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, 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, DLA-2045-1, DSA-4383-1
NVD severityhigh
Debian Bugs916941, 945827

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
italc (PTS)jessie1:2.0.2+dfsg1-2vulnerable
jessie (security)1:2.0.2+dfsg1-2+deb8u1fixed
stretch1:3.0.3+dfsg1-1vulnerable
libvncserver (PTS)jessie0.9.9+dfsg2-6.1+deb8u3vulnerable
jessie (security)0.9.9+dfsg2-6.1+deb8u6fixed
stretch (security), stretch0.9.11+dfsg-1.3~deb9u1fixed
buster0.9.11+dfsg-1.3fixed
bullseye, sid0.9.12+dfsg-7fixed
ssvnc (PTS)jessie1.0.29-2vulnerable
jessie (security)1.0.29-2+deb8u1fixed
stretch1.0.29-3vulnerable
buster1.0.29-4vulnerable
bullseye, sid1.0.29-5fixed
tightvnc (PTS)jessie1.3.9-6.5vulnerable
jessie (security)1.3.9-6.5+deb8u1fixed
buster, stretch1:1.3.9-9vulnerable
bullseye, sid1:1.3.9-9.1fixed
veyon (PTS)buster4.1.7+repack1-1fixed
bullseye, sid4.3.1+repack1-1fixed

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
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
tightvncsource(unstable)1:1.3.9-9.1
tightvncsourcejessie1.3.9-6.5+deb8u1DLA-2045-1
veyonsource(unstable)4.1.4+repack1-1

Notes

[buster] - tightvnc <no-dsa> (Minor issue; will be fixed via point release)
[stretch] - tightvnc <no-dsa> (Minor issue; will be fixed via point release)
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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