title: Bouncy Castle BKS-V1 keystore files vulnerable to trivial hash collisions
description: The default BKS keystore use an HMAC that is only 16 bits long, which can allow an attacker to compromise the integrity of a BKS keystore. Bouncy Castle release 1.47 changes the BKS format to a format which uses a 160 bit HMAC instead. This applies to any BKS keystore generated prior to BC 1.47. For situations where people need to create the files for legacy reasons a specific keystore type "BKS-V1" was introduced in 1.49. It should be noted that the use of "BKS-V1" is discouraged by the library authors and should only be used where it is otherwise safe to do so, as in where the use of a 16 bit checksum for the file integrity check is not going to cause a security issue in itself.
problem types: CWE-327: Use of a Broken or Risky Cryptographic Algorithm
affected:
{
product: Bouncy Castle
vendor: Legion of the Bouncy Castle
versions:
lessThan: 1.47, status: affected, version: all, versionType: custom
}