Security Bulletin: IBM i is affected by networking BIND vulnerabilities (CVE-2017-3136, CVE-2017-3137 and CVE-2017-3138)

Summary

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

Vulnerability Details

CVEID: CVE-2017-3138 DESCRIPTION: ISC BIND is vulnerable to a denial of service, caused by an error related to the processing of control channel commands. By sending a specially crafted command, a remote attacker with access to the BIND control channel could exploit this vulnerability to make named exit unexpectedly with an assertion failure.
CVSS Base Score: 6.5
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/124518 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)

CVEID: CVE-2017-3136 DESCRIPTION: ISC BIND is vulnerable to a denial of service, caused by the improper handling of query requests when using DNS64 with “break-dnssec yes” option. By sending a specially crafted DNS request, a remote attacker could exploit this vulnerability to make named exit unexpectedly with an assertion failure.
CVSS Base Score: 5.9
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/124516 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H)

CVEID: CVE-2017-3137 DESCRIPTION: ISC BIND is vulnerable to a denial of service, caused by the improper handling of a query response containing CNAME or DNAME resource records in an unusual order. By sending a specially crafted DNS response, a remote attacker could exploit this vulnerability to make named exit unexpectedly with an assertion failure.
CVSS Base Score: 7.5
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/124517 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 – SI64617 Release 7.1 – SI64615 Release 7.2 – SI64630 Release 7.3 – SI64614

_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