Summary

Security Advisory ID : BSA-2022-765

Component : OpenSSL

Revision : 1.0

If an application encounters a fatal protocol error and then calls SSL_shutdown() twice (once to send a close_notify, and once to receive one) then OpenSSL can respond differently to the calling application if a 0-byte record is received with invalid padding compared to if a 0-byte record is received with an invalid MAC. If the application then behaves differently based on that in a way that is detectable to the remote peer, then this amounts to a padding oracle that could be used to decrypt data. In order for this to be exploitable "non-stitched" ciphersuites must be in use. Stitched ciphersuites are optimised implementations of certain commonly used ciphersuites. Also, the application must call SSL_shutdown() twice even if a protocol error has occurred (applications should not do this but some do anyway). Fixed in OpenSSL 1.0.2r (Affected 1.0.2-1.0.2q). More at: https://www.openssl.org/news/secadv/20190226.txt

Affected Products

• Brocade ASCG OVA before v2.1.0
• Brocade SANnav versions before v2.2.0.2 and v2.1.1.8 on port 443 & 18082

Products Confirmed Not Vulnerable

• Brocade Fabric OS

No other Brocade Fibre Channel Products from Broadcom are affected by this vulnerability.

Solution

A security update has been provided in Brocade ASCG OVA version 2.1.0, Brocade SANnav v2.2.0.2 and Brocade SANnav v2.1.1.8 on ports 443 & 18082, and upper Brocade ASCG and Brocade SANnav releases.

Revision History