CVE-2020-26117

high
New! CVE Severity Now Using CVSS v3

The calculated severity for CVEs has been updated to use CVSS v3 by default. CVEs that do not have a CVSS v3 score will fall back CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.

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

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

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

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

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

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

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

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

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

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

Details

Source: MITRE

Published: 2020-09-27

Updated: 2020-11-06

Type: CWE-295

Risk Information

CVSS v2

Base Score: 5.8

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

Impact Score: 4.9

Exploitability Score: 8.6

Severity: MEDIUM

CVSS v3

Base Score: 8.1

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

Impact Score: 5.2

Exploitability Score: 2.8

Severity: HIGH

Tenable Plugins

View all (16 total)

IDNameProductFamilySeverity
149917Oracle Linux 8 : tigervnc (ELSA-2021-1783)NessusOracle Linux Local Security Checks
high
149753CentOS 8 : tigervnc (CESA-2021:1783)NessusCentOS Local Security Checks
high
149674RHEL 8 : tigervnc (RHSA-2021:1783)NessusRed Hat Local Security Checks
high
146755EulerOS 2.0 SP2 : tigervnc (EulerOS-SA-2021-1369)NessusHuawei Local Security Checks
high
146169EulerOS 2.0 SP5 : tigervnc (EulerOS-SA-2021-1237)NessusHuawei Local Security Checks
high
145143EulerOS 2.0 SP3 : tigervnc (EulerOS-SA-2021-1127)NessusHuawei Local Security Checks
high
144149EulerOS 2.0 SP8 : tigervnc (EulerOS-SA-2020-2536)NessusHuawei Local Security Checks
high
143839SUSE SLES12 Security Update : tigervnc (SUSE-SU-2020:2898-1)NessusSuSE Local Security Checks
high
143679SUSE SLES12 Security Update : tigervnc (SUSE-SU-2020:2881-1)NessusSuSE Local Security Checks
high
143652SUSE SLES15 Security Update : tigervnc (SUSE-SU-2020:2882-1)NessusSuSE Local Security Checks
high
143643SUSE SLED15 / SLES15 Security Update : tigervnc (SUSE-SU-2020:2880-1)NessusSuSE Local Security Checks
high
142537openSUSE Security Update : tigervnc (openSUSE-2020-1841)NessusSuSE Local Security Checks
high
142274EulerOS 2.0 SP9 : tigervnc (EulerOS-SA-2020-2422)NessusHuawei Local Security Checks
high
142230EulerOS 2.0 SP9 : tigervnc (EulerOS-SA-2020-2440)NessusHuawei Local Security Checks
high
141462openSUSE Security Update : tigervnc (openSUSE-2020-1666)NessusSuSE Local Security Checks
high
141246Debian DLA-2396-1 : tigervnc security updateNessusDebian Local Security Checks
high