| Name | CVE-2018-20021 |
| Description | LibVNC 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 |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DLA-1617-1, DLA-1979-1, DLA-2016-1, DLA-2045-1, DSA-4383-1 |
| Debian Bugs | 916941, 945827 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| italc (PTS) | jessie, jessie (lts) | 1:2.0.2+dfsg1-2+deb8u1 | fixed |
| stretch | 1:3.0.3+dfsg1-1+deb9u1 | fixed | |
| libvncserver (PTS) | jessie, jessie (lts) | 0.9.9+dfsg2-6.1+deb8u8 | fixed |
| stretch (security) | 0.9.11+dfsg-1.3~deb9u6 | fixed | |
| stretch (lts), stretch | 0.9.11+dfsg-1.3~deb9u7 | fixed | |
| buster (security), buster, buster (lts) | 0.9.11+dfsg-1.3+deb10u5 | fixed | |
| bullseye | 0.9.13+dfsg-2+deb11u1 | fixed | |
| sid, trixie, bookworm | 0.9.14+dfsg-1 | fixed | |
| ssvnc (PTS) | jessie, jessie (lts) | 1.0.29-2+deb8u1 | fixed |
| stretch | 1.0.29-3+deb9u1 | fixed | |
| buster | 1.0.29-4+deb10u1 | fixed | |
| bullseye | 1.0.29-5 | fixed | |
| bookworm | 1.0.29-6 | fixed | |
| sid, trixie | 1.0.29-6.1 | fixed | |
| tightvnc (PTS) | jessie, jessie (lts) | 1.3.9-6.5+deb8u1 | fixed |
| stretch | 1:1.3.9-9+deb9u1 | fixed | |
| buster | 1:1.3.9-9+deb10u1 | fixed | |
| bullseye | 1:1.3.10-3 | fixed | |
| bookworm | 1:1.3.10-7 | fixed | |
| sid, trixie | 1:1.3.10-9 | fixed | |
| veyon (PTS) | buster | 4.1.7+repack1-1 | fixed |
| bullseye | 4.5.3+repack1-1 | fixed | |
| bookworm | 4.7.5+repack1-1 | fixed | |
| sid, trixie | 4.7.5+repack1-1.2 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| italc | source | wheezy | (unfixed) | end-of-life | ||
| italc | source | jessie | 1:2.0.2+dfsg1-2+deb8u1 | DLA-1979-1 | ||
| italc | source | stretch | 1:3.0.3+dfsg1-1+deb9u1 | |||
| italc | source | (unstable) | (unfixed) | |||
| libvncserver | source | wheezy | (unfixed) | end-of-life | ||
| libvncserver | source | jessie | 0.9.9+dfsg2-6.1+deb8u4 | DLA-1617-1 | ||
| libvncserver | source | stretch | 0.9.11+dfsg-1.3~deb9u1 | DSA-4383-1 | ||
| libvncserver | source | (unstable) | 0.9.11+dfsg-1.2 | 916941 | ||
| ssvnc | source | wheezy | (unfixed) | end-of-life | ||
| ssvnc | source | jessie | 1.0.29-2+deb8u1 | DLA-2016-1 | ||
| ssvnc | source | stretch | 1.0.29-3+deb9u1 | |||
| ssvnc | source | buster | 1.0.29-4+deb10u1 | |||
| ssvnc | source | (unstable) | 1.0.29-5 | 945827 | ||
| tightvnc | source | wheezy | (unfixed) | end-of-life | ||
| tightvnc | source | jessie | 1.3.9-6.5+deb8u1 | DLA-2045-1 | ||
| tightvnc | source | stretch | 1:1.3.9-9+deb9u1 | |||
| tightvnc | source | buster | 1:1.3.9-9deb10u1 | |||
| tightvnc | source | (unstable) | 1:1.3.9-9.1 | |||
| veyon | source | (unstable) | 4.1.4+repack1-1 |
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/