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CVE-2020-25687

CVE-2020-25687

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 5.9 · Medium · EPSS 89.3% · Fix available

Published
Updated

Stack: system

Affected products and versions

  • dnsmasq

    Versions
    • dnsmasq 2.83: Affected

    No fix published

  • dnsmasq Debian:12

    Affected ranges
    • ECOSYSTEM: < 2.83-1

    Update to 2.83-1

  • dnsmasq Debian:13

    Affected ranges
    • ECOSYSTEM: < 2.83-1

    Update to 2.83-1

  • dnsmasq Debian:14

    Affected ranges
    • ECOSYSTEM: < 2.83-1

    Update to 2.83-1

  • dnsmasq Ubuntu:16.04:LTS

    Versions
    • 2.75-1
    • 2.75-1ubuntu0.16.04.1
    • 2.75-1ubuntu0.16.04.2
    • 2.75-1ubuntu0.16.04.3
    • 2.75-1ubuntu0.16.04.4
    • 2.75-1ubuntu0.16.04.5
    Affected ranges
    • ECOSYSTEM: < 2.75-1ubuntu0.16.04.7

    Update to 2.75-1ubuntu0.16.04.7

  • dnsmasq Ubuntu:18.04:LTS

    Versions
    • 2.78-1
    • 2.78-3
    • 2.79-1
    Affected ranges
    • ECOSYSTEM: < 2.79-1ubuntu0.2

    Update to 2.79-1ubuntu0.2

  • dnsmasq Ubuntu:20.04:LTS

    Versions
    • 2.80-1ubuntu2
    • 2.80-1ubuntu4
    • 2.80-1.1ubuntu1
    Affected ranges
    • ECOSYSTEM: < 2.80-1.1ubuntu1.2

    Update to 2.80-1.1ubuntu1.2

Original sources

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