#VU12873 Improper input validation in OpenBSD


Published: 2018-05-21

Vulnerability identifier: #VU12873

Vulnerability risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/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 incorrect checks in libcrypto. A remote attacker can submit a specially crafted input and prevent Diffie-Hellman Exchange operations from working.

Mitigation
Update to version 6.3.

Vulnerable software versions

OpenBSD: 5.7 - 6.2


External links
http://ftp.openbsd.org/pub/OpenBSD/patches/6.3/common/007_libcrypto.patch.sig


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.


Latest bulletins with this vulnerability