Uncontrolled Recursion in libmicrodns - CVE-2020-6071
Published: March 24, 2020
Vulnerability identifier: #VU26342
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2020-6071
CWE-ID: CWE-674
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to the compression pointer is followed without checking for recursion in the resource record-parsing functionality when parsing compressed labels in mDNS messages. A remote attacker can send a specially crafted mDNS message and cause a denial of service condition on the target system.
Affected software
libmicrodns
Arch Linux
Gentoo Linux
Ubuntu
vlc (Debian package)
vlc (Alpine package)
libmicrodns0 (Ubuntu package)
VLC Media Player
Arch Linux
Gentoo Linux
Ubuntu
vlc (Debian package)
vlc (Alpine package)
libmicrodns0 (Ubuntu package)
VLC Media Player
How to mitigate CVE-2020-6071
Install updates from vendor's website.
libmicrodns - update to 0.1.1
vlc (Debian package) - update to 3.0.10-0+deb9u1
VLC Media Player - update to 3.0.9.2
vlc (Alpine package) - update to 3.0.9.2-r0
libmicrodns0 (Ubuntu package) - update to Ubuntu Pro
vlc (Debian package) - update to 3.0.10-0+deb9u1
VLC Media Player - update to 3.0.9.2
vlc (Alpine package) - update to 3.0.9.2-r0
libmicrodns0 (Ubuntu package) - update to Ubuntu Pro