Vulnerability Monitor

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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.

Published

2020-09-27T04:15:11.650

Last Modified

2024-11-21T05:19:16.850

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 8.1 (HIGH)

CVSSv2 Vector

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

Access Vector: NETWORK
Access Complexity: MEDIUM
Authentication: NONE
Confidentiality Impact: PARTIAL
Integrity Impact: PARTIAL
Availability Impact: NONE

Exploitability Score

8.6

Impact Score

4.9

Weaknesses

Type: Primary
CWE-295

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	tigervnc	tigervnc	< 1.11.0	Yes
Operating System	debian	debian_linux	9.0	Yes
Operating System	opensuse	leap	15.2	Yes

References

http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00025.html Broken Link, Mailing List, Third Party Advisory ([email protected])
http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00024.html Broken Link, Mailing List, Third Party Advisory ([email protected])
https://bugzilla.opensuse.org/show_bug.cgi?id=1176733 Issue Tracking, Third Party Advisory ([email protected])
https://github.com/TigerVNC/tigervnc/commit/20dea801e747318525a5859fe4f37c52b05310cb Patch, Third Party Advisory ([email protected])
https://github.com/TigerVNC/tigervnc/commit/7399eab79a4365434d26494fa1628ce1eb91562b Patch, Third Party Advisory ([email protected])
https://github.com/TigerVNC/tigervnc/commit/b30f10c681ec87720cff85d490f67098568a9cba Patch, Third Party Advisory ([email protected])
https://github.com/TigerVNC/tigervnc/commit/f029745f63ac7d22fb91639b2cb5b3ab56134d6e Patch, Third Party Advisory ([email protected])
https://github.com/TigerVNC/tigervnc/releases/tag/v1.11.0 Release Notes, Third Party Advisory ([email protected])
https://lists.debian.org/debian-lts-announce/2020/10/msg00007.html Mailing List, Third Party Advisory ([email protected])
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00025.html Broken Link, Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00024.html Broken Link, Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://bugzilla.opensuse.org/show_bug.cgi?id=1176733 Issue Tracking, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/TigerVNC/tigervnc/commit/20dea801e747318525a5859fe4f37c52b05310cb Patch, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/TigerVNC/tigervnc/commit/7399eab79a4365434d26494fa1628ce1eb91562b Patch, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/TigerVNC/tigervnc/commit/b30f10c681ec87720cff85d490f67098568a9cba Patch, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/TigerVNC/tigervnc/commit/f029745f63ac7d22fb91639b2cb5b3ab56134d6e Patch, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/TigerVNC/tigervnc/releases/tag/v1.11.0 Release Notes, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://lists.debian.org/debian-lts-announce/2020/10/msg00007.html Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)