ID CVE-2017-11104
Summary 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.
References
Vulnerable Configurations
  • cpe:2.3:a:knot-dns:knot_dns:2.4.4
    cpe:2.3:a:knot-dns:knot_dns:2.4.4
  • cpe:2.3:a:knot-dns:knot_dns:2.5.0
    cpe:2.3:a:knot-dns:knot_dns:2.5.0
  • cpe:2.3:a:knot-dns:knot_dns:2.5.1
    cpe:2.3:a:knot-dns:knot_dns:2.5.1
CVSS
Base: 4.3
Impact:
Exploitability:
CWE CWE-284
CAPEC
  • Embedding Scripts within Scripts
    An attack of this type exploits a programs' vulnerabilities that are brought on by allowing remote hosts to execute scripts. The attacker leverages this capability to execute scripts to execute his/her own script by embedding it within other scripts that the target software is likely to execute. The attacker must have the ability to inject script into script that is likely to be executed. If this is done, then the attacker can potentially launch a variety of probes and attacks against the web server's local environment, in many cases the so-called DMZ, back end resources the web server can communicate with, and other hosts. With the proliferation of intermediaries, such as Web App Firewalls, network devices, and even printers having JVMs and Web servers, there are many locales where an attacker can inject malicious scripts. Since this attack pattern defines scripts within scripts, there are likely privileges to execute said attack on the host. Of course, these attacks are not solely limited to the server side, client side scripts like Ajax and client side JavaScript can contain malicious scripts as well. In general all that is required is for there to be sufficient privileges to execute a script, but not protected against writing.
  • Signature Spoofing by Key Theft
    An attacker obtains an authoritative or reputable signer's private signature key by theft and then uses this key to forge signatures from the original signer to mislead a victim into performing actions that benefit the attacker.
nessus via4
  • NASL family SuSE Local Security Checks
    NASL id OPENSUSE-2018-494.NASL
    description This update for knot fixes the following issues : - CVE-2017-11104: Knot DNS contained 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. (boo#1047841)
    last seen 2019-02-21
    modified 2018-05-24
    plugin id 110067
    published 2018-05-24
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=110067
    title openSUSE Security Update : knot (openSUSE-2018-494)
  • NASL family Fedora Local Security Checks
    NASL id FEDORA_2017-D3D38A53F9.NASL
    description New upstream release: 2.4.5 Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen 2019-02-21
    modified 2018-02-02
    plugin id 101871
    published 2017-07-21
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=101871
    title Fedora 26 : knot (2017-d3d38a53f9)
  • NASL family Debian Local Security Checks
    NASL id DEBIAN_DSA-3910.NASL
    description Clement Berthaux from Synaktiv discovered a signature forgery vulnerability in knot, an authoritative-only DNS server. This vulnerability allows an attacker to bypass TSIG authentication by sending crafted DNS packets to a server.
    last seen 2019-02-21
    modified 2018-11-10
    plugin id 101555
    published 2017-07-17
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=101555
    title Debian DSA-3910-1 : knot - security update
  • NASL family DNS
    NASL id KNOT_DNS_2_5_2.NASL
    description The Knot DNS server running on the remote host is version 2.4.x prior to 2.4.5 or 2.5.x prior to 2.5.2. It is, therefore, affected by a TSIG authentication bypass vulnerability.
    last seen 2019-02-21
    modified 2018-07-13
    plugin id 106196
    published 2018-01-19
    reporter Tenable
    source https://www.tenable.com/plugins/index.php?view=single&id=106196
    title Knot DNS 2.4.x < 2.4.4 / 2.5.x < 2.5.2 TSIG Authentication Bypass Vulnerability (CVE-2017-11104)
refmap via4
bid 99598
debian DSA-3910
misc
Last major update 08-07-2017 - 06:29
Published 08-07-2017 - 06:29
Last modified 03-11-2017 - 21:29
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