CVE-2018-5740 - Reachable Assertion

Severity

50%

Complexity

99%

Confidentiality

48%

"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.

"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.

CVSS 3.0 Base Score 7.5. CVSS Attack Vector: network. CVSS Attack Complexity: low. CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

CVSS 2.0 Base Score 5. CVSS Attack Vector: network. CVSS Attack Complexity: low. CVSS Vector: (AV:N/AC:L/Au:N/C:N/I:N/A:P).

Demo Examples

Reachable Assertion

CWE-617

In the excerpt below, an AssertionError (an unchecked exception) is thrown if the user hasn't entered an email address in an HTML form.


               
assert email != null;

Overview

First reported 6 years ago

2019-01-16 20:29:00

Last updated 5 years ago

2019-10-03 00:03:00

Affected Software

ISC BIND

Red Hat Enterprise Linux Desktop 6.0

6.0

RedHat Enterprise Linux Desktop 7.0

7.0

Red Hat Enterprise Linux Server 6.0

6.0

RedHat Enterprise Linux Server 7.0

7.0

Red Hat Enterprise Linux Server Advanced mission critical Update Support (AUS) 7.6

7.6

Red Hat Enterprise Linux Server Extended Update Support (EUS) 7.5

7.5

Red Hat Enterprise Linux Server Extended Update Support (EUS) 7.6

7.6

Red Hat Enterprise Linux Workstation 6.0

6.0

RedHat Enterprise Linux Workstation 7.0

7.0

Debian Linux 8.0 (Jessie)

8.0

Canonical Ubuntu Linux 12.04 ESM (Extended Security Maintenance)

12.04

Canonical Ubuntu Linux 14.04 LTS (Long-Term Support)

14.04

Canonical Ubuntu Linux 16.04 LTS (Long-Term Support)

16.04

Canonical Ubuntu Linux 18.04 LTS Edition

18.04

References

openSUSE-SU-2019:1532

openSUSE-SU-2019:1533

105055

Third Party Advisory, VDB Entry

1041436

Third Party Advisory, VDB Entry

RHSA-2018:2570

Third Party Advisory

RHSA-2018:2571

Third Party Advisory

https://kb.isc.org/docs/aa-01639

Vendor Advisory

[debian-lts-announce] 20180830 [SECURITY] [DLA 1485-1] bind9 security update

Third Party Advisory

GLSA-201903-13

Third Party Advisory

https://security.netapp.com/advisory/ntap-20180926-0003/

Third Party Advisory

https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03927en_us

USN-3769-1

Third Party Advisory

USN-3769-2

Third Party Advisory

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