Bug 1839821 (CVE-2020-12667) - CVE-2020-12667 knot-resolver: Traffic amplification triggered by random subdomains in the NSDNAME in NS records
Summary: CVE-2020-12667 knot-resolver: Traffic amplification triggered by random subdo...
Keywords:
Status: CLOSED UPSTREAM
Alias: CVE-2020-12667
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1839822 1839823
Blocks:
TreeView+ depends on / blocked
 
Reported: 2020-05-25 16:43 UTC by Pedro Sampaio
Modified: 2020-05-25 21:15 UTC (History)
3 users (show)

Fixed In Version:
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Last Closed: 2020-05-25 21:15:24 UTC
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Description Pedro Sampaio 2020-05-25 16:43:47 UTC 
Knot Resolver before 5.1.1 allows traffic amplification via a crafted DNS answer from an attacker-controlled server, aka an "NXNSAttack" issue. This is triggered by random subdomains in the NSDNAME in NS records.

References:

http://cyber-security-group.cs.tau.ac.il/#
http://www.openwall.com/lists/oss-security/2020/05/19/2
https://en.blog.nic.cz/2020/05/19/nxnsattack-upgrade-resolvers-to-stop-new-kind-of-random-subdomain-attack/
https://www.knot-resolver.cz/2020-05-19-knot-resolver-5.1.1.html
Comment 1 Pedro Sampaio 2020-05-25 16:44:17 UTC 
Created knot-resolver tracking bugs for this issue:

Affects: epel-7 [bug 1839823]
Affects: fedora-all [bug 1839822]
Comment 2 Product Security DevOps Team 2020-05-25 21:15:24 UTC 
This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.
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