A flaw in the "deny-answer-aliases" feature can cause an assertion failure in named
CVE-2018-5740

7.5HIGH

Key Information:

Vendor

Isc
Status
Bind 9
Vendor
CVE Published:
16 January 2019

Badges

👾 Exploit Exists🟡 Public PoC🟣 EPSS 69%

What is CVE-2018-5740?

"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.

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Deploy the Patch

Affected Version(s)

BIND 9 BIND 9 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

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

cve-2018-5740
Created by sischkg

References

http://www.securityfocus.com/bid/105055
vdb-entryx_refsource_BID
https://lists.debian.org/debian-lts-announce/2018/08/msg0...
mailing-listx_refsource_MLIST
https://access.redhat.com/errata/RHSA-2018:2570
vendor-advisoryx_refsource_REDHAT

EPSS Score

69% chance of being exploited in the next 30 days.

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability Reserved

Credit

ISC would like to thank Tony Finch of the University of Cambridge for reporting this issue.
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