Security Bulletin: IBM i is affected by networking BIND vulnerabilities (CVE-2016-9131, CVE-2016-9444, CVE-2016-9147, CVE-2016-9778 and CVE-2017-3135)

Summary

ISC BIND is vulnerable to several security vulnerabilities. IBM i has addressed these vulnerabilities.

Vulnerability Details

CVEID: CVE-2016-9778 DESCRIPTION: ISC BIND is vulnerable to a denial of service, caused by the improper handling of specific queries when using the nxdomain-redirect feature. By sending a malformed query, a remote attacker could exploit this vulnerability to trigger a REQUIRE assertion failure in db.c.
CVSS Base Score: 7.5
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/120475 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

CVEID: CVE-2016-9131 DESCRIPTION: ISC BIND is vulnerable to a denial of service, caused by the improper handling of responses during recursion. By sending a malformed response to a RTYPE ANY query, a remote attacker could exploit this vulnerability to trigger an assertion failure.
CVSS Base Score: 7.5
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/120472 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

CVEID: CVE-2016-9444 DESCRIPTION: ISC BIND is vulnerable to a denial of service, caused by the improper handling of responses containing a DS resource record. By sending a specially-constructed answer, a remote attacker could exploit this vulnerability to trigger an assertion failure.
CVSS Base Score: 7.5
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/120474 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

CVEID: CVE-2016-9147 DESCRIPTION: ISC BIND is vulnerable to a denial of service, caused by the improper handling of responses containing DNSSEC-related RRsets that are inconsistent with other RRsets in the same query response. By sending a malformed response, a remote attacker could exploit this vulnerability to trigger an assertion failure.
CVSS Base Score: 7.5
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/120473 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

CVEID: CVE-2017-3135 DESCRIPTION: ISC BIND is vulnerable to a denial of service, caused by an error when using both DNS64 and RPZ to rewrite query responses. A remote attacker could exploit this vulnerability to trigger an INSIST assertion failure.
CVSS Base Score: 7.5
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/121740 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

Affected Products and Versions

Releases 6.1, 7.1, 7.2 and 7.3 of IBM i are affected.

Remediation/Fixes

The issue can be fixed by applying a PTF to IBM i.

Releases 6.1, 7.1, 7.2 and 7.3 of IBM i are supported and will be fixed.

http://www-933.ibm.com/support/fixcentral/

The IBM i PTF numbers are:

Release 6.1 – SI63775 Release 7.1 – SI63774 Release 7.2 – SI63769 Release 7.3 – SI63767

_Important note: _IBM recommends that all users running unsupported versions of affected products upgrade to supported and fixed version of affected products.

Workarounds and Mitigations

None known