CVE-2020-26117
First published: Sun Sep 27 2020(Updated: )
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.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| TigerVNC | <1.11.0 | |
| Debian GNU/Linux | =9.0 | |
| openSUSE | =15.2 |
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Reference Links
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00025.html
- http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00024.html
- https://bugzilla.opensuse.org/show_bug.cgi?id=1176733
- https://github.com/TigerVNC/tigervnc/commit/20dea801e747318525a5859fe4f37c52b05310cb
- https://github.com/TigerVNC/tigervnc/commit/7399eab79a4365434d26494fa1628ce1eb91562b
- https://github.com/TigerVNC/tigervnc/commit/b30f10c681ec87720cff85d490f67098568a9cba
- https://github.com/TigerVNC/tigervnc/commit/f029745f63ac7d22fb91639b2cb5b3ab56134d6e
- https://github.com/TigerVNC/tigervnc/releases/tag/v1.11.0
- https://lists.debian.org/debian-lts-announce/2020/10/msg00007.html
Frequently Asked Questions
What is the severity of CVE-2020-26117?
CVE-2020-26117 is considered a high-severity vulnerability due to the potential for certificate impersonation.
How do I fix CVE-2020-26117?
To mitigate CVE-2020-26117, upgrade TigerVNC to version 1.11.0 or later.
What versions of TigerVNC are affected by CVE-2020-26117?
TigerVNC versions prior to 1.11.0 are affected by CVE-2020-26117.
Which operating systems are impacted by CVE-2020-26117?
CVE-2020-26117 affects TigerVNC on various platforms, including Debian 9.0 and openSUSE Leap 15.2.
What are the implications of CVE-2020-26117 for users?
Users may be at risk of man-in-the-middle attacks, as the vulnerability allows attackers to impersonate servers.
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