Memory corruption in Dnsmasq - CVE-2017-14496

Vulnerability identifier: #VU8665

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-2017-14496

CWE-ID: CWE-119

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 boundary error in  add_pseudoheader() function when processing DNS queries. A remote unauthenticated attacker can send a specially crafted DNS request to the affected service, cause dnsmasq to call memcpy with negative size and crash.

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 #1338 - Dnsmasq < 2.78 - Integer Underflow (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 corruption 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