Vulnerability Description
HKDF in cryptography before 1.5.2 returns an empty byte-string if used with a length less than algorithm.digest_size.
CVSS Score
7.5
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Cryptography.Io | Cryptography | <= 1.5.2 |
| Fedoraproject | Fedora | 23 |
| Canonical | Ubuntu Linux | 16.04 |
References
- http://www.openwall.com/lists/oss-security/2016/11/09/2Mailing ListPatchVDB Entry
- http://www.securityfocus.com/bid/94216Broken LinkThird Party AdvisoryVDB Entry
- http://www.ubuntu.com/usn/USN-3138-1Third Party Advisory
- https://cryptography.io/en/latest/changelogRelease NotesThird Party Advisory
- https://github.com/pyca/cryptography/commit/b924696b2e8731f39696584d12cceeb3aeb2PatchThird Party Advisory
- https://github.com/pyca/cryptography/issues/3211Issue TrackingThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproMailing ListThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproMailing ListThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproMailing ListThird Party Advisory
- http://www.openwall.com/lists/oss-security/2016/11/09/2Mailing ListPatchVDB Entry
- http://www.securityfocus.com/bid/94216Broken LinkThird Party AdvisoryVDB Entry
- http://www.ubuntu.com/usn/USN-3138-1Third Party Advisory
- https://cryptography.io/en/latest/changelogRelease NotesThird Party Advisory
- https://github.com/pyca/cryptography/commit/b924696b2e8731f39696584d12cceeb3aeb2PatchThird Party Advisory
- https://github.com/pyca/cryptography/issues/3211Issue TrackingThird Party Advisory
FAQ
What is CVE-2016-9243?
CVE-2016-9243 is a vulnerability with a CVSS score of 7.5 (HIGH). HKDF in cryptography before 1.5.2 returns an empty byte-string if used with a length less than algorithm.digest_size.
How severe is CVE-2016-9243?
CVE-2016-9243 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2016-9243?
Check the references section above for vendor advisories and patch information. Affected products include: Cryptography.Io Cryptography, Fedoraproject Fedora, Canonical Ubuntu Linux.