Results for bind

Threat Research

The Analysis of ISC BIND Response Authority Section RRSIG Missing DoS (CVE-2016-9444)

Domain Name System Security Extensions (DNSSEC) secures the Domain Name System (DNS), right? Yes, but that’s not the whole story. DNSSEC can also introduce troubles into your DNS server. Recently, a BIND bug caused by a missing RRSIG record, which is a part of DNSSEC, was fixed by a patch from the Internet Systems Consortium (ISC). This bug affects all versions of BIND recursive servers, and can cause a denial of service (DoS.) This potential DoS vulnerability is caused by a RUNTIME CHECK error in Resolver.c when handling the DNS...

By Dehui Yin February 06, 2017

Threat Research

Analysis of ISC BIND TKEY Query Response Handling DoS (CVE-2016-9131)

Another TKEY record-related bug in BIND has been fixed with a patch from the Internet Systems Consortium (ISC) that was released just after the New Year. This bug may take down BIND recursive servers by sending a simple query response with TKEY record, thereby causing a denial of service (DoS). This potential DoS vulnerability is caused by an assertion failure in Resolver.c when caching the DNS response with TKEY Record. In this post we will analyze the BIND source codes and expose the root cause of this vulnerability. The TKEY record...

By Dehui Yin January 18, 2017

Threat Research

Analysis of ISC BIND DNAME Answer Handling DoS (CVE-2016-8864)

A defect in BIND's handling of a DNAME answer was fixed in a critical update from the Internet Systems Consortium (ISC) several days ago. This defect affects all BIND recursive servers, and can be exploited to remotely take down recursive servers by sending a simple DNAME answer thereby causing a denial of service (DoS.) This potential DoS vulnerability is caused by an assertion failure in Resolver.c or Db.c when caching the DNS response with DNAME Record. In this post we will examine the underlying code and expose the root cause of this...

By Dehui Yin November 08, 2016

Threat Research

Internet In Danger: Analysis of ISC Bind Patch (part 2)

In this second part article, we analyze two recent vulnerabilities in ISC BIND identified as CVE-2016-1286 and CVE-2016-2088. Based on advisories, these bugs can be triggered using a malformed DNAME record (CVE-2016-1286) or an OPT COOKIE records (CVE-2016-2088). These two bugs share the same attack scenario that can only be triggered when a BIND server makes a request and then receives a malformed response. Based on this requirement, recursive servers are at highest risk to this attack, because it’s not straightforward to ask an authoritative-only...

By Amir Zali April 01, 2016

Threat Research

Internet In Danger: Analysis of ISC Bind Patch (part 1)

The Internet Systems Consortium just released a couple of days ago a new patch (version 9.10.3-P4) to fix some issues in the most popular DNS server software in the world. The release note is available at https://kb.isc.org/article/AA-01363/81/BIND-9.10.3-P4-Release-Notes.html In this series of two articles, we will detail our investigation of these vulnerabilities and how we were able to protect our customers by deploying widely our detection. ISC released a patch for the BIND rndc control channel DoS vulnerability (CVE-2016-1285)....

By Dehui Yin March 29, 2016

Threat Research

Internet Kill Switch Found?

Last week, the Internet Systems Consortium (ISC) released a critical update to its popular software, BIND. BIND is almost everywhere on the Internet, acting as a DNS name server. DNS is a network service used to translate human-readable domain names to numeric identifiers called IP addresses and vice-versa. The update was in response to a recently discovered DoS vulnerability (CVE-2015-5477), which can be exploited to take down the vulnerable BIND server remotely. ISC released an urgent patch for this vulnerability due to its severity. Only...

By Dehui Yin August 12, 2015