Vulnerability in Bouncycastle Bc-Java
CVE-2018-5382
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.
Vulnerability class: POODLE (CVE-2014-3566)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.4 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (16.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 17th percentile — 16.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: -0.000
Affected products
- Bouncycastle Bc-Java
- Legion Of The Bouncy Castle — versions all
- Red Hat Satellite — versions 6.4
- Red Hat Satellite Capsule — versions 6.4
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.securityfocus.com/bid/103453 (VDB Entry, Third Party Advisory, vdb-entry)
- access.redhat.com/errata/RHSA-2018:2927 (vendor-advisory, Third Party Advisory)
- www.kb.cert.org/vuls/id/306792 (US Government Resource, Third Party Advisory, third-party-advisory)
- www.bouncycastle.org/releasenotes.html (Release Notes, Vendor Advisory)
- www.oracle.com/security-alerts/cpuoct2020.html (Third Party Advisory)
Frequently asked questions
- What is CVE-2018-5382?
- CVE-2018-5382 is a medium-severity vulnerability in Bouncycastle Bc-Java, classified under Use of a Broken or Risky Cryptographic Algorithm. CVSS score: 4.4/10. Published 2018-04-16.
- How severe is CVE-2018-5382?
- Medium severity. CVSS v3 base score is 4.4 out of 10.
- Is CVE-2018-5382 known to be exploited?
- 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.