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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
SHA-256 | e42a5bdd054f191f80e2ffa56b1efcc9969c7a22e49b0f34c75af8093966adec
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
SHA-256 | 034eb3e36fb41523c183cce7fb7db81b540b3f41c75420847bab7b9527045d5c
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
SHA-256 | 49977143520cecce774113ea2a67d42ba9b82c061e235564ca9f6f24094c01be
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
SHA-256 | dbb2906dd388b0ae05e96eb75aa85f2757386ed1012ef745eb72036c24c8f74c
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
SHA-256 | 7326769caf10d825eb5619b9f2d8672b070282d65b70e5a85363a2d1c93e45d0
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
SHA-256 | c2e3eb73bcb1335246ba4b75aa396d2cda0e351c17f60e52b2aed87cda2e30f6
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
SHA-256 | d74f76a7c852d4e7f3291ec2d0874f62ca39a4044f320676208797e0e34e79a6
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
SHA-256 | 54a1700ca996bed8d204dd3114fd45a0e703d3d1ac9e22020de24b48a9926ae8
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
SHA-256 | 601d693d3116b894a5266fff04bebe2a7036af4dd8ba10f3a8eb1a4898eeb5f6
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
SHA-256 | fe0023c6ee15192e0d3139b7bd4dcbcd90821f565b10180db88ba58908ca07a0
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
SHA-256 | 1e4e0f76e6eb80ac82ec2d706968beb107e3975182cf9f9da50a976d22dad8df
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
SHA-256 | 5cacb245ded9cb0275435d6d03ed5404c38a386848e0aebb23e203773a840c87
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
SHA-256 | 9b59a676f7ab63b37837fc8aca08d6a1fcfb43fdce5b00d2ab7a4fb5581caad6
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
SHA-256 | edf41284ec526e49fbfc0b6cad88932a74ce20dec21784a5789b3eaf7d4ba150
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
SHA-256 | 9c1f6232a679d122ff8827bec18d6a2293e60660e241bd6df7f98f81f663017a
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