Vulnerability identifier: #VU10424

Vulnerability 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: N/A

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
OpenBSD
Operating systems & Components / Operating system

Vendor: OpenBSD

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

The weakness exists due to improper input validation. A remote attacker can supply specially crafted IPsec AH packets with IP options or IPv6 extension and cause the kernel to crash or hang.

Mitigation
Install update from vendor's website.

Vulnerable software versions

OpenBSD: 6.1 - 6.2

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External links
http://www.openbsd.org/errata61.html
http://www.openbsd.org/errata62.html
http://ftp.openbsd.org/pub/OpenBSD/patches/6.1/common/034_ahopts.patch.sig

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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.