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7 Dnsmasq Security Flaws Discovered


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Found these on Thehackernews.com which links to the Google Blog describing these vulnerabilities: 

  • CVE-2017-14491—A DNS-based remote code execution vulnerability in Dnsmasq versions before 2.76 is marked as the most severe that allows for unrestricted heap overflows, affecting both directly exposed and internal network setups.
  • CVE-2017-14492—Another remote code execution vulnerability due to a DHCP-based heap overflow issue.
  • CVE-2017-14493—Another noteworthy DHCP-based remote code execution bug caused by a stack buffer overflow. According to Google, this flaw is trivial to exploit if it's used in conjunction with the flaw (CVE-2017-14494) mentioned below.
  • CVE-2017-14494—An information leak in DHCP which can be combined with CVE-2017-14493 to allow attackers bypass ASLR security mechanism and execute arbitrary code on a target system.
  • CVE-2017-14495—A flaw in Dnsmasq which can be exploited to launch a denial of service (DoS) attack by exhausting memory via DNS. The flaw impacts dnsmasq only if one of these options is used: --add-mac, --add-cpe-id or --add-subnet.
  • CVE-2017-14496—Google's Android operating system is specifically affected by this DoS issue which can be exploited by a local hacker or one who is tethered directly to the device. However, Google pointed out the service itself is sandboxed, so the risk to Android users is reduced.
  • CVE-2017-14497—Another DoS issue wherein a large DNS query can crash the software.
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