RouterOS versions 6.45.6 Stable, 6.44.5 Long-term, and below allow remote unauthenticated attackers to trigger DNS queries via port 8291. The queries are sent from the router to a server of the attacker's choice. The DNS responses are cached by the router, potentially resulting in cache poisoning

RouterOS versions 6.45.6 Stable, 6.44.5 Long-term, and below allow remote unauthenticated attackers to trigger DNS queries via port 8291.
The queries are sent from the router to a server of the attacker's choice. The DNS responses are cached by the router, potentially resulting in cache poisoning

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A vulnerability was discovered in MikroTik RouterOS. A missing authentication vulnerability exists in MikroTik RouterOS due to insufficient protections. An authenticated, remote attacker can exploit this, via the Winbox protocol by sending a crafted request, to trigger DNS queries. The queries are sent from the router to a server of the attacker's choice.
The requests are cached by the router, potentially resulting in cache poisoning.

Note that Nessus has sent a crafted request to the router to trigger a DNS request to the scanner in order to exploit this vulnerability.

According to its self-reported version, the remote networking device is running a version of MikroTik RouterOS prior to 6.44.6 LTS or 6.45.x prior to 6.45.7. It is, therefore, affected by multiple vulnerabilities :

  - Relative Path Traversal in NPK Parsing - RouterOS 6.45.6 Stable, RouterOS   6.44.5 Long-term, and below are vulnerable to an arbitrary directory creation   vulnerability via the upgrade package's name field. If an authenticated user   installs a malicious package then a directory could be created and the   developer shell could be enabled. (CVE-2019-3976)

  - RouterOS 6.45.6 Stable, RouterOS 6.44.5 Long-term, and below insufficiently   validate where upgrade packages are download from when using the autoupgrade   feature. Therefore, a remote attacker can trick the router into 'upgrading'   to an older version of RouterOS and possibly resetting all the system's   usernames and passwords. (CVE-2019-3977)

  - Insufficient Protections of a Critical Resource (DNS Requests/Cache) -   RouterOS versions 6.45.6 Stable, 6.44.5 Long-term, and below allow remote   unauthenticated attackers to trigger DNS queries via port 8291. The queries   are sent from the router to a server of the attacker's choice. The DNS   responses are cached by the router, potentially resulting in cache poisoning.

  - Improper DNS Response Handling - RouterOS versions 6.45.6 Stable, 6.44.5   Long-term, and below are vulnerable to a DNS unrelated data attack. The   router adds all A records to its DNS cache even when the records are   unrelated to the domain that was queried. Therefore, a remote attacker   controlled DNS server can poison the router's DNS cache via malicious   responses with additional and untrue records.

Note that Nessus has not tested for this issue but has instead relied only on the routers's self-reported version number.

ID	Name	Product	Family	Severity
502048	MikroTik RouterOS Missing Authentication for Critical Function (CVE-2019-3978)	Tenable OT Security	Tenable.ot	high
134714	MikroTik RouterOS DNS Cache Poisoning (CVE-2019-3978)	Nessus	Misc.	high
130432	MikroTik RouterOS < 6.44.6 LTS or 6.45.x < 6.45.7 Multiple Vulnerabilities	Nessus	Misc.	high

Detections

Analytics

CVE-2019-3978

high

Tenable Plugins

high

high

high