High severity · published Mar 27, 2017
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
7.5
CVSS
3.5%
EPSS
No
On KEV
Description
HKDF in cryptography before 1.5.2 returns an empty byte-string if used with a length less than algorithm.digest_size.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)3.5% · higher than 89% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CR
Cryptography · Cryptography.io
through 1.5.2 · source: NVD
FE
Fedora · Fedoraproject
23; 24; 25 · source: NVD
UL
Ubuntu Linux · Canonical
16.04; 16.10 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2016-9243
CVE.org
https://www.cve.org/CVERecord?id=CVE-2016-9243
Mailing List
http://www.openwall.com/lists/oss-security/2016/11/09/2
Broken Link
http://www.securityfocus.com/bid/94216
Third Party Advisory
http://www.ubuntu.com/usn/USN-3138-1
Release Notes
https://cryptography.io/en/latest/changelog
Patch
https://github.com/pyca/cryptography/commit/b924696b2e8731f39696584d12cceeb3aeb2d874
Issue Tracking
https://github.com/pyca/cryptography/issues/3211
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