Red Hat Enterprise Linux 7.3 update for kernel



Published: 2021-08-31
Risk Low
Patch available YES
Number of vulnerabilities 2
CVE-ID CVE-2021-32399
CVE-2021-22555
CWE-ID CWE-362
CWE-787
Exploitation vector Local
Public exploit Public exploit code for vulnerability #2 is available.
Vulnerable software
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kernel (Red Hat package)
Operating systems & Components / Operating system package or component

Red Hat Enterprise Linux Server - AUS
Operating systems & Components / Operating system

Vendor Red Hat Inc.

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Race condition

EUVDB-ID: #VU55257

Risk: Low

CVSSv3.1: 6.1 [CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-32399

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Exploit availability: No

Description

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

The vulnerability exists due to a race condition  for removal of the HCI controller within net/bluetooth/hci_request.c in the Linux kernel. A local user can exploit the race and gain unauthorized access to sensitive information and escalate privileges on the system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

kernel (Red Hat package): 3.10.0-123.1.2.el7, 3.10.0-123.4.2.el7, 3.10.0-123.4.4.el7, 3.10.0-123.6.3.el7, 3.10.0-123.8.1.el7, 3.10.0-123.9.2.el7, 3.10.0-123.13.1.el7, 3.10.0-123.13.2.el7, 3.10.0-229.20.1.el7, 3.10.0-229.24.2.el7, 3.10.0-229.26.2.el7, 3.10.0-229.38.1.el7, 3.10.0-229.40.1.el7, 3.10.0-229.42.2.el7, 3.10.0-229.46.1.el7, 3.10.0-229.48.1.el7, 3.10.0-229.49.1.el7, 3.10.0-229.el7, 3.10.0-327.3.1.el7, 3.10.0-327.4.5.el7, 3.10.0-327.10.1.el7, 3.10.0-327.18.2.el7, 3.10.0-327.22.2.el7, 3.10.0-327.28.2.el7, 3.10.0-327.28.3.el7, 3.10.0-327.36.1.el7, 3.10.0-327.36.2.el7, 3.10.0-327.36.3.el7, 3.10.0-327.41.3.el7, 3.10.0-327.46.1.el7, 3.10.0-327.49.2.el7, 3.10.0-327.53.1.el7, 3.10.0-327.55.2.el7, 3.10.0-327.58.1.el7, 3.10.0-327.59.2.el7, 3.10.0-327.59.3.el7, 3.10.0-327.61.3.el7, 3.10.0-327.62.4.el7, 3.10.0-327.66.1.el7, 3.10.0-327.66.3.el7, 3.10.0-327.66.5.el7, 3.10.0-327.71.1.el7, 3.10.0-327.71.4.el7, 3.10.0-327.73.1.el7, 3.10.0-327.76.1.el7, 3.10.0-327.78.2.el7, 3.10.0-327.79.2.el7, 3.10.0-327.82.1.el7, 3.10.0-327.82.2.el7, 3.10.0-327.83.1.el7, 3.10.0-327.85.1.el7, 3.10.0-327.86.1.el7, 3.10.0-327.88.1.el7, 3.10.0-327.89.1.el7, 3.10.0-327.90.2.el7, 3.10.0-327.93.1.el7, 3.10.0-327.96.1.el7, 3.10.0-327.98.2.el7, 3.10.0-327.el7, 3.10.0-514.6.1.el7, 3.10.0-514.6.2.el7, 3.10.0-514.10.2.el7, 3.10.0-514.16.1.el7, 3.10.0-514.21.1.el7, 3.10.0-514.21.2.el7, 3.10.0-514.26.1.el7, 3.10.0-514.28.1.el7, 3.10.0-514.28.2.el7, 3.10.0-514.32.2.el7, 3.10.0-514.32.3.el7, 3.10.0-514.41.1.el7, 3.10.0-514.44.1.el7, 3.10.0-514.48.1.el7, 3.10.0-514.48.3.el7, 3.10.0-514.48.5.el7, 3.10.0-514.51.1.el7, 3.10.0-514.53.1.el7, 3.10.0-514.55.4.el7, 3.10.0-514.58.1.el7, 3.10.0-514.61.1.el7, 3.10.0-514.64.2.el7, 3.10.0-514.66.2.el7, 3.10.0-514.69.1.el7, 3.10.0-514.70.1.el7, 3.10.0-514.70.2.el7, 3.10.0-514.70.3.el7, 3.10.0-514.71.1.el7, 3.10.0-514.72.1.el7, 3.10.0-514.73.1.el7, 3.10.0-514.74.1.el7, 3.10.0-514.76.1.el7, 3.10.0-514.78.1.el7, 3.10.0-514.85.1.el7, 3.10.0-514.86.1.el7, 3.10.0-514.88.1.el7, 3.10.0-514.89.1.el7, 3.10.0-514.90.2.el7

Red Hat Enterprise Linux Server - AUS: 7.3

CPE2.3 External links

http://access.redhat.com/errata/RHSA-2021:3321

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: #VU56017

Risk: Low

CVSSv3.1: 6.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-22555

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

Exploit availability: Yes

Description

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

The vulnerability exists due to a boundary error when processing untrusted input in net/netfilter/x_tables.c in Linux kernel. A local user can run a specially crafted program to trigger an out-of-bounds write and execute arbitrary code with elevated privileges.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

kernel (Red Hat package): 3.10.0-123.1.2.el7, 3.10.0-123.4.2.el7, 3.10.0-123.4.4.el7, 3.10.0-123.6.3.el7, 3.10.0-123.8.1.el7, 3.10.0-123.9.2.el7, 3.10.0-123.13.1.el7, 3.10.0-123.13.2.el7, 3.10.0-229.20.1.el7, 3.10.0-229.24.2.el7, 3.10.0-229.26.2.el7, 3.10.0-229.38.1.el7, 3.10.0-229.40.1.el7, 3.10.0-229.42.2.el7, 3.10.0-229.46.1.el7, 3.10.0-229.48.1.el7, 3.10.0-229.49.1.el7, 3.10.0-229.el7, 3.10.0-327.3.1.el7, 3.10.0-327.4.5.el7, 3.10.0-327.10.1.el7, 3.10.0-327.18.2.el7, 3.10.0-327.22.2.el7, 3.10.0-327.28.2.el7, 3.10.0-327.28.3.el7, 3.10.0-327.36.1.el7, 3.10.0-327.36.2.el7, 3.10.0-327.36.3.el7, 3.10.0-327.41.3.el7, 3.10.0-327.46.1.el7, 3.10.0-327.49.2.el7, 3.10.0-327.53.1.el7, 3.10.0-327.55.2.el7, 3.10.0-327.58.1.el7, 3.10.0-327.59.2.el7, 3.10.0-327.59.3.el7, 3.10.0-327.61.3.el7, 3.10.0-327.62.4.el7, 3.10.0-327.66.1.el7, 3.10.0-327.66.3.el7, 3.10.0-327.66.5.el7, 3.10.0-327.71.1.el7, 3.10.0-327.71.4.el7, 3.10.0-327.73.1.el7, 3.10.0-327.76.1.el7, 3.10.0-327.78.2.el7, 3.10.0-327.79.2.el7, 3.10.0-327.82.1.el7, 3.10.0-327.82.2.el7, 3.10.0-327.83.1.el7, 3.10.0-327.85.1.el7, 3.10.0-327.86.1.el7, 3.10.0-327.88.1.el7, 3.10.0-327.89.1.el7, 3.10.0-327.90.2.el7, 3.10.0-327.93.1.el7, 3.10.0-327.96.1.el7, 3.10.0-327.98.2.el7, 3.10.0-327.el7, 3.10.0-514.6.1.el7, 3.10.0-514.6.2.el7, 3.10.0-514.10.2.el7, 3.10.0-514.16.1.el7, 3.10.0-514.21.1.el7, 3.10.0-514.21.2.el7, 3.10.0-514.26.1.el7, 3.10.0-514.28.1.el7, 3.10.0-514.28.2.el7, 3.10.0-514.32.2.el7, 3.10.0-514.32.3.el7, 3.10.0-514.41.1.el7, 3.10.0-514.44.1.el7, 3.10.0-514.48.1.el7, 3.10.0-514.48.3.el7, 3.10.0-514.48.5.el7, 3.10.0-514.51.1.el7, 3.10.0-514.53.1.el7, 3.10.0-514.55.4.el7, 3.10.0-514.58.1.el7, 3.10.0-514.61.1.el7, 3.10.0-514.64.2.el7, 3.10.0-514.66.2.el7, 3.10.0-514.69.1.el7, 3.10.0-514.70.1.el7, 3.10.0-514.70.2.el7, 3.10.0-514.70.3.el7, 3.10.0-514.71.1.el7, 3.10.0-514.72.1.el7, 3.10.0-514.73.1.el7, 3.10.0-514.74.1.el7, 3.10.0-514.76.1.el7, 3.10.0-514.78.1.el7, 3.10.0-514.85.1.el7, 3.10.0-514.86.1.el7, 3.10.0-514.88.1.el7, 3.10.0-514.89.1.el7, 3.10.0-514.90.2.el7

Red Hat Enterprise Linux Server - AUS: 7.3

CPE2.3 External links

http://access.redhat.com/errata/RHSA-2021:3321

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.



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