CVE-2020-26117

high

Description

In rfb/CSecurityTLS.cxx and rfb/CSecurityTLS.java in TigerVNC before 1.11.0, viewers mishandle TLS certificate exceptions. They store the certificates as authorities, meaning that the owner of a certificate could impersonate any server after a client had added an exception.

References

https://lists.debian.org/debian-lts-announce/2020/10/msg00007.html

https://github.com/TigerVNC/tigervnc/releases/tag/v1.11.0

https://github.com/TigerVNC/tigervnc/commit/f029745f63ac7d22fb91639b2cb5b3ab56134d6e

https://github.com/TigerVNC/tigervnc/commit/b30f10c681ec87720cff85d490f67098568a9cba

https://github.com/TigerVNC/tigervnc/commit/7399eab79a4365434d26494fa1628ce1eb91562b

https://github.com/TigerVNC/tigervnc/commit/20dea801e747318525a5859fe4f37c52b05310cb

https://bugzilla.opensuse.org/show_bug.cgi?id=1176733

http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00024.html

http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00025.html

Details

Source: Mitre, NVD

Published: 2020-09-27

Updated: 2022-11-16

Risk Information

CVSS v2

Base Score: 5.8

Vector: CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:N

Severity: Medium

CVSS v3

Base Score: 8.1

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

Severity: High