An error in handling certain queries can cause an assertion failure when a server is using the nxdomain-redirect feature to cover a zone for which it is also providing authoritative service. A vulnerable server could be intentionally stopped by an attacker if it was using a configuration that met the criteria for the vulnerability and if the attacker could cause it to accept a query that possessed the required attributes. Please note: This vulnerability affects the "nxdomain-redirect" feature, which is one of two methods of handling NXDOMAIN redirection, and is only available in certain versions of BIND. Redirection using zones of type "redirect" is not affected by this vulnerability. Affects BIND 9.9.8-S1 -> 9.9.8-S3, 9.9.9-S1 -> 9.9.9-S6, 9.11.0-9.11.0-P1.

The remote host is affected by the vulnerability described in GLSA-201708-01 (BIND: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in BIND. Please review the       CVE identifiers referenced below for details.
  Impact :

    A remote attacker could send a specially crafted DNS request to the BIND       resolver resulting in a Denial of Service condition.
  Workaround :

    There is no known workaround at this time.

Versions of ISC BIND 9.9.8-S prior to 9.9.8-S7, 9.9.9-S prior to 9.9.9-S7, and 9.11.0 prior to 9.11.0-P2 are unpatched for a flaw in the 'nxdomain-redirect' functionality in 'db.c' that is triggered when handling a specially crafted query. This may allow a remote attacker to cause a crash.

According to its self-reported version number, the instance of ISC BIND 9 running on the remote name server is 9.9.x prior to 9.9.9-P5 or 9.9.9-S7, 9.10.x prior to 9.10.4-P5, or 9.11.x prior to 9.11.0-P2. It is, therefore, affected by multiple denial of service vulnerabilities :

  - A denial of service vulnerability exists in named due to     a flaw that is triggered during the handling of a     specially crafted answer packet in a response to an     RTYPE ANY query. An unauthenticated, remote attacker can     exploit this to cause an assertion failure and daemon     exit. Note that this vulnerability affects versions     9.4.0 to 9.6-ESV-R11-W1, 9.8.5 to 9.8.8, 9.9.3 to     9.9.9-P4, 9.9.9-S1 to 9.9.9-S6, 9.10.0 to 9.10.4-P4, and     9.11.0 to 9.11.0-P1. (CVE-2016-9131)

  - A denial of service vulnerability exists in named in     DNSSEC-enabled authoritative servers that is triggered     during the handling of a query response that contains     inconsistent DNSSEC information. An unauthenticated,     remote attacker can exploit this to cause an assertion     failure and daemon exit. Note that this vulnerability     affects versions 9.9.9-P4, 9.9.9-S6, 9.10.4-P4, and     9.11.0-P1. (CVE-2016-9147)

  - A denial of service vulnerability exists in named due to     a flaw that is triggered during the handling of a     specially crafted answer that contains a DS resource     record. An unauthenticated, remote attacker can exploit     this to cause an assertion failure and daemon exit. Note     that this vulnerability affects versions 9.6-ESV-R9 to     9.6-ESV-R11-W1, 9.8.5 to 9.8.8, 9.9.3 to 9.9.9-P4,     9.9.9-S1 to 9.9.9-S6, 9.10.0 to 9.10.4-P4, and 9.11.0 to     9.11.0-P1. (CVE-2016-9444)

  - A denial of service vulnerability exists in named in the     nxdomain-redirect functionality that is triggered when     handling a specially crafted query. An unauthenticated,     remote attacker can exploit this to cause a REQUIRE     assertion failure and daemon exit. Note that this     vulnerability affects versions 9.9.8-S1 to 9.9.8-S3,     9.9.9-S1 to 9.9.9-S6, and 9.11.0-9.11.0 to P1.
    (CVE-2016-9778)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ISC reports :

A malformed query response received by a recursive server in response to a query of RTYPE ANY could trigger an assertion failure while named is attempting to add the RRs in the query response to the cache.

Depending on the type of query and the EDNS options in the query they receive, DNSSEC-enabled authoritative servers are expected to include RRSIG and other RRsets in their responses to recursive servers.
DNSSEC-validating servers will also make specific queries for DS and other RRsets. Whether DNSSEC-validating or not, an error in processing malformed query responses that contain DNSSEC-related RRsets that are inconsistent with other RRsets in the same query response can trigger an assertion failure. Although the combination of properties which triggers the assertion should not occur in normal traffic, it is potentially possible for the assertion to be triggered deliberately by an attacker sending a specially-constructed answer.

An unusually-formed answer containing a DS resource record could trigger an assertion failure. While the combination of properties which triggers the assertion should not occur in normal traffic, it is potentially possible for the assertion to be triggered deliberately by an attacker sending a specially-constructed answer having the required properties.

An error in handling certain queries can cause an assertion failure when a server is using the nxdomain-redirect feature to cover a zone for which it is also providing authoritative service. A vulnerable server could be intentionally stopped by an attacker if it was using a configuration that met the criteria for the vulnerability and if the attacker could cause it to accept a query that possessed the required attributes.

New bind packages are available for Slackware 13.0, 13.1, 13.37, 14.0, 14.1, 14.2, and -current to fix a security issue.

ID	Name	Product	Family	Severity
102531	GLSA-201708-01 : BIND: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	high
9967	ISC BIND 9.9.8-S < 9.9.8-S7 / 9.9.9-S < 9.9.9-S7 / 9.11.0 < 9.11.0-P2 DoS	Nessus Network Monitor	DNS Servers	high
96625	ISC BIND 9 < 9.9.9-P5 / 9.9.9-S7 / 9.10.4-P5 / 9.11.0-P2 Multiple DoS	Nessus	DNS	high
96473	FreeBSD : BIND -- multiple vulnerabilities (d4c7e9a9-d893-11e6-9b4d-d050996490d0)	Nessus	FreeBSD Local Security Checks	high
96407	Slackware 13.0 / 13.1 / 13.37 / 14.0 / 14.1 / 14.2 / current : bind (SSA:2017-011-01)	Nessus	Slackware Local Security Checks	medium

Detections

Analytics

CVE-2016-9778

medium

Tenable Plugins

high

high

high

high

medium