Linux Kernel vulnerability CVE-2017-17806 on RSA Appliance

3 years ago

Originally Published: 2018-02-02

Article Number

000067156

Applies To

RSA Product Set: SecurID
RSA Product/Service Type: Authentication Manager
RSA Version/Condition: 8.2 SP1

CVE Identifier(s)

CVE-2017-17806

Article Summary

The HMAC implementation (crypto/hmac.c) in the Linux kernel before 4.14.8 does not validate that the underlying cryptographic hash algorithm is unkeyed, allowing a local attacker able to use the AF_ALG-based hash interface (CONFIG_CRYPTO_USER_API_HASH) and the SHA-3 hash algorithm (CONFIG_CRYPTO_SHA3) to cause a kernel stack buffer overflow by executing a crafted sequence of system calls that encounter a missing SHA-3 initialization.

CVSS v3 Base Score: 7.8 High CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Alert Impact

Not Exploitable

Resolution

The flaw exists but does not introduce additional risk.
The RSA Authentication Manager appliance is a single-purpose, single-user “appliance” and NOT a general, multi-user system. This vulnerability requires that the attacker have local access to the system. The only user who can log in to the appliance is already capable of obtaining root privileges and so the flaw does not add additional risk.

Disclaimer

Read and use the information in this RSA Security Advisory to assist in avoiding any situation that might arise from the problems described herein. If you have any questions regarding this product alert, contact RSA Software Technical Support at 1- 800 995 5095. RSA Security LLC and its affiliates, including without limitation, its ultimate parent company, EMC Corporation, distributes RSA Security Advisories in order to bring to the attention of users of the affected RSA products, important security information. RSA recommends that all users determine the applicability of this information to their individual situations and take appropriate action. The information set forth herein is provided 'as is' without warranty of any kind. RSA disclaims all warranties, either express or implied, including the warranties of merchantability, fitness for a particular purpose, title and non-infringement. In no event, shall RSA, its affiliates or suppliers, be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if RSA, its affiliates or suppliers have been advised of the possibility of such damages. Some jurisdictions do not allow the exclusion or limitation of liability for consequential or incidental damages, so the foregoing limitation may not apply.

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