Missing Authentication for Critical Function in tinc (Alpine package)

1) Missing Authentication for Critical Function

EUVDB-ID: #VU33042

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 - Missing Authentication for Critical Function

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.

Vulnerable software versions

tinc (Alpine package): 1.0.31-r1 - 1.0.34-r0

CPE2.3

• cpe:2.3:a:alpine:tinc_alpine_package:1.0.31-r1:*:*:*:*:alpine_linux:*:3.5
• cpe:2.3:a:alpine:tinc_alpine_package:1.0.32-r2:*:*:*:*:alpine_linux:*:3.6
• cpe:2.3:a:alpine:tinc_alpine_package:1.0.33-r0:*:*:*:*:alpine_linux:*:3.7

External links

https://git.alpinelinux.org/aports/commit/?id=a81e84b56a240e3ca575ba9d0aca7f3fedb518d0
https://git.alpinelinux.org/aports/commit/?id=4bae97cf753480617c190b18324ad04d705294b6
https://git.alpinelinux.org/aports/commit/?id=4d5a8dd7fdeb7671773360ec78521fd9557ababf
https://git.alpinelinux.org/aports/commit/?id=28150adaf85ebb64ea4668c5fa3e5658e46058e7

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.