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CVE-2020-25683

Status Candidate

Overview

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.

Related Files

Red Hat Security Advisory 2021-0281-01
Posted Feb 3, 2021
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2021-0281-01 - Red Hat OpenShift Container Platform is Red Hat's cloud computing Kubernetes application platform solution designed for on-premise or private cloud deployments.

tags | advisory
systems | linux, redhat
advisories | CVE-2020-14382, CVE-2020-2304, CVE-2020-2305, CVE-2020-25681, CVE-2020-25682, CVE-2020-25683, CVE-2020-25684, CVE-2020-25685, CVE-2020-25686, CVE-2020-25687, CVE-2020-25694, CVE-2020-25696, CVE-2020-8559, CVE-2020-8564, CVE-2021-20182
MD5 | e33fa7c834c8fb9a3c759afb31e4f19b
Gentoo Linux Security Advisory 202101-17
Posted Jan 25, 2021
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory 202101-17 - Multiple vulnerabilities have been found in Dnsmasq, the worst of which may allow remote attackers to execute arbitrary code. Versions less than 2.83 are affected.

tags | advisory, remote, arbitrary, vulnerability
systems | linux, gentoo
advisories | CVE-2020-25681, CVE-2020-25682, CVE-2020-25683, CVE-2020-25684, CVE-2020-25685, CVE-2020-25686, CVE-2020-25687
MD5 | 7750b198c014af30d3b3f03bb217b63a
Red Hat Security Advisory 2021-0151-01
Posted Jan 19, 2021
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2021-0151-01 - The dnsmasq packages contain Dnsmasq, a lightweight DNS forwarder and DHCP server. Issues addressed include a buffer overflow vulnerability.

tags | advisory, overflow
systems | linux, redhat
advisories | CVE-2020-25681, CVE-2020-25682, CVE-2020-25683, CVE-2020-25684, CVE-2020-25685, CVE-2020-25686, CVE-2020-25687
MD5 | f156d2db68fc8b04040bae82ed71a5e0
Red Hat Security Advisory 2021-0152-01
Posted Jan 19, 2021
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2021-0152-01 - The dnsmasq packages contain Dnsmasq, a lightweight DNS forwarder and DHCP server. Issues addressed include a buffer overflow vulnerability.

tags | advisory, overflow
systems | linux, redhat
advisories | CVE-2020-25681, CVE-2020-25682, CVE-2020-25683, CVE-2020-25684, CVE-2020-25685, CVE-2020-25686, CVE-2020-25687
MD5 | ad61d64f250080153a6e4678b4ba99ba
Red Hat Security Advisory 2021-0150-01
Posted Jan 19, 2021
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2021-0150-01 - The dnsmasq packages contain Dnsmasq, a lightweight DNS forwarder and DHCP server. Issues addressed include a buffer overflow vulnerability.

tags | advisory, overflow
systems | linux, redhat
advisories | CVE-2020-25681, CVE-2020-25682, CVE-2020-25683, CVE-2020-25684, CVE-2020-25685, CVE-2020-25686, CVE-2020-25687
MD5 | 32b1221158a65c38b61ef49372a3c09d
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