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, DLA-1979-1, DLA-2016-1, DSA-4383-1
NVD severitymedium
Debian Bugs916941, 945827

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
italc (PTS)stretch1:3.0.3+dfsg1-1+deb9u1fixed
libvncserver (PTS)stretch0.9.11+dfsg-1.3~deb9u3fixed
stretch (security)0.9.11+dfsg-1.3~deb9u1fixed
buster0.9.11+dfsg-1.3+deb10u3fixed
bullseye, sid0.9.13+dfsg-1fixed
ssvnc (PTS)stretch1.0.29-3vulnerable
buster1.0.29-4vulnerable
bullseye, sid1.0.29-5fixed
veyon (PTS)buster4.1.7+repack1-1fixed
bullseye, sid4.3.1+repack1-2fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
italcsource(unstable)(unfixed)
italcsourcejessie1:2.0.2+dfsg1-2+deb8u1DLA-1979-1
italcsourcestretch1:3.0.3+dfsg1-1+deb9u1
libvncserversource(unstable)0.9.11+dfsg-1.2916941
libvncserversourcejessie0.9.9+dfsg2-6.1+deb8u4DLA-1617-1
libvncserversourcestretch0.9.11+dfsg-1.3~deb9u1DSA-4383-1
ssvncsource(unstable)1.0.29-5945827
ssvncsourcejessie1.0.29-2+deb8u1DLA-2016-1
veyonsource(unstable)4.1.4+repack1-1

Notes

[buster] - ssvnc <no-dsa> (Minor issue)
[stretch] - ssvnc <no-dsa> (Minor issue)
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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