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
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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)
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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
