An exploitable denial-of-service vulnerability exists in the message-parsing functionality of Videolabs libmicrodns 0.1.0. When parsing mDNS messages in mdns_recv, the return value of the mdns_read_header function is not checked, leading to an uninitialized variable usage that eventually results in a null pointer dereference, leading to service crash. An attacker can send a series of mDNS messages to trigger this vulnerability.
Weakness
The product does not check the return value from a method or function, which can prevent it from detecting unexpected states and conditions.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Libmicrodns | Videolabs | 0.1.0 (including) | 0.1.0 (including) |
| Libmicrodns | Ubuntu | bionic | * |
| Libmicrodns | Ubuntu | eoan | * |
| Libmicrodns | Ubuntu | esm-apps/bionic | * |
| Libmicrodns | Ubuntu | trusty | * |
| Libmicrodns | Ubuntu | upstream | * |
| Vlc | Ubuntu | bionic | * |
| Vlc | Ubuntu | esm-apps/bionic | * |
| Vlc | Ubuntu | groovy | * |
| Vlc | Ubuntu | hirsute | * |
| Vlc | Ubuntu | impish | * |
| Vlc | Ubuntu | kinetic | * |
| Vlc | Ubuntu | lunar | * |
| Vlc | Ubuntu | mantic | * |
| Vlc | Ubuntu | trusty | * |
| Vlc | Ubuntu | xenial | * |
Potential Mitigations
References
- https://security.gentoo.org/glsa/202005-10
- https://talosintelligence.com/vulnerability_reports/TALOS-2020-1001
- https://www.debian.org/security/2020/dsa-4671
- https://security.gentoo.org/glsa/202005-10
- https://talosintelligence.com/vulnerability_reports/TALOS-2020-1001
- https://www.debian.org/security/2020/dsa-4671