CVE-2018-20020

NameCVE-2018-20020
DescriptionLibVNC before commit 7b1ef0ffc4815cab9a96c7278394152bdc89dc4d contains heap out-of-bound write vulnerability inside structure in VNC client code that can result remote code execution
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
ReferencesDLA-1617-1, DSA-4383-1
NVD severityhigh (attack range: remote)
Debian Bugs916941

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
libvncserver (PTS)jessie0.9.9+dfsg2-6.1+deb8u3vulnerable
jessie (security)0.9.9+dfsg2-6.1+deb8u5fixed
stretch (security), stretch0.9.11+dfsg-1.3~deb9u1fixed
buster, sid0.9.11+dfsg-1.3fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
libvncserversource(unstable)0.9.11+dfsg-1.2high916941
libvncserversourcejessie0.9.9+dfsg2-6.1+deb8u4highDLA-1617-1
libvncserversourcestretch0.9.11+dfsg-1.3~deb9u1highDSA-4383-1

Notes

https://github.com/LibVNC/libvncserver/issues/250
https://github.com/LibVNC/libvncserver/commit/09f2f3fb6a5a163e453e5c2979054670c39694bc
https://github.com/LibVNC/libvncserver/commit/7b1ef0ffc4815cab9a96c7278394152bdc89dc4d
https://ics-cert.kaspersky.com/advisories/klcert-advisories/2018/12/19/klcert-18-030-libvnc-heap-out-of-bound-write/

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