dnsmasq: heap-based buffer overflow with large memcpy in get_rdata() when DNSSEC is enabled

A flaw was found in dnsmasq. 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 cause...

dnsmasq: heap-based buffer overflow in sort_rrset() when DNSSEC is enabled

A flaw was found in dnsmasq. A heap-based buffer overflow was discovered in the way RRSets are sorted before validating with DNSSEC data. An attacker on the network, who can forge DNS replies such as that they are accepted as valid, could use this flaw to cause a buffer overflow with arbitrary da...

dnsmasq: loose query name check in reply_query() makes forging replies easier for an off-path attacker

A flaw was found in dnsmasq. When getting a reply from a forwarded query, dnsmasq checks in forward.c:replyquery, 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...

dnsmasq: heap-based buffer overflow with large memcpy in sort_rrset() when DNSSEC is enabled

A flaw was found in dnsmasq. 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 b...

dnsmasq: buffer overflow in extract_name() due to missing length check when DNSSEC is enabled

A flaw was found in dnsmasq. A buffer overflow vulnerability was discovered in the way dnsmasq extract names from DNS packets before validating them with DNSSEC data. An attacker on the network, who can create valid DNS replies, could use this flaw to cause an overflow with arbitrary data in a...

Security Advisory 2021-01-19-1 - dnsmasq multiple vulnerabilities (CVE-2020-25681, CVE-2020-25682, CVE-2020-25683, CVE-2020-25684, CVE-2020-25685, CVE-2020-25686, CVE-2020-25687)

DESCRIPTION Dnsmasq has two sets of vulnerabilities, one set of memory corruption issues handling DNSSEC and a second set of issues validating DNS responses. These vulnerabilities could allow an attacker to corrupt memory on the target device and perform cache poisoning attacks against the target...

NSA Releases Guidance on Encrypted DNS in Enterprise Environments  

The National Security Agency NSA has released an information sheet with guidance on adopting encrypted Domain Name System DNS over Hypertext Transfer Protocol over Transport Layer Security HTTPS, referred to as DNS over HTTPS DoH. When configured appropriately, strong enterprise DNS controls can...

DEBIAN-CVE-2020-25829

An issue has been found in PowerDNS Recursor before 4.1.18, 4.2.x before 4.2.5, and 4.3.x before 4.3.5. A remote attacker can cause the cached records for a given name to be updated to the Bogus DNSSEC validation state, instead of their actual DNSSEC Secure state, via a DNS ANY query. This result...

Akamai Drives New Standards and Enhances Authoritative DNS and Load Balancing Services

For more than 20 years, Akamai's customers have trusted our global edge platform to deliver their content, secure their web applications, and accelerate end-user experiences. As the basis for our mapping functions, Akamai DNS has always been essential to the reliability and performance of our...

Akamai, CISA, and CIS Join Forces to Improve SLTT Cyber Defenses

Cybercriminals continue to target U.S. state, local, tribal, and territorial SLTT government organizations. In 2019, there were more than 100 ransomware attacks -- including an attack on Baltimore's IT systems that locked out thousands of computers and disrupted nearly every city service. This...

OSV-2020-179 Heap-buffer-overflow in get16

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=20832 Crash type: Heap-buffer-overflow READ 2 Crash state: get16 searchvaliddns ndpisearchdns...

Innovation Driven by Operational Experience and Engineering Insight Deters NXNS Attacks

DNS and security have had a long and tangled relationship. The DNS has always been an attractive target since it's a network leverage point. At DNS OARC 30 in Bangkok in 2019, Akamai's Ralf Weber did a presentation called DNS Security: Past, Present, and Future It's Not Easy covering numerous DNS...

PowerDNS Recursor Input Validation Error Vulnerability

PowerDNS Recursor pdnsrecursor is a domain name resolution server from the Dutch company PowerDNS. A security vulnerability exists in PowerDNS Recursor versions 4.1.0 through 4.3.0 that stems from a failure to properly validate DNSSEC signatures. An attacker could exploit the vulnerability to...

DEBIAN-CVE-2020-12244

An issue has been found in PowerDNS Recursor 4.1.0 through 4.3.0 where records in the answer section of a NXDOMAIN response lacking an SOA were not properly validated in SyncRes::processAnswer, allowing an attacker to bypass DNSSEC validation...

Three Areas to Consider, to Focus Your Cyber-Plan

How’s this for concerning news: Half of all organizations don’t have the wherewithal to stop malicious actors from stealing sensitive information, taking down critical assets or damaging customer trust. According to a recent report from FireEye, 51 percent of organizations don’t believe they are...

The Benefits of a Single Provider DNS Platform

I've written in previous blogs about the value of using DNS as a security control point and how using a DNS based security solution like Akamai's Enterprise Threat Protector can help accelerate your transition to a Zero Trust security approach. In this blog, I'm going to cover how in addition to...

systemd: systemd-resolved allows unprivileged users to configure DNS

An improper authorization flaw was discovered in systemd-resolved in the way it configures the exposed DBus interface org.freedesktop.resolve1. An unprivileged local attacker could call all DBus methods, even when marked as privileged operations. An attacker could abuse this flaw by changing the...

ALPINE-CVE-2019-6475

Mirror zones are a BIND feature allowing recursive servers to pre-cache zone data provided by other servers. A mirror zone is similar to a zone of type secondary, except that its data is subject to DNSSEC validation before being used in answers, as if it had been looked up via traditional...

DNS Protection: A "Must" in Security Solutions for any Company

Domain name system DNS services are often a point of vulnerability for businesses, so DNS security has become a growing concern for many of them. DNS is a critical element for all companies because it turns domain names into internet protocol IP addresses. Cyber criminals have been digging into D...

Malvertising: Online advertising's darker side

By Nick Biasini, Chris Neal and Matt Valites. Executive summary One of the trickiest challenges enterprises face is managing the balance between aggressively blocking malicious advertisements aka malvertising and allowing content to remain online, accessible for the average user. The days of...