CVE-2018-5382

medium

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.

References

https://www.kb.cert.org/vuls/id/306792

https://www.bouncycastle.org/releasenotes.html

http://www.securityfocus.com/bid/103453

https://access.redhat.com/errata/RHSA-2018:2927

https://www.oracle.com/security-alerts/cpuoct2020.html

Details

Source: MITRE

Published: 2018-04-16

Updated: 2022-04-20

Type: CWE-354

Risk Information

CVSS v2

Base Score: 3.6

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

Impact Score: 4.9

Exploitability Score: 3.9

Severity: LOW

CVSS v3

Base Score: 4.4

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Impact Score: 2.5

Exploitability Score: 1.8

Severity: MEDIUM