#VU33042 Missing Authentication for Critical Function - CVE-2018-16758

Vulnerability identifier: #VU33042

Vulnerability risk: Medium

CVSSv4.0: 4.6 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2018-16758

CWE-ID: CWE-306

Exploitation vector: Network

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to gain access to sensitive information.

Missing message authentication in the meta-protocol in Tinc VPN version 1.0.34 and earlier allows a man-in-the-middle attack to disable the encryption of VPN packets.

Mitigation
Install update from vendor's website.

External links
https://tinc-vpn.org/security/
https://www.tinc-vpn.org/git/browse?p=tinc;a=commit;h=e97943b7cc9c851ae36f5a41e2b6102faa74193f
https://www.debian.org/security/2018/dsa-4312

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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.