Security Advisory - Weak Algorithm Vulnerability in Some Huawei Products

Successful exploit may cause information leak.

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:L/I:N/A:N)

Temporal Score: 4.9 (E:F/RL:O/RC:C)

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

1. The affected product uses RSA as the key exchange algorithm in the TLS cipher mode.

Vulnerability details:

To exploit the vulnerability, a remote, unauthenticated attacker has to capture TLS traffic between clients and the affected products. The attacker may launch the Bleichenbacher attack on RSA key exchange to decrypt the session key and the previously captured sessions by some cryptanalytic operations. Successful exploit may cause information leak.

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 discovered by Huawei internal tester.

2019-01-23 V1.2 UPDATED Updated the "Software Versions and Fixes" section;

2018-07-04 V1.1 UPDATED Updated Summary, Technique Details and the fixes information

2018-07-03 V1.0 INITIAL

None

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To report a security vulnerability in Huawei products and solutions, please send it to PSIRT@huawei.com. For details, please visit http://www.huawei.com/en/psirt/report-vulnerabilities.