CVE-2018-20021

NameCVE-2018-20021
DescriptionLibVNC before commit c3115350eb8bb635d0fdb4dbbb0d0541f38ed19c contains a CWE-835: Infinite loop vulnerability in VNC client code. Vulnerability allows attacker to consume excessive amount of resources like CPU and RAM
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
ReferencesDLA-1617-1, DLA-1979-1, DLA-2016-1, DLA-2045-1, DSA-4383-1
Debian Bugs916941, 945827

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
italc (PTS)jessie, jessie (lts)1:2.0.2+dfsg1-2+deb8u1fixed
stretch1:3.0.3+dfsg1-1+deb9u1fixed
libvncserver (PTS)jessie, jessie (lts)0.9.9+dfsg2-6.1+deb8u8fixed
stretch (security)0.9.11+dfsg-1.3~deb9u6fixed
stretch (lts), stretch0.9.11+dfsg-1.3~deb9u7fixed
buster0.9.11+dfsg-1.3+deb10u4fixed
buster (security)0.9.11+dfsg-1.3+deb10u5fixed
bullseye0.9.13+dfsg-2+deb11u1fixed
sid, trixie, bookworm0.9.14+dfsg-1fixed
ssvnc (PTS)jessie, jessie (lts)1.0.29-2+deb8u1fixed
stretch1.0.29-3+deb9u1fixed
buster1.0.29-4+deb10u1fixed
bullseye1.0.29-5fixed
sid, trixie, bookworm1.0.29-6fixed
tightvnc (PTS)jessie, jessie (lts)1.3.9-6.5+deb8u1fixed
stretch1:1.3.9-9+deb9u1fixed
buster1:1.3.9-9+deb10u1fixed
bullseye1:1.3.10-3fixed
sid, trixie, bookworm1:1.3.10-7fixed
veyon (PTS)buster4.1.7+repack1-1fixed
bullseye4.5.3+repack1-1fixed
sid, trixie, bookworm4.7.5+repack1-1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
italcsourcewheezy(unfixed)end-of-life
italcsourcejessie1:2.0.2+dfsg1-2+deb8u1DLA-1979-1
italcsourcestretch1:3.0.3+dfsg1-1+deb9u1
italcsource(unstable)(unfixed)
libvncserversourcewheezy(unfixed)end-of-life
libvncserversourcejessie0.9.9+dfsg2-6.1+deb8u4DLA-1617-1
libvncserversourcestretch0.9.11+dfsg-1.3~deb9u1DSA-4383-1
libvncserversource(unstable)0.9.11+dfsg-1.2916941
ssvncsourcewheezy(unfixed)end-of-life
ssvncsourcejessie1.0.29-2+deb8u1DLA-2016-1
ssvncsourcestretch1.0.29-3+deb9u1
ssvncsourcebuster1.0.29-4+deb10u1
ssvncsource(unstable)1.0.29-5945827
tightvncsourcewheezy(unfixed)end-of-life
tightvncsourcejessie1.3.9-6.5+deb8u1DLA-2045-1
tightvncsourcestretch1:1.3.9-9+deb9u1
tightvncsourcebuster1:1.3.9-9deb10u1
tightvncsource(unstable)1:1.3.9-9.1
veyonsource(unstable)4.1.4+repack1-1

Notes

https://github.com/LibVNC/libvncserver/issues/251
https://github.com/LibVNC/libvncserver/commit/c3115350eb8bb635d0fdb4dbbb0d0541f38ed19c
https://ics-cert.kaspersky.com/advisories/klcert-advisories/2018/12/19/klcert-18-031-libvnc-infinite-loop/

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