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FortiGate: RSA-CRT key leak under certain conditions

Information

Severity

Severity

High

Family

Family

FortiOS Local Security Checks

CVSSv2 Base

CVSSv2 Base

7.8

CVSSv2 Vector

CVSSv2 Vector

AV:N/AC:L/Au:N/C:C/I:N/A:N

Solution Type

Solution Type

Vendor Patch

Created

Created

6 years ago

Modified

Modified

3 years ago

Summary

FortiOS now includes for all SSL libraries a countermeasure against Lenstra's fault attack on RSA-CRT optimization when a RSA signature is corrupted.

Affected Software

Affected Software

FortiGate < 5.0.13 / 5.2.6 / 5.4.0 with the SSLVPN web portal feature configured.

Detection Method

Detection Method

Checks if a vulnerable version is present on the target host.

Solution

Solution

Upgrade to FortiOS 5.0.13 / 5.2.6 / 5.4.0 or newer

Common Vulnerabilities and Exposures (CVE)