Ubuntu update for edk2
| Risk | Low |
| Patch available | YES |
| Number of vulnerabilities | 2 |
| CVE-ID | CVE-2021-28210 CVE-2021-28211 |
| CWE-ID | CWE-674 CWE-122 |
| Exploitation vector | Local |
| Public exploit | N/A |
| Vulnerable software |
Ubuntu Operating systems & Components / Operating system qemu-efi-arm (Ubuntu package) Operating systems & Components / Operating system package or component qemu-efi-aarch64 (Ubuntu package) Operating systems & Components / Operating system package or component qemu-efi (Ubuntu package) Operating systems & Components / Operating system package or component ovmf (Ubuntu package) Operating systems & Components / Operating system package or component |
| Vendor | Canonical Ltd. |
Security Bulletin
This security bulletin contains information about 2 vulnerabilities.
1) Uncontrolled Recursion
EUVDB-ID: #VU62014
Risk: Low
CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]
CVE-ID: CVE-2021-28210
CWE-ID:
CWE-674 - Uncontrolled Recursion
Exploit availability: No
DescriptionThe vulnerability allows a local user to execute arbitrary code on the target system.
The vulnerability exists due to an unlimited recursion in DxeCore. A local user can execute arbitrary code on the target system.
MitigationUpdate the affected package edk2 to the latest version.
Vulnerable software versionsUbuntu: 20.04 - 20.10
qemu-efi-arm (Ubuntu package): before 0~20191122.bd85bf54-2ubuntu3.2
qemu-efi-aarch64 (Ubuntu package): before 0~20191122.bd85bf54-2ubuntu3.2
qemu-efi (Ubuntu package): before 0~20191122.bd85bf54-2ubuntu3.2
ovmf (Ubuntu package): before 0~20191122.bd85bf54-2ubuntu3.2
CPE2.3- cpe:2.3:o:canonical:ubuntu:20.04:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu:20.10:*:*:*:*:*:*:*
- cpe:2.3:a:canonical:qemu-efi-arm_ubuntu_package:*:*:*:*:*:ubuntu:*:*
- cpe:2.3:a:canonical:qemu-efi-aarch64_ubuntu_package:*:*:*:*:*:ubuntu:*:*
- cpe:2.3:a:canonical:qemu-efi_ubuntu_package:*:*:*:*:*:ubuntu:*:*
- cpe:2.3:a:canonical:ovmf_ubuntu_package:*:*:*:*:*:ubuntu:*:*
https://ubuntu.com/security/notices/USN-4923-1
Q & A
Can this vulnerability be exploited remotely?
No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
2) Heap-based buffer overflow
EUVDB-ID: #VU54481
Risk: Low
CVSSv4.0: 5.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]
CVE-ID: CVE-2021-28211
CWE-ID:
CWE-122 - Heap-based Buffer Overflow
Exploit availability: No
DescriptionThe vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a boundary error within the LzmaUefiDecompressGetInfo() function. A local user can run a specially crafted program to trigger a heap-based buffer overflow and execute arbitrary code with elevated privileges.
Update the affected package edk2 to the latest version.
Vulnerable software versionsUbuntu: 20.04 - 20.10
qemu-efi-arm (Ubuntu package): before 0~20191122.bd85bf54-2ubuntu3.2
qemu-efi-aarch64 (Ubuntu package): before 0~20191122.bd85bf54-2ubuntu3.2
qemu-efi (Ubuntu package): before 0~20191122.bd85bf54-2ubuntu3.2
ovmf (Ubuntu package): before 0~20191122.bd85bf54-2ubuntu3.2
CPE2.3- cpe:2.3:o:canonical:ubuntu:20.04:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu:20.10:*:*:*:*:*:*:*
- cpe:2.3:a:canonical:qemu-efi-arm_ubuntu_package:*:*:*:*:*:ubuntu:*:*
- cpe:2.3:a:canonical:qemu-efi-aarch64_ubuntu_package:*:*:*:*:*:ubuntu:*:*
- cpe:2.3:a:canonical:qemu-efi_ubuntu_package:*:*:*:*:*:ubuntu:*:*
- cpe:2.3:a:canonical:ovmf_ubuntu_package:*:*:*:*:*:ubuntu:*:*
https://ubuntu.com/security/notices/USN-4923-1
Q & A
Can this vulnerability be exploited remotely?
No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
