Bug 1649051 (CVE-2018-14663)

Summary: CVE-2018-14663 dnsdist: Record smuggling when adding ECS or XPF
Product: [Other] Security Response Reporter: Pedro Sampaio <psampaio>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: NEW --- QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: ruben, sander
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard: impact=low,public=20181108,reported=20181112,source=internet,cvss3=5.9/CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N,cwe=CWE-20,fedora-all/dnsdist=affected,epel-7/dnsdist=affected
Fixed In Version: dnsdist 1.3.3 Doc Type: If docs needed, set a value
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---
Bug Depends On: 1649052, 1649053    
Bug Blocks:    

Description Pedro Sampaio 2018-11-12 19:29:21 UTC
An issue has been found in PowerDNS DNSDist allowing a remote attacker to craft a DNS query with trailing data such that the addition of a record by dnsdist, for example an OPT record when adding EDNS Client Subnet, might result in the trailing data being smuggled to the backend as a valid record while not seen by dnsdist. This is an issue when dnsdist is deployed as a DNS Firewall and used to filter some records that should not be received by the backend. This issue occurs only when either the ‘useClientSubnet’ or the experimental ‘addXPF’ parameters are used when declaring a new backend.

References:

https://dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2018-08.html

Comment 1 Pedro Sampaio 2018-11-12 19:29:56 UTC
Created dnsdist tracking bugs for this issue:

Affects: epel-7 [bug 1649053]
Affects: fedora-all [bug 1649052]