CVE-2020-26117

Published: 27 September 2020

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.

Priority

Cvss 3 Severity Score

8.1

Score breakdown

Status

Package	Release	Status
tigervnc Launchpad, Ubuntu, Debian	hirsute	Not vulnerable (1.10.1+dfsg-9)
	focal	Released (1.10.1+dfsg-3ubuntu0.1+esm2) Available with Ubuntu Pro
	kinetic	Not vulnerable (1.10.1+dfsg-9)
	bionic	Needs triage
	groovy	Ignored (end of life)
	impish	Not vulnerable (1.10.1+dfsg-9)
	jammy	Not vulnerable (1.10.1+dfsg-9)
	lunar	Not vulnerable (1.10.1+dfsg-9)
	trusty	Does not exist
	upstream	Released (1.10.1+dfsg-9)
	xenial	Does not exist
	mantic	Not vulnerable (1.10.1+dfsg-9)

Severity score breakdown

Parameter	Value
Base score	8.1
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	Required
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	None
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

References

Bugs

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=971272

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