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CVE-2020-25685

Status Candidate

Overview

A flaw was found in dnsmasq before version 2.83. When getting a reply from a forwarded query, dnsmasq checks in forward.c:reply_query(), which is the forwarded query that matches the reply, by only using a weak hash of the query name. Due to the weak hash (CRC32 when dnsmasq is compiled without DNSSEC, SHA-1 when it is) this flaw allows an off-path attacker to find several different domains all having the same hash, substantially reducing the number of attempts they would have to perform to forge a reply and get it accepted by dnsmasq. This is in contrast with RFC5452, which specifies that the query name is one of the attributes of a query that must be used to match a reply. This flaw could be abused to perform a DNS Cache Poisoning attack. If chained with CVE-2020-25684 the attack complexity of a successful attack is reduced. The highest threat from this vulnerability is to data integrity.

Related Files

Ubuntu Security Notice USN-4698-2
Posted Feb 25, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4698-2 - USN-4698-1 fixed vulnerabilities in Dnsmasq. The updates introduced regressions in certain environments related to issues with multiple queries, and issues with retries. This update fixes the problem. Moshe Kol and Shlomi Oberman discovered that Dnsmasq incorrectly handled memory when sorting RRsets. A remote attacker could use this issue to cause Dnsmasq to hang, resulting in a denial of service, or possibly execute arbitrary code. Moshe Kol and Shlomi Oberman discovered that Dnsmasq incorrectly handled extracting certain names. A remote attacker could use this issue to cause Dnsmasq to hang, resulting in a denial of service, or possibly execute arbitrary code. Moshe Kol and Shlomi Oberman discovered that Dnsmasq incorrectly implemented address/port checks. A remote attacker could use this issue to perform a cache poisoning attack. Moshe Kol and Shlomi Oberman discovered that Dnsmasq incorrectly implemented query resource name checks. A remote attacker could use this issue to perform a cache poisoning attack. Moshe Kol and Shlomi Oberman discovered that Dnsmasq incorrectly handled multiple query requests for the same resource name. A remote attacker could use this issue to perform a cache poisoning attack. It was discovered that Dnsmasq incorrectly handled memory during DHCP response creation. A remote attacker could possibly use this issue to cause Dnsmasq to consume resources, leading to a denial of service. This issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS. Various other issues were also addressed.

tags | advisory, remote, denial of service, arbitrary, vulnerability
systems | linux, ubuntu
advisories | CVE-2019-14834, CVE-2020-25684, CVE-2020-25685, CVE-2020-25686
MD5 | d9480652e5dc691b11f3f1725a0b37f0
Red Hat Security Advisory 2021-0401-01
Posted Feb 3, 2021
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2021-0401-01 - The redhat-virtualization-host packages provide the Red Hat Virtualization Host. These packages include redhat-release-virtualization-host, ovirt-node, and rhev-hypervisor. Red Hat Virtualization Hosts are installed using a special build of Red Hat Enterprise Linux with only the packages required to host virtual machines. RHVH features a Cockpit user interface for monitoring the host's resources and performing administrative tasks. Issues addressed include a buffer overflow vulnerability.

tags | advisory, overflow
systems | linux, redhat
advisories | CVE-2020-25684, CVE-2020-25685, CVE-2020-25686, CVE-2021-3156
MD5 | 24c6fa2bfbfc2f9ad14973ffa61a86f9
Red Hat Security Advisory 2021-0395-01
Posted Feb 3, 2021
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2021-0395-01 - The redhat-virtualization-host packages provide the Red Hat Virtualization Host. These packages include redhat-release-virtualization-host. Red Hat Virtualization Hosts are installed using a special build of Red Hat Enterprise Linux with only the packages required to host virtual machines. RHVH features a Cockpit user interface for monitoring the host's resources and performing administrative tasks. Issues addressed include a buffer overflow vulnerability.

tags | advisory, overflow
systems | linux, redhat
advisories | CVE-2020-25684, CVE-2020-25685, CVE-2020-25686, CVE-2021-3156
MD5 | e12bc9820fce567650f94001d9378956
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
Red Hat Security Advisory 2021-0245-01
Posted Jan 25, 2021
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2021-0245-01 - The dnsmasq packages contain Dnsmasq, a lightweight DNS forwarder and DHCP server.

tags | advisory
systems | linux, redhat
advisories | CVE-2020-25684, CVE-2020-25685, CVE-2020-25686
MD5 | 69b6260e8278295f83d54785a0bf7343
Red Hat Security Advisory 2021-0240-01
Posted Jan 25, 2021
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2021-0240-01 - The dnsmasq packages contain Dnsmasq, a lightweight DNS forwarder and DHCP server.

tags | advisory
systems | linux, redhat
advisories | CVE-2020-25684, CVE-2020-25685, CVE-2020-25686
MD5 | c788652d53eb63e70ef37c0318966887
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 2021-0155-01
Posted Jan 19, 2021
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2021-0155-01 - The dnsmasq packages contain Dnsmasq, a lightweight DNS forwarder and DHCP server.

tags | advisory
systems | linux, redhat
advisories | CVE-2020-25684, CVE-2020-25685, CVE-2020-25686
MD5 | f27af30f893cb1363b6789d87bbb4782
Red Hat Security Advisory 2021-0154-01
Posted Jan 19, 2021
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2021-0154-01 - The dnsmasq packages contain Dnsmasq, a lightweight DNS forwarder and DHCP server.

tags | advisory
systems | linux, redhat
advisories | CVE-2020-25684, CVE-2020-25685, CVE-2020-25686
MD5 | c36bd74c0ec419171c1e8b8d1b0973a6
Red Hat Security Advisory 2021-0153-01
Posted Jan 19, 2021
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2021-0153-01 - The dnsmasq packages contain Dnsmasq, a lightweight DNS forwarder and DHCP server.

tags | advisory
systems | linux, redhat
advisories | CVE-2020-25684, CVE-2020-25685, CVE-2020-25686
MD5 | 5a5d272b4aad641509f27f786903ddcb
Red Hat Security Advisory 2021-0156-01
Posted Jan 19, 2021
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2021-0156-01 - The dnsmasq packages contain Dnsmasq, a lightweight DNS forwarder and DHCP server.

tags | advisory
systems | linux, redhat
advisories | CVE-2020-25684, CVE-2020-25685, CVE-2020-25686
MD5 | fae973e597c8e1b49d5833311c980208
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
Ubuntu Security Notice USN-4698-1
Posted Jan 19, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4698-1 - Moshe Kol and Shlomi Oberman discovered that Dnsmasq incorrectly handled memory when sorting RRsets. A remote attacker could use this issue to cause Dnsmasq to hang, resulting in a denial of service, or possibly execute arbitrary code. Moshe Kol and Shlomi Oberman discovered that Dnsmasq incorrectly handled extracting certain names. A remote attacker could use this issue to cause Dnsmasq to hang, resulting in a denial of service, or possibly execute arbitrary code. Various other issues were also addressed.

tags | advisory, remote, denial of service, arbitrary
systems | linux, ubuntu
advisories | CVE-2019-14834, CVE-2020-25684, CVE-2020-25685, CVE-2020-25686
MD5 | 6a28aafbdc7142b8cedf9f08b7ed394c
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