Advisories ยป MGASA-2017-0367

Updated dnsmasq packages fix security vulnerabilities

Publication date: 09 Oct 2017
Modification date: 09 Oct 2017
Type: security
Affected Mageia releases : 5
CVE: CVE-2017-13704 , CVE-2017-14491 , CVE-2017-14492 , CVE-2017-14493 , CVE-2017-14494 , CVE-2017-14495 , CVE-2017-14496

Description

An audit by mozilla security found several vulnerability and potential
vulnerability in dnsmasq:
- Uninitialized buffer leads to memory leakage
- Allocated memory is not cleared
- Unchecked return value can lead to NULL pointer dereference
- Hardcoded values in fscanf() format strings with aliased buffers 

CVE-2017-13704: Dnsmasq could be made to crash on a large DNS query: A
DNS query received by UDP which exceeds 512 bytes (or the EDNS0 packet
size, if different.) is enough to cause SIGSEGV. (bug 21793)

CVE-2017-14491: 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-2017-14492: 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-2017-14493: 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-2017-14494: 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-2017-14495: 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-2017-14496: 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.

References

SRPMS

5/core