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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:Sep 18, 2020
    Last Modified:Nov 21, 2024
    EPS:Sep 27, 2020
    EPSS Score:0.00935
    CVSS Score:8.1

    Affected Products

    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Opensuse
    Product
    Leap
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Tigervnc
    Product
    Tigervnc

    Exploits

    No exploit reference

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    References

    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
    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

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High