Description
An exploitable code execution vulnerability exists in the label-parsing functionality of Videolabs libmicrodns 0.1.0. When parsing compressed labels in mDNS messages, the rr_decode function's return value is not checked, leading to a double free that could be exploited to execute arbitrary code. An attacker can send an mDNS message to trigger this vulnerability.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | Videolabs | Videolabs libmircodns 0.1.0 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | libmicrodns | 0.2.0-1 | — |
| Debian 14 | vlc | 3.0.8-4 | — |
| Debian 13 | libmicrodns | 0.2.0-1 | — |
| Debian 13 | vlc | 3.0.8-4 | — |
| Debian 12 | vlc | 3.0.8-4 | — |
| Debian 10 | vlc | 3.0.10-0+deb10u1 | DSA-4671-1 |
| Debian 9 | vlc | 3.0.10-0+deb9u1 | DSA-4671-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 18.04 LTS | libmicrodns | 0.0.8-1ubuntu0.1~esm1 | USN-7239-1 |
| Ubuntu Pro 18.04 LTS | vlc | 3.0.8-0ubuntu18.04.1+esm3 | — |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | vlc | 3.0.9.2-r0 | — |
| Alpine v3.23 | vlc | 3.0.9.2-r0 | — |
| Alpine v3.22 | vlc | 3.0.9.2-r0 | — |
| Alpine v3.21 | vlc | 3.0.9.2-r0 | — |
| Alpine v3.20 | vlc | 3.0.9.2-r0 | — |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | vlc | 3.0.9.2-r0 | — |
| Alpine v3.18 | vlc | 3.0.9.2-r0 | — |
| Alpine v3.17 | vlc | 3.0.9.2-r0 | — |
| Alpine v3.16 | vlc | 3.0.9.2-r0 | — |
| Alpine v3.15 | vlc | 3.0.9.2-r0 | — |
| Alpine v3.14 | vlc | 3.0.9.2-r0 | — |
| Alpine v3.13 | vlc | 3.0.9.2-r0 | — |
| Alpine v3.12 | vlc | 3.0.9.2-r0 | — |
| Alpine v3.11 | vlc | 3.0.9.2-r0 | — |
Advisories 3
- USN-7239-1 libmicrodns vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-4671-1 vlc - security update Debian Security (DSA / DLA) · Mar 9, 2026
- WID-SEC-2023-1517 VLC: mehrere Schwachstellen BSI CERT-Bund (WID) · Jan 28, 2025
References
- DSA-4671 vendor-advisory
- GLSA-202005-10 vendor-advisory
- https://talosintelligence.com/vulnerability_reports/TALOS-2020-0995