Home/CVE/In rfb/CSecurityTLS.cxx and rfb/CSecurityTLS.java in TigerVNC before 1.11.0, viewers mishandle TLS certificate exception
CVE

CVE-2020-26117

In rfb/CSecurityTLS.cxx and rfb/CSecurityTLS.java in TigerVNC before 1.11.0, viewers mishandle TLS certificate exception

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.

HIGH · CVSS 8.1 EPSS 0.0069
Schedule remediation
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-295Improper Certificate Validation
▤

Affected Products & Versions

3
tigervnc< 1.11.0
debian linuxall versions
opensuse leapall versions
▣

Scoring & Timeline

8.1
HIGH · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD27 Sep 2020 · 04:15 AM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
⚑

Vendor Advisories

9
suse-csafopenSUSE-SU-2024:10591-1
usnUSN-5965-1
suse-csafopenSUSE-SU-2020:1841-1
suse-csafopenSUSE-SU-2020:1666-1
suse-csafSUSE-SU-2020:2898-1
🔗

References & Sources

9
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00025.htmlBroken LinkMailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00024.htmlBroken LinkMailing ListThird Party Advisory
https://bugzilla.opensuse.org/show_bug.cgi?id=1176733Issue TrackingThird Party Advisory
https://github.com/TigerVNC/tigervnc/commit/20dea801e747318525a5859fe4f37c52b05310cbPatchThird Party Advisory
https://github.com/TigerVNC/tigervnc/commit/7399eab79a4365434d26494fa1628ce1eb91562bPatchThird Party Advisory
https://github.com/TigerVNC/tigervnc/commit/b30f10c681ec87720cff85d490f67098568a9cbaPatchThird Party Advisory
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