Memory exhaustion in Dnsmasq - CVE-2017-14495

Vulnerability identifier: #VU8664

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-2017-14495

CWE-ID: CWE-400

Exploitation vector: Remote access

Exploit availability: Public exploit is available

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

The vulnerability exists due to incorrect memory allocation (memory is never freed) in  add_pseudoheader() function when processing DNS queries. A remote unauthenticated attacker can send a specially crafted DNS request to the affected service and cause dnsmasq to consume all available memory.

Successful exploitation of this vulnerability may allow an attacker to perform a denial of service (DoS) attack, but requires that dnsmasq is compiled with --add-mac, --add-cpe-id or --add-subnet option.

Dnsmasq
Debian Linux
Arch Linux
Amazon Linux AMI
Gentoo Linux
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Scientific Computing
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux EUS Compute Node
SUSE Linux
Ubuntu
Slackware Linux
Fedora
SCALANCE S615
SCALANCE M800
SCALANCE W1750D
dnsmasq (Alpine package)
dnsmasq
Edgeline EL300 Converged Edge System

Update to version 2.78.

dnsmasq (Alpine package) - addressed in versions 2.76-r1, 2.76-r2
Edgeline EL300 Converged Edge System - update to 1.50
dnsmasq - addressed in versions 2.76-4.fc25, 2.76-5.fc26, 2.77-9.fc27

• Exploit #1337 - Dnsmasq < 2.78 - Lack of free() Denial of Service (March 18, 2020)

• http://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2017q4/011771.html
• https://security.googleblog.com/2017/10/behind-masq-yet-more-dns-and-dhcp.html

• Multiple vulnerabilities in GNU Dnsmasq
• Debian update for dnsmasq
• Ubuntu update for Dnsmasq
• Ubuntu update for Dnsmasq
• Arch Linux update for dnsmasq
• Slackware Linux update for dnsmasq
• Gentoo update for Dnsmasq
• Amazon Linux AMI update for dnsmasq
• Multiple vulnerabilities in Siemens SCALANCE W1750D, M800 and S615
• Ubuntu update for Dnsmasq
• OpenSUSE Linux update for dnsmasq
• Red Hat update for dnsmasq
• Memory exhaustion in dnsmasq (Alpine package)
• SUSE Linux update for dnsmasq
• SUSE Linux update for dnsmasq
• SUSE Linux update for dnsmasq
• Multiple vulnerabilities in HPE Edgeline EL300 Converged Edge System
• Fedora 27 update for dnsmasq
• Fedora 26 update for dnsmasq
• Fedora 25 update for dnsmasq