Some Huawei VRP-based products have an Ethernet in the First Mile (EFM) flapping vulnerability due to the lack of type-length-value (TLV) consistency check. An attacker may craft malformed packets and send them to a device to cause EFM flapping. (Vulnerability ID: HWPSIRT-2016-09025)
This vulnerability has been assigned a Common Vulnerabilities and Exposures (CVE) ID: CVE-2017-2712.
Huawei has released software updates to fix this vulnerability. This advisory is available at the following link:
Resolved Product and Version
Upgrade to V100R006SPH029
An attacker may craft malformed packets and send them to a device to cause EFM flapping.
The vulnerability classification has been performed by using the CVSSv3 scoring system (http://www.first.org/cvss/specification-document).
Base Score: 5.3 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)
Temporal Score: 4.9 (E:F/RL:O/RC:C)
This vulnerability can be exploited only when the following conditions are present:
1. The attacker gains access to the device network.
Due to the lack of type-length-value (TLV) consistency check, an attacker may craft malformed packets and send them to a device to cause EFM flapping.
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 was reported to Huawei PSIRT by System Security Lab of The Chinese University of Hong Kong and Independent Researcher Zhou Li. Huawei would like to thank System Security Lab of The Chinese University of Hong Kong and Independent Researcher Zhou Li for working with us and coordinated vulnerability disclosure to protect our customers.
2017-01-18 V1.0 INITIAL
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