Advisory ID

13105

Release date

2017-01-27

Last Updated

2017-01-27

Issue Severity

Low

Source

Source

OpenSSL.org

Release date

2017-01-26

CVSS v2 Base Score

MEDIUM

Problem Description

There is a carry propagating bug in the x86_64 Montgomery squaring procedure. No EC algorithms are affected. Analysis suggests that attacks against RSA and DSA as a result of this defect would be very difficult to perform and are not believed likely. Attacks against DH are considered just feasible (although very difficult) because most of the work necessary to deduce information about a private key may be performed offline. The amount of resources required for such an attack would be very significant and likely only accessible to a limited number of attackers. An attacker would additionally need online access to an unpatched system using the target private key in a scenario with persistent DH parameters and a private key that is shared between multiple clients. For example this can occur by default in OpenSSL DHE based SSL/TLS ciphersuites.

Note: This issue is very similar to CVE-2015-3193 but must be treated as a separate problem.

Find more about CVE-2017-3732 reported by openssl.org.

Impact

The bug affects RSA, DSA and Diffie Hellman (DH) algorithms, however only for Diffie Hellman is the bug considered exploitable. BoKS Manager includes a number of SSL/TLS servers using RSA-based certificates, but none of them support DH/DHE-based cipher suites.

Affected Products

Product name

Version

BoKS ServerControl

7.0

Workaround

There is no known workaround for this vulnerability.

Obtaining Fixed Software

No hotfix is required due to the low vulnerability risk for FoxT products.

External References

OpenSSL security advisory.


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Last Modified On: May 25, 2018