A flaw was found in dnsmasq before version 2.83. A heap...
High severity
Unreviewed
Published
May 24, 2022
to the GitHub Advisory Database
•
Updated Jan 29, 2023
Description
Published by the National Vulnerability Database
Jan 20, 2021
Published to the GitHub Advisory Database
May 24, 2022
Last updated
Jan 29, 2023
A flaw was found in dnsmasq before version 2.83. A heap-based buffer overflow was discovered in dnsmasq when DNSSEC is enabled and before it validates the received DNS entries. This flaw allows a remote attacker, who can create valid DNS replies, 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 sort_rrset() and cause a crash in dnsmasq, resulting in a denial of service. The highest threat from this vulnerability is to system availability.
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