A flaw was found in dnsmasq before version 2.83. A heap-based buffer overflow exists in dnsmasq when DNSSEC is enabled and before it validates the received DNS entries. A remote attacker, who can create valid DNS replies, could use this flaw to cause an overflow in a heap-allocated memory. This flaw is caused by the lack of length checks in rfc1035.c:extract_name(), which could be abused to make the code execute memcpy() with a negative size in get_rdata() and cause a crash in dnsmasq, resulting in a denial of service. The highest threat from this vulnerability is to system availability.
| Vulnerable Product | Search on Vulmon | Subscribe to Product |
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thekelleys dnsmasq |
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fedoraproject fedora 32 |
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fedoraproject fedora 33 |
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debian debian linux 9.0 |
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debian debian linux 10.0 |
Get your updates when you can for gear from scores of manufacturers Two clichés, one headline: 'No good deed goes unpunished' and 'It's always DNS'
Seven vulnerabilities have been found in a popular DNS caching proxy and DHCP server known as dnsmasq, raising the possibility of widespread online attacks on networking devices. The flaws, collectively dubbed DNSpooq, were revealed on Tuesday by Israel-based security firm JSOF at the conclusion of a five-month coordinated disclosure period. The bugs are believed to affect products from more than 40 IT vendors, including Cisco, Comcast, Google, Netgear, Red Hat, and Ubiquiti, and major Linux dis...
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