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SciLinux: SLSA-2017:2836-1 Critical: dnsmasq Heap Overflow

Calendar Oct 02, 2017 • User Avatar LinuxSecurity Advisories
2 - 3 min read
Scientific Large Esm H446
Topics%20covered

Topics Covered

security advisory buffer overflow critical security fix heap overflow network attack dnsmasq
A heap buffer overflow was found in dnsmasq in the code responsible for building DNS replies. An attacker could send crafted DNS packets to dnsmasq which would cause it to crash or, potentially, execute arbitrary code. (CVE-2017-14491) * A heap buffer overflow was discovered in dnsmasq in the IPv6 router advertisement (RA) handling code. An attacker on the local network segment could send cra [More...] 
Synopsis:          Critical: dnsmasq security update
Advisory ID:       SLSA-2017:2836-1
Issue Date:        2017-10-02
CVE Numbers:       CVE-2017-14491
                   CVE-2017-14492
                   CVE-2017-14493
                   CVE-2017-14494
                   CVE-2017-14495
                   CVE-2017-14496
--

Security Fix(es):

* A heap buffer overflow was found in dnsmasq in the code responsible for
building DNS replies. An attacker could send crafted DNS packets to
dnsmasq which would cause it to crash or, potentially, execute arbitrary
code. (CVE-2017-14491)

* A heap buffer overflow was discovered in dnsmasq in the IPv6 router
advertisement (RA) handling code. An attacker on the local network segment
could send crafted RAs to dnsmasq which would cause it to crash or,
potentially, execute arbitrary code. This issue only affected
configurations using one of these options: enable-ra, ra-only, slaac, ra-
names, ra-advrouter, or ra-stateless. (CVE-2017-14492)

* A stack buffer overflow was found in dnsmasq in the DHCPv6 code. An
attacker on the local network could send a crafted DHCPv6 request to
dnsmasq which would cause it to a crash or, potentially, execute arbitrary
code. (CVE-2017-14493)

* An information leak was found in dnsmasq in the DHCPv6 relay code. An
attacker on the local network could send crafted DHCPv6 packets to dnsmasq
causing it to forward the contents of process memory, potentially leaking
sensitive data. (CVE-2017-14494)

* A memory exhaustion flaw was found in dnsmasq in the EDNS0 code. An
attacker could send crafted DNS packets which would trigger memory
allocations which would never be freed, leading to unbounded memory
consumption and eventually a crash. This issue only affected
configurations using one of the options: add-mac, add-cpe-id, or add-
subnet. (CVE-2017-14495)

* An integer underflow flaw leading to a buffer over-read was found in
dnsmasq in the EDNS0 code. An attacker could send crafted DNS packets to
dnsmasq which would cause it to crash. This issue only affected
configurations using one of the options: add-mac, add-cpe-id, or add-
subnet. (CVE-2017-14496)
--

SL7
  x86_64
    dnsmasq-debuginfo-2.76-2.el7_4.2.x86_64.rpm
    dnsmasq-2.76-2.el7_4.2.x86_64.rpm
    dnsmasq-utils-2.76-2.el7_4.2.x86_64.rpm

- Scientific Linux Development Team