's website.