Vulnerability identifier: #VU7204

Vulnerability 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: N/A

CWE-ID: CWE-119

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
OpenBSD
Operating systems & Components / Operating system

Vendor: OpenBSD

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

The weakness exists due to memory free error in wsmux_getmux(). A local attacker can trigger memory corruption and cause the kernel to crash.

Successful exploitation of the vulnerability results in denial of service.

Mitigation
Install update from vendor's website.

Vulnerable software versions

OpenBSD: 6.1

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External links
http://ftp.openbsd.org/pub/OpenBSD/patches/6.1/common/011_sti.patch.sig
http://ftp.openbsd.org/pub/OpenBSD/patches/6.1/common/012_wsmux.patch.sig

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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.