I've just released a new stable version of dnsmasq 2.78 Download is available at
http://thekelleys.org.uk/dnsmasq/dnsmasq-2.78.tar.gz This is a bugfix release, and, amongst other things, addresses a set of serious security vulnerabilities. Update should be mandatory. CHANGELOG is attached below. version 2.78 Fix logic of appending ".<layer>" to PXE basename. Thanks to Chris Novakovic for the patch. Revert ping-check of address in DHCPDISCOVER if there already exists a lease for the address. Under some circumstances, and netbooted windows installation can reply to pings before if has a DHCP lease and block allocation of the address it already used during netboot. Thanks to Jan Psota for spotting this. Fix DHCP relaying, broken in 2.76 and 2.77 by commit ff325644c7afae2588583f935f4ea9b9694eb52e. Thanks to John Fitzgibbon for the diagnosis and patch. Try other servers if first returns REFUSED when --strict-order active. Thanks to Hans Dedecker for the patch Fix regression in 2.77, ironically added as a security improvement, which resulted in a crash when a DNS query exceeded 512 bytes (or the EDNS0 packet size, if different.) Thanks to Christian Kujau, Arne Woerner Juan Manuel Fernandez and Kevin Darbyshire-Bryant for chasing this one down. CVE-2017-13704 applies. Fix heap overflow in DNS code. This is a potentially serious security hole. It allows an attacker who can make DNS requests to dnsmasq, and who controls the contents of a domain, which is thereby queried, to overflow (by 2 bytes) a heap buffer and either crash, or even take control of, dnsmasq. CVE-2017-14491 applies. Credit to Felix Wilhelm, Fermin J. Serna, Gabriel Campana Kevin Hamacher and Ron Bowes of the Google Security Team for finding this. Fix heap overflow in IPv6 router advertisement code. This is a potentially serious security hole, as a crafted RA request can overflow a buffer and crash or control dnsmasq. Attacker must be on the local network. CVE-2017-14492 applies. Credit to Felix Wilhelm, Fermin J. Serna, Gabriel Campana and Kevin Hamacher of the Google Security Team for finding this. Fix stack overflow in DHCPv6 code. An attacker who can send a DHCPv6 request to dnsmasq can overflow the stack frame and crash or control dnsmasq. CVE-2017-14493 applies. Credit to Felix Wilhelm, Fermin J. Serna, Gabriel Campana Kevin Hamacher and Ron Bowes of the Google Security Team for finding this. Fix information leak in DHCPv6. A crafted DHCPv6 packet can cause dnsmasq to forward memory from outside the packet buffer to a DHCPv6 server when acting as a relay. CVE-2017-14494 applies. Credit to Felix Wilhelm, Fermin J. Serna, Gabriel Campana Kevin Hamacher and Ron Bowes of the Google Security Team for finding this. Fix DoS in DNS. Invalid boundary checks in the add_pseudoheader function allows a memcpy call with negative size An attacker which can send malicious DNS queries to dnsmasq can trigger a DoS remotely. dnsmasq is vulnerable only if one of the following option is specified: --add-mac, --add-cpe-id or --add-subnet. CVE-2017-14496 applies. Credit to Felix Wilhelm, Fermin J. Serna, Gabriel Campana Kevin Hamacher and Ron Bowes of the Google Security Team for finding this. Fix out-of-memory Dos vulnerability. An attacker which can send malicious DNS queries to dnsmasq can trigger memory allocations in the add_pseudoheader function The allocated memory is never freed which leads to a DoS through memory exhaustion. dnsmasq is vulnerable only if one of the following option is specified: --add-mac, --add-cpe-id or --add-subnet. CVE-2017-14495 applies. Credit to Felix Wilhelm, Fermin J. Serna, Gabriel Campana Kevin Hamacher and Ron Bowes of the Google Security Team for finding this.
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