CVE-2016-9243

HKDF in cryptography before 1.5.2 returns an empty byte-string if used with a length less than algorithm.digest_size.

CVSS v3.0 7.5 HIGH
CVSS v2.0 5.0 MEDIUM

7.5^/10

CVSS v3.0 : HIGH

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

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

5.0^/10

CVSS v2.0 : MEDIUM

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

Exploitability : 10.0 / Impact : 2.9

Access Vector NETWORK

Access Complexity LOW

Authentication NONE

Confidentiality Impact NONE

Integrity Impact PARTIAL

Availability Impact NONE

References

Link	Resource
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WQ5G7KHKZC4SI23JE7277KZXM57GEQKT/	Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/U23KDR2M2N7W2ZSREG63BVW7D4VC6CIZ/	Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/5R2ZOBMPWDFFHUZ6QOZZY36A6H5CGJXL/	Third Party Advisory
https://github.com/pyca/cryptography/issues/3211	Third Party Advisory
https://github.com/pyca/cryptography/commit/b924696b2e8731f39696584d12cceeb3aeb2d874	Patch Third Party Advisory
https://cryptography.io/en/latest/changelog	Release Notes Third Party Advisory
http://www.ubuntu.com/usn/USN-3138-1	Third Party Advisory
http://www.securityfocus.com/bid/94216	Third Party Advisory VDB Entry
http://www.openwall.com/lists/oss-security/2016/11/09/2	Mailing List Patch VDB Entry

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Configurations

Configuration 1 (hide)

cpe:2.3:a:cryptography.io:cryptography:*:*:*:*:*:*:*:*

Configuration 2 (hide)

OR	cpe:2.3:o:fedoraproject:fedora:24:::::::*
	cpe:2.3:o:fedoraproject:fedora:25:::::::*
	cpe:2.3:o:fedoraproject:fedora:23:::::::*

Configuration 3 (hide)

OR	cpe:2.3:o:canonical:ubuntu_linux:16.10:::::::*
	cpe:2.3:o:canonical:ubuntu_linux:16.04::::lts:::

Information

Published : 2017-03-27 10:59

Updated : 2017-04-04 09:00

NVD link : CVE-2016-9243

Mitre link : CVE-2016-9243

JSON object : View

CWE

CWE-20

Improper Input Validation

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Products Affected

canonical

ubuntu_linux

cryptography.io

cryptography

fedoraproject

fedora

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