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.

References

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

http://thekelleys.org.uk/gitweb/?p=dnsmasq.git;a=commit;h=63437ffbb58837b214b4b92cb1c54bc5f3279928

http://www.securityfocus.com/bid/101085

http://www.securityfocus.com/bid/101977

http://www.securitytracker.com/id/1039474

https://access.redhat.com/security/vulnerabilities/3199382

https://cert-portal.siemens.com/productcert/pdf/ssa-689071.pdf

https://lists.fedoraproject.org/archives/list/[email protected]/message/4TK6DWC53WSU6633EVZL7H4PCWBYHMHK/

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

https://www.mail-archive.com/[email protected]/msg11664.html

https://www.mail-archive.com/[email protected]/msg11665.html

https://www.synology.com/support/security/Synology_SA_17_59_Dnsmasq

Details

Risk Information

CVSS v2

CVSS v3