| Name | CVE-2018-20023 |
| Description | LibVNC before 8b06f835e259652b0ff026898014fc7297ade858 contains CWE-665: Improper Initialization vulnerability in VNC Repeater client code that allows attacker to read stack memory and can be abuse for information disclosure. Combined with another vulnerability, it can be used to leak stack memory layout and in bypassing ASLR |
| 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, DSA-4383-1 |
| Debian Bugs | 916941 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| libvncserver (PTS) | bullseye | 0.9.13+dfsg-2+deb11u1 | fixed |
| bookworm, sid, trixie | 0.9.14+dfsg-1 | fixed | |
| veyon (PTS) | 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 | 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 | 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 | ||
| veyon | source | (unstable) | 4.1.4+repack1-1 |
https://github.com/LibVNC/libvncserver/issues/253
https://github.com/LibVNC/libvncserver/commit/8b06f835e259652b0ff026898014fc7297ade858
https://ics-cert.kaspersky.com/advisories/klcert-advisories/2018/12/19/klcert-18-033-libvnc-memory-leak/