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Vulnerability Details : 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.
Publish Date : 2017-03-27 Last Update Date : 2017-04-04
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- CVSS Scores & Vulnerability Types

CVSS Score
5.0
Confidentiality Impact None (There is no impact to the confidentiality of the system.)
Integrity Impact Partial (Modification of some system files or information is possible, but the attacker does not have control over what can be modified, or the scope of what the attacker can affect is limited.)
Availability Impact None (There is no impact to the availability of the system.)
Access Complexity Low (Specialized access conditions or extenuating circumstances do not exist. Very little knowledge or skill is required to exploit. )
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s)
CWE ID 20

- Products Affected By CVE-2016-9243

# Product Type Vendor Product Version Update Edition Language
1 OS Canonical Ubuntu Linux 16.04 ~~lts~~~ Version Details Vulnerabilities
2 OS Canonical Ubuntu Linux 16.10 Version Details Vulnerabilities
3 Application Cryptography.io Cryptography 1.5.2 Version Details Vulnerabilities
4 OS Fedoraproject Fedora 23 Version Details Vulnerabilities
5 OS Fedoraproject Fedora 24 Version Details Vulnerabilities
6 OS Fedoraproject Fedora 25 Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Canonical Ubuntu Linux 2
Cryptography.io Cryptography 1
Fedoraproject Fedora 3

- References For CVE-2016-9243

https://lists.fedoraproject.org/archives/list/[email protected]/message/WQ5G7KHKZC4SI23JE7277KZXM57GEQKT/
FEDORA FEDORA-2016-d3a2b640ce
https://lists.fedoraproject.org/archives/list/[email protected]/message/U23KDR2M2N7W2ZSREG63BVW7D4VC6CIZ/
FEDORA FEDORA-2016-2d90e27e50
https://github.com/pyca/cryptography/issues/3211 CONFIRM
https://lists.fedoraproject.org/archives/list/[email protected]/message/5R2ZOBMPWDFFHUZ6QOZZY36A6H5CGJXL/
FEDORA FEDORA-2016-e77c8c1f3b
https://github.com/pyca/cryptography/commit/b924696b2e8731f39696584d12cceeb3aeb2d874 CONFIRM
http://www.ubuntu.com/usn/USN-3138-1
UBUNTU UBUNTU-3138-1
https://cryptography.io/en/latest/changelog CONFIRM
http://www.openwall.com/lists/oss-security/2016/11/09/2
MLIST [oss-security] 20161109 Re: CVE Request: Cryptography 1.5.3: HKDF might return an empty byte-string
http://www.securityfocus.com/bid/94216
BID 94216 Python Cryptography CVE-2016-9243 Security Bypass Vulnerability Release Date:2016-11-15

- Metasploit Modules Related To CVE-2016-9243

There are not any metasploit modules related to this CVE entry (Please visit www.metasploit.com for more information)


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