Out-of-bounds read in Dnsmasq - CVE-2019-14513

Vulnerability identifier: #VU19919

CSH Severity: Medium

CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N]

CVE-ID: CVE-2019-14513

CWE-ID: CWE-125

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to gain access to sensitive information.

The vulnerability exists due to a boundary error when processing DNS packets. The vulnerability allows an attacker controlled DNS server to send large DNS packets that result in a read operation beyond the buffer allocated for the packet.

Successful exploitation of this vulnerability may result in sensitive data disclosure or denial of service conditions.

Dnsmasq
dnsmasq (Red Hat package)
Red Hat Enterprise Linux Server for x86_64 - Update Services for SAP Solutions
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
dnsmasq (Ubuntu package)
dnsmasq-base (Ubuntu package)
dnsmasq-utils (Ubuntu package)
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for Power, big endian
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux for Scientific Computing
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, big endian - Extended Update Support
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux EUS Compute Node
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat Enterprise Linux Server - TUS
Ubuntu

Install update from vendor's website.

Dnsmasq - update to 2.76
dnsmasq (Red Hat package) - update to 2.76-2.el7
dnsmasq (Ubuntu package) - update to 2.75-1ubuntu0.16.04.10
dnsmasq-base (Ubuntu package) - update to 2.75-1ubuntu0.16.04.10
dnsmasq-utils (Ubuntu package) - update to 2.75-1ubuntu0.16.04.10

• https://github.com/Slovejoy/dnsmasq-pre2.76

• Buffer overflow in Dnsmasq
• Red Hat Enterprise Linux 7 update for dnsmasq
• Ubuntu update for dnsmasq