Red Hat Enterprise Linux 8.1 Extended Update Support update for kpatch-patch

Published: 2020-10-26

Risk	Low
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2020-14385 CVE-2020-14386
CWE-ID	CWE-119 CWE-787
Exploitation vector	Local
Public exploit	Public exploit code for vulnerability #2 is available.
Vulnerable software Subscribe	Red Hat Enterprise Linux for Power, little endian - Extended Update Support Operating systems & Components / Operating system Red Hat Enterprise Linux for x86_64 - Extended Update Support Operating systems & Components / Operating system kpatch-patch-4_18_0-147_8_1 (Red Hat package) Operating systems & Components / Operating system package or component kpatch-patch-4_18_0-147_5_1 (Red Hat package) Operating systems & Components / Operating system package or component kpatch-patch-4_18_0-147_3_1 (Red Hat package) Operating systems & Components / Operating system package or component kpatch-patch-4_18_0-147_27_1 (Red Hat package) Operating systems & Components / Operating system package or component kpatch-patch-4_18_0-147_24_2 (Red Hat package) Operating systems & Components / Operating system package or component kpatch-patch-4_18_0-147_20_1 (Red Hat package) Operating systems & Components / Operating system package or component kpatch-patch-4_18_0-147_13_2 (Red Hat package) Operating systems & Components / Operating system package or component kpatch-patch-4_18_0-147_0_3 (Red Hat package) Operating systems & Components / Operating system package or component kpatch-patch-4_18_0-147_0_2 (Red Hat package) Operating systems & Components / Operating system package or component kpatch-patch-4_18_0-147 (Red Hat package) Operating systems & Components / Operating system package or component
Vendor	Red Hat Inc.

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Buffer overflow

EUVDB-ID: #VU58841

Risk: Low

CVSSv3.1: 5.7 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-14385

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to a boundary error in the file system metadata validator in XFS. A local user can cause an inode with a valid, user-creatable extended attribute to be flagged as corrupt and shutdown the the filesystem.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Red Hat Enterprise Linux for Power, little endian - Extended Update Support: 8.1

Red Hat Enterprise Linux for x86_64 - Extended Update Support: 8.1

kpatch-patch-4_18_0-147_8_1 (Red Hat package): before 1-7.el8_1

kpatch-patch-4_18_0-147_5_1 (Red Hat package): before 1-9.el8_1

kpatch-patch-4_18_0-147_3_1 (Red Hat package): before 1-14.el8_1

kpatch-patch-4_18_0-147_27_1 (Red Hat package): before 1-2.el8_1

kpatch-patch-4_18_0-147_24_2 (Red Hat package): before 1-2.el8_1

kpatch-patch-4_18_0-147_20_1 (Red Hat package): before 1-4.el8_1

kpatch-patch-4_18_0-147_13_2 (Red Hat package): before 1-5.el8_1

kpatch-patch-4_18_0-147_0_3 (Red Hat package): before 1-14.el8

kpatch-patch-4_18_0-147_0_2 (Red Hat package): before 1-14.el8

kpatch-patch-4_18_0-147 (Red Hat package): before 1-18.el8

External links

http://access.redhat.com/errata/RHSA-2020:4332

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 write

EUVDB-ID: #VU47051

Risk: Low

CVSSv3.1: 6 [CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2020-14386

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

Exploit availability: Yes

Description

The vulnerability allows a local privileged user to execute arbitrary code.

A flaw was found in the Linux kernel before 5.9-rc4. Memory corruption can be exploited to gain root privileges from unprivileged processes. The highest threat from this vulnerability is to data confidentiality and integrity.