Red Hat Enterprise Linux for Real Time 7 update for kernel-rt



Published: 2021-04-06
Risk Low
Patch available YES
Number of vulnerabilities 3
CVE-ID CVE-2021-27363
CVE-2021-27364
CVE-2021-27365
CWE-ID CWE-200
CWE-264
CWE-119
Exploitation vector Local
Public exploit N/A
Vulnerable software
Subscribe 		kernel-rt (Red Hat package)
Operating systems & Components / Operating system package or component

Red Hat Enterprise Linux for Real Time
Operating systems & Components / Operating system

Red Hat Enterprise Linux for Real Time for NFV
Operating systems & Components / Operating system

Vendor Red Hat Inc.

Security Bulletin

This security bulletin contains information about 3 vulnerabilities.

1) Information disclosure

EUVDB-ID: #VU51453

Risk: Low

CVSSv3.1:

CVE-ID: CVE-2021-27363

CWE-ID: CWE-200 - Information Exposure

Exploit availability: No

Description

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

The vulnerability exists due to the show_transport_handle() shows iSCSI transport handle to non-root users. A local user can gain unauthorized access to sensitive information and use it along with another vulnerability, such as #VU51452, to escalate privileges on the system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

kernel-rt (Red Hat package): 3.10.0-229.1.2.rt56.141.2.el7_1 - 3.10.0-1160.21.1.rt56.1158.el7

Red Hat Enterprise Linux for Real Time: 7

Red Hat Enterprise Linux for Real Time for NFV: 7

CPE2.3 External links

http://access.redhat.com/errata/RHSA-2021:1070

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?

2) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU51452

Risk: Low

CVSSv3.1:

CVE-ID: CVE-2021-27364

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

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

The vulnerability exists due to iscsi_if_recv_msg() allows non-root users to connect and send commands to the Linux kernel. A local user can escalate privileges on the system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

kernel-rt (Red Hat package): 3.10.0-229.1.2.rt56.141.2.el7_1 - 3.10.0-1160.21.1.rt56.1158.el7

Red Hat Enterprise Linux for Real Time: 7

Red Hat Enterprise Linux for Real Time for NFV: 7

CPE2.3 External links

http://access.redhat.com/errata/RHSA-2021:1070

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?

3) Buffer overflow

EUVDB-ID: #VU51451

Risk: Low

CVSSv3.1:

CVE-ID: CVE-2021-27365

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

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

The vulnerability exists due to a boundary error when processing Netlink messages in Linux kernel through 5.11.3, as certain iSCSI data structures do not have appropriate length constraints or checks, and can exceed the PAGE_SIZE value. A local unprivileged user can send a Netlink message that is associated with iSCSI, and has a length up to the maximum length of a Netlink message, trigger memory corruption and execute arbitrary code on the system with elevated privileges.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

kernel-rt (Red Hat package): 3.10.0-229.1.2.rt56.141.2.el7_1 - 3.10.0-1160.21.1.rt56.1158.el7

Red Hat Enterprise Linux for Real Time: 7

Red Hat Enterprise Linux for Real Time for NFV: 7

CPE2.3 External links

http://access.redhat.com/errata/RHSA-2021:1070

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?



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