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CVE-2017-13704

Description

In dnsmasq before 2.78, if the DNS packet size does not match the expected size, the size parameter in a memset call gets a negative value. As it is an unsigned value, memset ends up writing up to 0xffffffff zero's (0xffffffffffffffff in 64 bit platforms), making dnsmasq crash.

POC

Reference

- http://thekelleys.org.uk/dnsmasq/CHANGELOG

- https://security.googleblog.com/2017/10/behind-masq-yet-more-dns-and-dhcp.html

Github

No PoCs found on GitHub currently.