CVE-2020-26117

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.

CVSS v3 8.1 HIGH
CVSS v2.0 5.8 MEDIUM

8.1^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.8 / Impact : 5.2

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

5.8^/10

CVSS v2.0 : MEDIUM

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

Exploitability : 8.6 / Impact : 4.9

Access Vector NETWORK

Access Complexity MEDIUM

Authentication NONE

Confidentiality Impact PARTIAL

Integrity Impact PARTIAL

Availability Impact NONE

References

Link	Resource
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00025.html	Broken Link Mailing List Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00024.html	Broken Link Mailing List Third Party Advisory
https://bugzilla.opensuse.org/show_bug.cgi?id=1176733	Issue Tracking Third Party Advisory
https://github.com/TigerVNC/tigervnc/commit/20dea801e747318525a5859fe4f37c52b05310cb	Patch Third Party Advisory
https://github.com/TigerVNC/tigervnc/commit/7399eab79a4365434d26494fa1628ce1eb91562b	Patch Third Party Advisory
https://github.com/TigerVNC/tigervnc/commit/b30f10c681ec87720cff85d490f67098568a9cba	Patch Third Party Advisory
https://github.com/TigerVNC/tigervnc/commit/f029745f63ac7d22fb91639b2cb5b3ab56134d6e	Patch Third Party Advisory
https://github.com/TigerVNC/tigervnc/releases/tag/v1.11.0	Release Notes Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/10/msg00007.html	Mailing List Third Party Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:tigervnc:tigervnc:*:*:*:*:*:*:*:*

Configuration 2 (hide)

OR	cpe:2.3:o:debian:debian_linux:9.0:::::::*
	cpe:2.3:o:opensuse:leap:15.2:::::::*

History

No history.

Information

Published : 2020-09-27 04:15

Updated : 2022-11-16 14:13

NVD link : CVE-2020-26117

Mitre link : CVE-2020-26117

CVE.ORG link : CVE-2020-26117

JSON object : View

Products Affected

debian

debian_linux

tigervnc

tigervnc

opensuse

leap

CWE

CWE-295

Improper Certificate Validation

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