CVE-2020-25687

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.

Link	Resource
https://www.jsof-tech.com/disclosures/dnspooq/	Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1891568	Issue Tracking Patch
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WYW3IR6APUSKOYKL5FT3ACTIHWHGQY32/	Mailing List Third Party Advisory
https://security.gentoo.org/glsa/202101-17	Third Party Advisory
https://www.debian.org/security/2021/dsa-4844	Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QGB7HL3OWHTLEPSMLDGOMXQKG3KM2QME/	Mailing List Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/03/msg00027.html	Mailing List Third Party Advisory

Configuration 1

cpe:2.3:a:thekelleys:dnsmasq:*:*:*:*:*:*:*:* cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:* cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*

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Published : 2021-01-20 05:15

Updated : 2021-03-26 06:40

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NVD link : CVE-2020-25687

Mitre link : CVE-2020-25687

No products.

CWE-122