Vulnerability Details : 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.
Products affected by CVE-2020-26117
- cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
- cpe:2.3:o:opensuse:leap:15.2:*:*:*:*:*:*:*
- cpe:2.3:a:tigervnc:tigervnc:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2020-26117
0.19%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 56 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2020-26117
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
5.8
|
MEDIUM | AV:N/AC:M/Au:N/C:P/I:P/A:N |
8.6
|
4.9
|
NIST | |
|
8.1
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N |
2.8
|
5.2
|
NIST |
CWE ids for CVE-2020-26117
-
The product does not validate, or incorrectly validates, a certificate.Assigned by: nvd@nist.gov (Primary)
References for CVE-2020-26117
-
https://github.com/TigerVNC/tigervnc/commit/f029745f63ac7d22fb91639b2cb5b3ab56134d6e
Properly store certificate exceptions in Java viewer · TigerVNC/tigervnc@f029745 · GitHubPatch;Third Party Advisory
-
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00025.html
[security-announce] openSUSE-SU-2020:1666-1: critical: Security update fBroken Link;Mailing List;Third Party Advisory
-
https://github.com/TigerVNC/tigervnc/commit/20dea801e747318525a5859fe4f37c52b05310cb
Properly store certificate exceptions in Java viewer · TigerVNC/tigervnc@20dea80 · GitHubPatch;Third Party Advisory
-
https://github.com/TigerVNC/tigervnc/commit/7399eab79a4365434d26494fa1628ce1eb91562b
Properly store certificate exceptions · TigerVNC/tigervnc@7399eab · GitHubPatch;Third Party Advisory
-
https://lists.debian.org/debian-lts-announce/2020/10/msg00007.html
[SECURITY] [DLA 2396-1] tigervnc security updateMailing List;Third Party Advisory
-
https://bugzilla.opensuse.org/show_bug.cgi?id=1176733
Bug 1176733 – VUL-0: tigervnc: certificate exceptions stored as authoritiesIssue Tracking;Third Party Advisory
-
http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00024.html
[security-announce] openSUSE-SU-2020:1841-1: critical: Security update fBroken Link;Mailing List;Third Party Advisory
-
https://github.com/TigerVNC/tigervnc/commit/b30f10c681ec87720cff85d490f67098568a9cba
Properly store certificate exceptions · TigerVNC/tigervnc@b30f10c · GitHubPatch;Third Party Advisory
-
https://github.com/TigerVNC/tigervnc/releases/tag/v1.11.0
Release TigerVNC 1.11.0 · TigerVNC/tigervnc · GitHubRelease Notes;Third Party Advisory
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