Information disclosure in Bouncycastle Bc-Java
CVE-2016-2427
The AES-GCM specification in RFC 5084, as used in Android 5.x and 6.x, recommends 12 octets for the aes-ICVlen parameter field, which might make it easier for attackers to defeat a cryptographic protection mechanism and discover an authentication key via a crafted application, aka internal bug 26234568. NOTE: The vendor disputes the existence of this potential issue in Android, stating "This CVE was raised in error: it referred to the authentication tag size in GCM, whose default according to ASN.1 encoding (12 bytes) can lead to vulnerabilities. After careful consideration, it was decided that the insecure default value of 12 bytes was a default only for the encoding and not default anywhere else in Android, and hence no vulnerability existed.
Vulnerability class: Information Disclosure
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.004 (33.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 34th percentile — 33.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Bouncycastle Bc-Java — versions 1.54
- Google Android — versions 5.0, 5.0.1, 5.1
Weakness classification (CWE)
References
- source.android.com/security/bulletin/2016-04-02.html (Vendor Advisory)
Frequently asked questions
- What is CVE-2016-2427?
- CVE-2016-2427 is a medium-severity vulnerability in Bouncycastle Bc-Java, classified under Information Disclosure. CVSS score: 5.5/10. Published 2016-04-18.
- How severe is CVE-2016-2427?
- Medium severity. CVSS v3 base score is 5.5 out of 10.