CVE-2016-2427 — MEDIUM (5.5)

Vulnerability Description

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.

CVSS Score

5.5

MEDIUM

CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

NONE

Availability

NONE

Affected Products

Vendor	Product	Versions
Bouncycastle	Bc-Java	1.54
Google	Android	5.0

Related Weaknesses (CWE)

CWE-200

References

http://source.android.com/security/bulletin/2016-04-02.htmlVendor Advisory
http://source.android.com/security/bulletin/2016-04-02.htmlVendor Advisory

FAQ

What is CVE-2016-2427?

CVE-2016-2427 is a vulnerability with a CVSS score of 5.5 (MEDIUM). 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 prote...

How severe is CVE-2016-2427?

CVE-2016-2427 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2016-2427?

Check the references section above for vendor advisories and patch information. Affected products include: Bouncycastle Bc-Java, Google Android.