CVE-2017-14491: [Dnsmasq-discuss] Announce: dnsmasq-2.78.

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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