Ubuntu update for linux-oem-5.10



Risk Low
Patch available YES
Number of vulnerabilities 4
CVE-ID CVE-2021-33200
CVE-2021-29155
CVE-2021-31829
CVE-2021-3501
CWE-ID CWE-787
CWE-125
CWE-200
Exploitation vector Network
Public exploit Public exploit code for vulnerability #2 is available.
Vulnerable software
 Ubuntu
Operating systems & Components / Operating system

linux-image-oem-20.04b (Ubuntu package)
Operating systems & Components / Operating system package or component

linux-image-oem-20.04 (Ubuntu package)
Operating systems & Components / Operating system package or component

linux-image-5.10.0-1029-oem (Ubuntu package)
Operating systems & Components / Operating system package or component

Vendor Canonical Ltd.

Security Bulletin

This security bulletin contains information about 4 vulnerabilities.

1) Out-of-bounds write

EUVDB-ID: #VU87989

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-2021-33200

CWE-ID: CWE-787 - Out-of-bounds write

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a boundary error in kernel/bpf/verifier.c. A local user can trigger an out-of-bounds write and escalate privileges on the system.

Mitigation

Update the affected package linux-oem-5.10 to the latest version.

Vulnerable software versions

Ubuntu: 20.04

linux-image-oem-20.04b (Ubuntu package): before 5.10.0.1029.30

linux-image-oem-20.04 (Ubuntu package): before 5.10.0.1029.30

linux-image-5.10.0-1029-oem (Ubuntu package): before 5.10.0-1029.30

CPE2.3 External links

https://ubuntu.com/security/notices/USN-4983-1


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) Out-of-bounds read

EUVDB-ID: #VU67490

Risk: Low

CVSSv4.0: 5.2 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P/U:Clear]

CVE-ID: CVE-2021-29155

CWE-ID: CWE-125 - Out-of-bounds read

Exploit availability: Yes

Description

The vulnerability allows a local user to gain access to potentially sensitive information.

The vulnerability exists in retrieve_ptr_limit in kernel/bpf/verifier.c in the Linux kernel mechanism. A local, special user privileged (CAP_SYS_ADMIN) BPF program running on affected systems may bypass the protection, and execute speculatively out-of-bounds loads from the kernel memory.

Mitigation

Update the affected package linux-oem-5.10 to the latest version.

Vulnerable software versions

Ubuntu: 20.04

linux-image-oem-20.04b (Ubuntu package): before 5.10.0.1029.30

linux-image-oem-20.04 (Ubuntu package): before 5.10.0.1029.30

linux-image-5.10.0-1029-oem (Ubuntu package): before 5.10.0-1029.30

CPE2.3 External links

https://ubuntu.com/security/notices/USN-4983-1


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. However, proof of concept for this vulnerability is available.

3) Information disclosure

EUVDB-ID: #VU67181

Risk: Low

CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-31829

CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor

Exploit availability: No

Description

The vulnerability allows a local user to gain access to potentially sensitive information.

The vulnerability exists due to excessive data output in the Linux kernel's eBPF verification code. A local user can insert eBPF instructions, use the eBPF verifier to abuse a spectre-like flaw and infer all system memory.

Mitigation

Update the affected package linux-oem-5.10 to the latest version.

Vulnerable software versions

Ubuntu: 20.04

linux-image-oem-20.04b (Ubuntu package): before 5.10.0.1029.30

linux-image-oem-20.04 (Ubuntu package): before 5.10.0.1029.30

linux-image-5.10.0-1029-oem (Ubuntu package): before 5.10.0-1029.30

CPE2.3 External links

https://ubuntu.com/security/notices/USN-4983-1


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.

4) Out-of-bounds write

EUVDB-ID: #VU54316

Risk: Low

CVSSv4.0: 7.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-3501

CWE-ID: CWE-787 - Out-of-bounds write

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a boundary error in the KVM API in Linux kernel. A local user can run a specially crafted program to trigger an out-of-bounds write and escalate privileges on the system.

Mitigation

Update the affected package linux-oem-5.10 to the latest version.

Vulnerable software versions

Ubuntu: 20.04

linux-image-oem-20.04b (Ubuntu package): before 5.10.0.1029.30

linux-image-oem-20.04 (Ubuntu package): before 5.10.0.1029.30

linux-image-5.10.0-1029-oem (Ubuntu package): before 5.10.0-1029.30

CPE2.3 External links

https://ubuntu.com/security/notices/USN-4983-1


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



###SIDEBAR###