CONFERENCE On Demand: Cyber AI & Automation Summit - Watch Now
Connect with us

Hi, what are you looking for?


Network Security

Google Finds Flaws in Dnsmasq Network Services Tool

Google employees have identified a total of seven vulnerabilities, including ones that allow remote code execution, in the Dnsmasq network services software.

Google employees have identified a total of seven vulnerabilities, including ones that allow remote code execution, in the Dnsmasq network services software.

Written and maintained by Simon Kelley, Dnsmasq is a lightweight tool designed to provide DNS, DHCP, router advertisement and network boot services for small networks. Dnsmasq is used by Linux distributions, routers, smartphones and many Internet of Things (IoT) devices. A scan for “Dnsmasq” using the Internet search engine Shodan reveals over 1.1 million instances worldwide.

An analysis of Dnsmasq conducted by Google’s security team revealed seven issues, including remote code execution, information disclosure, and denial-of-service (DoS) flaws that can be exploited via DNS or DHCP.

One of the most interesting vulnerabilities found by Google researchers is CVE-2017-14491, a DNS-based remote code execution weakness that affects both directly exposed and internal networks.

Another noteworthy remote code execution bug is CVE-2017-14493, a DHCP-based issue caused by a stack buffer overflow. Experts noted that this flaw can be combined with a Dnsmasq information disclosure bug tracked as CVE-2017-14494 to bypass ASLR and execute arbitrary code.

One security hole that affects Android is CVE-2017-14496, a DoS issue that can be exploited by a local attacker or one who is tethered directly to the device. However, Google pointed out that the risk is low considering that the affected service is sandboxed.

The other vulnerabilities are CVE-2017-14492, a DHCP-based heap overflow that leads to RCE; and CVE-2017-14495 and CVE-2017-13704, both of which allow DoS attacks via DNS.

The Google Security Team has released proof-of-concept (PoC) code for each of the vulnerabilities.

Advertisement. Scroll to continue reading.

The flaws have been addressed on Monday with the release of Dnsmasq 2.78. Google has also updated its affected services and provided the fixes to Android partners. This month’s Android security updates will also include the patches.

Related: Google Patches Critical Vulnerabilities in Android

Related: Google Resolves Critical Vulnerabilities in Android’s Media Framework

Related: Google Researchers Find “Worst” Windows RCE Flaw

Related: Google Researcher Details Linux Kernel Exploit

Written By

Eduard Kovacs (@EduardKovacs) is a managing editor at SecurityWeek. He worked as a high school IT teacher for two years before starting a career in journalism as Softpedia’s security news reporter. Eduard holds a bachelor’s degree in industrial informatics and a master’s degree in computer techniques applied in electrical engineering.

Click to comment

Daily Briefing Newsletter

Subscribe to the SecurityWeek Email Briefing to stay informed on the latest threats, trends, and technology, along with insightful columns from industry experts.

Join us as we delve into the transformative potential of AI, predictive ChatGPT-like tools and automation to detect and defend against cyberattacks.


As cybersecurity breaches and incidents escalate, the cyber insurance ecosystem is undergoing rapid and transformational change.


Expert Insights

Related Content

Application Security

Cycode, a startup that provides solutions for protecting software source code, emerged from stealth mode on Tuesday with $4.6 million in seed funding.


Less than a week after announcing that it would suspended service indefinitely due to a conflict with an (at the time) unnamed security researcher...

Identity & Access

Zero trust is not a replacement for identity and access management (IAM), but is the extension of IAM principles from people to everyone and...

Data Breaches

OpenAI has confirmed a ChatGPT data breach on the same day a security firm reported seeing the use of a component affected by an...

Risk Management

The supply chain threat is directly linked to attack surface management, but the supply chain must be known and understood before it can be...

IoT Security

A group of seven security researchers have discovered numerous vulnerabilities in vehicles from 16 car makers, including bugs that allowed them to control car...


A researcher at IOActive discovered that home security systems from SimpliSafe are plagued by a vulnerability that allows tech savvy burglars to remotely disable...


Patch Tuesday: Microsoft calls attention to a series of zero-day remote code execution attacks hitting its Office productivity suite.