Input validation error in Unbound - CVE-2020-10772

Vulnerability identifier: #VU29959

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-2020-10772

CWE-ID: CWE-20

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due incomplete fix for vulnerability SB2020052127 #1 (CVE-2020-12662). A remote attacker who controls a malicious DNS server can send a specially crafted response and perform a denial of service (DoS) attack against third-party DNS servers.

Unbound
unbound (Red Hat package)
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, big endian
Red Hat Enterprise Linux for Scientific Computing
Red Hat Enterprise Linux for Power, little endian

Install update from vendor's website.

Unbound - update to 1.11.0
unbound (Red Hat package) - update to 1.6.6-5.el7_8

• https://access.redhat.com/errata/RHSA-2020:2642

• Denial of service in Unbound
• Red Hat Enterprise Linux 7 update for unbound