Heap-based buffer overflow in Dnsmasq - CVE-2017-14493

Vulnerability identifier: #VU8662

CSH Severity: Medium

CVSS v4: 8.7 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2017-14493

CWE-ID: CWE-122

Exploitation vector: Adjecent network

Exploit availability: Public exploit is available

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to boundary error when processing DHCPv6 requests. A remote unauthenticated attacker on local network can send specially crafted DHCPv6 request to the affected service, trigger heap-based buffer overflow and crash the service or execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Dnsmasq
Debian Linux
Amazon Linux AMI
Gentoo Linux
Arch Linux
Red Hat Enterprise Linux for Scientific Computing
Red Hat Enterprise Linux for IBM z Systems
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
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 #163 - bof-dnsmasq-cve-2017-14493 (dnsmasq rop exploit with NX bypass) (March 18, 2020)
• Exploit #1335 - Dnsmasq < 2.78 - Stack-Based Overflow (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
• Ubuntu update for Dnsmasq
• OpenSUSE Linux update for dnsmasq
• Red Hat update for dnsmasq
• Red Hat update for dnsmasq
• Heap-based buffer overflow 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