Vulnerability CVE-2017-11104
Published: 2017-07-08

Description:
Knot DNS before 2.4.5 and 2.5.x before 2.5.2 contains a flaw within the TSIG protocol implementation that would allow an attacker with a valid key name and algorithm to bypass TSIG authentication if no additional ACL restrictions are set, because of an improper TSIG validity period check.

Type:

CWE-20

 (Improper Input Validation)

CVSS2 => (AV:N/AC:M/Au:N/C:N/I:P/A:N)

CVSS Base Score
Impact Subscore
Exploitability Subscore
4.3/10
2.9/10
8.6/10
Exploit range
Attack complexity
Authentication
Remote
Medium
No required
Confidentiality impact
Integrity impact
Availability impact
None
Partial
None
Affected software
Knot-dns -> Knot dns 

 References:
http://www.debian.org/security/2017/dsa-3910
http://www.securityfocus.com/bid/99598
http://www.synacktiv.ninja/ressources/Knot_DNS_TSIG_Signature_Forgery.pdf
https://bugs.debian.org/865678
https://lists.nic.cz/pipermail/knot-dns-users/2017-June/001144.html
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