Security Advisory - Distributed Denial-of-Service Vulnerablility in Some Huawei Products

Successful exploit can lead to a performance degradation of the recursive server, while the recursive server can also act as a reflector, resulting in a DDoS attack to target authoritative servers.

The vulnerability classification has been performed by using the CVSSv3 scoring system (http://www.first.org/cvss/specification-document).

Base Score: 8.6 (AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H)

Temporal Score: 8.0 (E:F/RL:O/RC:C)

This vulnerability can be exploited only when the following conditions are present:

Attacker can gain access to the device network.

Vulnerability details:

There is a DDoS vulnerability called "NXNSAttack" in some Huawei products. There is no effective limitation on the number of fetches performed when the DNS recursive server processes references. An attacker can exploit this vulnerability by sending a request for an attacker-controlled domain to a vulnerable DNS resolving server. Successful exploit can lead to a performance degradation of the recursive server, while the recursive server can also act as a reflector, resulting in a DDoS attack to target authoritative servers.

Customers should contact Huawei TAC (Huawei Technical Assistance Center) to request the upgrades. For TAC contact information, please refer to Huawei worldwide website at http://www.huawei.com/en/psirt/report-vulnerabilities.

This vulnerability is publicly disclosed.

2020-08-26 V1.0 INITIAL

None

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