CVE-2018-5740: A flaw in the "deny-answer-aliases" feature can cause an assertion failure in named
First published: Wed Aug 08 2018(Updated: )
"deny-answer-aliases" is a little-used feature intended to help recursive server operators protect end users against DNS rebinding attacks, a potential method of circumventing the security model used by client browsers. However, a defect in this feature makes it easy, when the feature is in use, to experience an assertion failure in name.c. Affects BIND 9.7.0->9.8.8, 9.9.0->9.9.13, 9.10.0->9.10.8, 9.11.0->9.11.4, 9.12.0->9.12.2, 9.13.0->9.13.2.
Credit: security-officer@isc.org security-officer@isc.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/bind | <9.9.13 | 9.9.13 |
| redhat/bind | <9.10.8 | 9.10.8 |
| redhat/bind | <9.11.4 | 9.11.4 |
| redhat/bind | <9.12.2 | 9.12.2 |
| ISC BIND | >=9.7.0<9.8.8 | |
| ISC BIND | >=9.9.0<9.9.13 | |
| ISC BIND | >=9.10.0<9.10.8 | |
| ISC BIND | >=9.11.0<9.11.4 | |
| ISC BIND | >=9.12.0<9.12.2 | |
| ISC BIND | >=9.13.0<9.13.2 | |
| Redhat Enterprise Linux Desktop | =6.0 | |
| Redhat Enterprise Linux Desktop | =7.0 | |
| Redhat Enterprise Linux Server | =6.0 | |
| Redhat Enterprise Linux Server | =7.0 | |
| Redhat Enterprise Linux Server Aus | =7.6 | |
| Redhat Enterprise Linux Server Eus | =7.5 | |
| Redhat Enterprise Linux Server Eus | =7.6 | |
| Redhat Enterprise Linux Workstation | =6.0 | |
| Redhat Enterprise Linux Workstation | =7.0 | |
| Debian Debian Linux | =8.0 | |
| Debian Debian Linux | =9.0 | |
| Netapp Data Ontap Edge | ||
| Canonical Ubuntu Linux | =12.04 | |
| Canonical Ubuntu Linux | =14.04 | |
| Canonical Ubuntu Linux | =16.04 | |
| Canonical Ubuntu Linux | =18.04 | |
| HP HP-UX | ||
| openSUSE Leap | =15.0 | |
| openSUSE Leap | =15.1 | |
| openSUSE Leap | =42.3 | |
| debian/bind9 | 1:9.16.50-1~deb11u2 1:9.16.50-1~deb11u1 1:9.18.28-1~deb12u2 1:9.20.2-1 |
Remedy
Disable use of "deny-answer-aliases" feature
Remedy
Most operators will not need to make any changes unless they are using the "deny-answer-aliases" feature (which is described in the BIND 9 Adminstrator Reference Manual section 6.2.) "deny-answer-aliases" is off by default; only configurations which explicitly enable it can be affected by this defect. If you are using "deny-answer-aliases", upgrade to the patched release most closely related to your current version of BIND. 9.9.13-P1 9.10.8-P1 9.11.4-P1 9.12.2-P1 BIND Supported Preview Edition is a special feature preview branch of BIND provided to eligible ISC support customers. 9.11.3-S3
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Reference Links
- https://kb.isc.org/docs/aa-01639
- https://lists.debian.org/debian-lts-announce/2018/08/msg00033.html
- https://security.netapp.com/advisory/ntap-20180926-0003/
- https://access.redhat.com/errata/RHSA-2018:2570
- https://access.redhat.com/errata/RHSA-2018:2571
- https://usn.ubuntu.com/3769-1/
- https://usn.ubuntu.com/3769-2/
- http://www.securityfocus.com/bid/105055
- http://www.securitytracker.com/id/1041436
- https://security.gentoo.org/glsa/201903-13
- http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00026.html
- http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00027.html
- https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03927en_us
- https://lists.debian.org/debian-lts-announce/2021/11/msg00001.html
- https://launchpad.net/bugs/cve/CVE-2018-5740
- https://lists.isc.org/pipermail/bind-announce/2018-August/001098.html
- https://kb.isc.org/article/AA-01639/74/CVE-2018-5740
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1614040
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1614041
- https://gitlab.isc.org/isc-projects/bind9/merge_requests/607/commits
- https://bugzilla.redhat.com/show_bug.cgi?id=1613595
- https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03927en_us
- https://security-tracker.debian.org/tracker/CVE-2018-5740
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-5740
- https://nvd.nist.gov/vuln/detail/CVE-2018-5740
- https://ubuntu.com/security/CVE-2018-5740
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