A flaw was found in dnsmasq prior to 2.83. A buffer overflow vulnerability exists in the way dnsmasq extract names from DNS packets before validating them with DNSSEC data. An attacker on the network, who can create valid DNS replies, could use this flaw to cause an overflow with arbitrary data in a heap-allocated memory, possibly executing code on the machine. The flaw is in the rfc1035.c:extract_name() function, which writes data to the memory pointed by name assuming MAXDNAME*2 bytes are available in the buffer. However, in some code execution paths, it is possible extract_name() gets passed an offset from the base buffer, thus reducing, in practice, the number of available bytes that can be written in the buffer. The highest threat from this vulnerability is to data confidentiality and integrity as well as 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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