Red Hat update for kernel

Published: 2018-11-13 | Updated: 2018-11-21

Risk	Low
Patch available	YES
Number of vulnerabilities	4
CVE-ID	CVE-2017-18344 CVE-2018-5391 CVE-2018-10675 CVE-2018-14634
CWE-ID	CWE-125 CWE-20 CWE-416 CWE-190
Exploitation vector	Network
Public exploit	Public exploit code for vulnerability #1 is available. Public exploit code for vulnerability #4 is available.
Vulnerable software Subscribe	Red Hat Enterprise Linux Server for x86_64 - Update Services for SAP Solutions Operating systems & Components / Operating system package or component kernel (Red Hat package) Operating systems & Components / Operating system package or component Red Hat Enterprise Linux Server - TUS Operating systems & Components / Operating system Red Hat Enterprise Linux Server - AUS Operating systems & Components / Operating system
Vendor	Red Hat Inc.

Security Bulletin

This security bulletin contains information about 4 vulnerabilities.

1) Out-of-bounds read

EUVDB-ID: #VU14184

Risk: Low

CVSSv3.1: 3 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C]

CVE-ID: CVE-2017-18344

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

Exploit availability: Yes

Description

The vulnerability allows a local attacker to obtain potentially sensitive information.

The vulnerability exists due to out-of-bounds memory read error in the 'sigevent->sigev_notify' field of show_timer() function in the timer subsystem. A local attacker can obtain potentially sensitive information from system memory.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Red Hat Enterprise Linux Server for x86_64 - Update Services for SAP Solutions: 7.2

Red Hat Enterprise Linux Server - TUS: 7.2

Red Hat Enterprise Linux Server - AUS: 7.2

kernel (Red Hat package): 3.10.0-123.1.2.el7 - 3.10.0-327.73.1.el7

External links

http://access.redhat.com/errata/RHSA-2018:3590

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.

2) Improper input validation

EUVDB-ID: #VU14437

Risk: Medium

CVSSv3.1: 7.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-5391

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to cause DoS condition on the target system.

The vulnerability exists due to an error when handling reassembly of fragmented IPv4 and IPv6 packets. A remote attacker can send specially crafted packets, trigger time and calculation expensive fragment reassembly algorithms and cause the service to crash.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Red Hat Enterprise Linux Server for x86_64 - Update Services for SAP Solutions: 7.2

Red Hat Enterprise Linux Server - TUS: 7.2

Red Hat Enterprise Linux Server - AUS: 7.2

kernel (Red Hat package): 3.10.0-123.1.2.el7 - 3.10.0-327.73.1.el7

External links

http://access.redhat.com/errata/RHSA-2018:3590

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.

3) Use-after-free error

EUVDB-ID: #VU13023

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-2018-10675

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a local attacker to cause DoS condition on the target system.

The weakness exists in the do_get_mempolicy function in mm/mempolicy.c due to use-after-free error. A local attacker can use specially crafted system calls, trigger memory corruption and cause the service to crash.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Red Hat Enterprise Linux Server for x86_64 - Update Services for SAP Solutions: 7.2

Red Hat Enterprise Linux Server - TUS: 7.2

Red Hat Enterprise Linux Server - AUS: 7.2

kernel (Red Hat package): 3.10.0-123.1.2.el7 - 3.10.0-327.73.1.el7

External links

http://access.redhat.com/errata/RHSA-2018:3590

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) Integer overflow

EUVDB-ID: #VU15168

Risk: Low

CVSSv3.1: 7 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2018-14634

CWE-ID: CWE-190 - Integer overflow

Exploit availability: Yes

Description

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

The vulnerability exists due to integer overflow in create_elf_tables() function when processing SUID binaries. A local unprivileged user can use this vulnerability to execute execute arbitrary code on the system with elevated privileges.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Red Hat Enterprise Linux Server for x86_64 - Update Services for SAP Solutions: 7.2

Red Hat Enterprise Linux Server - TUS: 7.2

Red Hat Enterprise Linux Server - AUS: 7.2

kernel (Red Hat package): 3.10.0-123.1.2.el7 - 3.10.0-327.73.1.el7

External links

http://access.redhat.com/errata/RHSA-2018:3590

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.