DNSpooq Flaws Allow DNS Hijacking of Millions of Devices

Researchers have uncovered a set of flaws in dnsmasq, popular open-source software used for caching Domain Name System DNS responses for home and commercial routers and servers. The set of seven flaws are comprised of buffer overflow issues and flaws allowing for DNS cache-poisoning attacks also...

dnsmasq: loose address/port 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 the forward.c:replyquery if the reply destination address/port is used by the pending forwarded queries. However, it does not use the address/port to retrieve the exact forwarded query, substantially...

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...

CVE-2020-25684

A flaw was found in dnsmasq. When getting a reply from a forwarded query, dnsmasq checks in the forward.c:replyquery if the reply destination address/port is used by the pending forwarded queries. However, it does not use the address/port to retrieve the exact forwarded query, substantially...

dnsmasq: loose address/port 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 the forward.c:replyquery if the reply destination address/port is used by the pending forwarded queries. However, it does not use the address/port to retrieve the exact forwarded query, substantially...

CVE-2020-25685

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...

A Set of Severe Flaws Affect Popular DNSMasq DNS Forwarder

Cybersecurity researchers have uncovered multiple vulnerabilities in Dnsmasq, a popular open-source software used for caching Domain Name System DNS responses, thereby potentially allowing an adversary to mount DNS cache poisoning attacks and remotely execute malicious code. The seven flaws,...

CVE-2020-25685

A flaw was found in dnsmasq before version 2.83. 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 DNSSE...

CVE-2020-25684

A flaw was found in dnsmasq before version 2.83. When getting a reply from a forwarded query, dnsmasq checks in the forward.c:replyquery if the reply destination address/port is used by the pending forwarded queries. However, it does not use the address/port to retrieve the exact forwarded query,...

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...

dnsmasq < 2.83 Multiple Vulnerabilities (DNSPOOQ)

The version of dnsmasq installed on the remote host is prior to 2.83. It is, therefore, affected by multiple vulnerabilities: - Multiple remote buffer overflows in the DNSSEC implementation. CVE-2020-25681, CVE-2020-25682, CVE-2020-25683, CVE-2020-25687 - A UDP DNS cache poisoning vulnerability...

CVE-2020-17470

An issue was discovered in FNET through 4.6.4. The code that initializes the DNS client interface structure does not set sufficiently random transaction IDs they are always set to 1 in fnetdnspoll in fnetdns.c. This significantly simplifies DNS cache poisoning attacks...

CVE-2020-17439

An issue was discovered in uIP 1.0, as used in Contiki 3.0 and other products. The code that parses incoming DNS packets does not validate that the incoming DNS replies match outgoing DNS queries in newdata in resolv.c. Also, arbitrary DNS replies are parsed if there was any outgoing DNS query wi...

CVE-2020-17439

An issue was discovered in uIP 1.0, as used in Contiki 3.0 and other products. The code that parses incoming DNS packets does not validate that the incoming DNS replies match outgoing DNS queries in newdata in resolv.c. Also, arbitrary DNS replies are parsed if there was any outgoing DNS query wi...

Code injection

An issue was discovered in FNET through 4.6.4. The code that initializes the DNS client interface structure does not set sufficiently random transaction IDs they are always set to 1 in fnetdnspoll in fnetdns.c. This significantly simplifies DNS cache poisoning attacks...

Default configuration

An issue was discovered in uIP 1.0, as used in Contiki 3.0 and other products. The code that parses incoming DNS packets does not validate that the incoming DNS replies match outgoing DNS queries in newdata in resolv.c. Also, arbitrary DNS replies are parsed if there was any outgoing DNS query wi...

CVE-2020-17439

An issue was discovered in uIP 1.0, as used in Contiki 3.0 and other products. The code that parses incoming DNS packets does not validate that the incoming DNS replies match outgoing DNS queries in newdata in resolv.c. Also, arbitrary DNS replies are parsed if there was any outgoing DNS query wi...

Microsoft Releases Windows Update (Dec 2020) to Fix 58 Security Flaws

Microsoft on Tuesday released fixes for 58 newly discovered security flaws spanning as many as 11 products and services as part of its final Patch Tuesday of 2020, effectively bringing their CVE total to 1,250 for the year. Of these 58 patches, nine are rated as Critical, 46 are rated as Importan...

Multiple Embedded TCP/IP Stacks

1. EXECUTIVE SUMMARY CVSS v3 9.8 ATTENTION: Exploitable remotely/low skill level to exploit Vendor: Multiple open source Equipment: uIP-Contiki-OS, uIP-Contiki-NG, uIP, open-iscsi, picoTCP-NG, picoTCP, FNET, Nut/Net Vulnerabilities: Infinite Loop, Integer Wraparound, Out-of-bounds Read, Integer...

Consul DNS and HTTP Cache Abuse Denial of Service

Summary Consul and Consul Enterprise include an HTTP API introduced in 1.2.0 and DNS introduced in 1.4.3 caching feature that was vulnerable to denial of service. This vulnerability, CVE-2020-13250, was fixed in Consul 1.6.6 and 1.7.4. Background Consul 1.2.0 introduced an agent cache to ease...