CVE-2018-20024

NameCVE-2018-20024
DescriptionLibVNC before commit 4a21bbd097ef7c44bb000c3bd0907f96a10e4ce7 contains null pointer dereference in VNC client code that can result DoS.
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 severitymedium (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-1.2medium916941
libvncserversourcejessie0.9.9+dfsg2-6.1+deb8u4mediumDLA-1617-1
libvncserversourcestretch0.9.11+dfsg-1.3~deb9u1mediumDSA-4383-1

Notes

https://github.com/LibVNC/libvncserver/issues/254
https://github.com/LibVNC/libvncserver/commit/4a21bbd097ef7c44bb000c3bd0907f96a10e4ce7
https://ics-cert.kaspersky.com/advisories/klcert-advisories/2018/12/19/klcert-18-034-libvnc-null-pointer-dereference/

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