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CVE-2020-25683 PUBLISHED

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. 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.

EPSS 31.32% · 96.7th percentile

Risk Scores

EPSS Score
31.32%
96.7th percentile

Affected Products

VendorProductVersions
Ubuntu:Pro:14.04:LTSdnsmasq2.66-4ubuntu1, 2.67-1, 2.68-1
Ubuntu:20.04:LTSdnsmasq2.80-1ubuntu2, 0, 2.80-1ubuntu4
Ubuntu:18.04:LTSdnsmasq2.78-3, 2.79-1, 2.78-1
Ubuntu:16.04:LTSdnsmasq2.75-1, 2.75-1ubuntu0.16.04.2, 2.75-1ubuntu0.16.04.4

Timeline

References

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