Denial of service vulnerabilities in OpenBSD

Published: 2018-08-30

Risk	Low
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2018-14775
CWE-ID	CWE-284 CWE-20
Exploitation vector	Local
Public exploit	N/A
Vulnerable software Subscribe	OpenBSD Operating systems & Components / Operating system
Vendor	OpenBSD

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Improper access control

EUVDB-ID: #VU14560

Risk: Low

CVSSv3.1: 4.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-14775

CWE-ID: CWE-284 - Improper Access Control

Exploit availability: No

Description

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

The vulnerability exists due to access control flaw in tss_alloc() in 'sys/arch/i386/i386/gdt.c'. A local attacker can run a specially crafted application and cause the system to crash.

Mitigation

Install update from vendor's website.

Vulnerable software versions

OpenBSD: 6.2 - 6.3

External links

http://ftp.openbsd.org/pub/OpenBSD/patches/6.2/common/020_ioport.patch.sig
http://ftp.openbsd.org/pub/OpenBSD/patches/6.3/common/015_ioport.patch.sig

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) Improper input validation

EUVDB-ID: #VU14561