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CVE-2020-25687 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. 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.

EPSS 23.25% · 95.9th percentile

Risk Scores

EPSS Score
23.25%
95.9th percentile

Affected Products

VendorProductVersions
Ubuntu:16.04:LTSdnsmasq0, 2.75-1, 2.75-1ubuntu0.16.04.1
Ubuntu:20.04:LTSdnsmasq2.80-1.1ubuntu1, 0, 2.80-1ubuntu2
Ubuntu:18.04:LTSdnsmasq0, 2.78-1, 2.78-3

Timeline

References

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