CVE-2016-9243
HIGHCVSS 7.5/10EPSS 3.40%
Last modified
CVE-2016-9243 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. HKDF in cryptography before 1.5.2 returns an empty byte-string if used with a length less than algorithm.digest_size.. EPSS estimates a 3.40% chance of exploitation in the next 30 days.
Description
HKDF in cryptography before 1.5.2 returns an empty byte-string if used with a length less than algorithm.digest_size.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Cryptography.Io | Cryptography | <= 1.5.2 |
| Fedoraproject | Fedora | 23 |
| Fedoraproject | Fedora | 24 |
| Fedoraproject | Fedora | 25 |
| Canonical | Ubuntu Linux | 16.04 |
| Canonical | Ubuntu Linux | 16.10 |
References
- http://www.openwall.com/lists/oss-security/2016/11/09/2Mailing List, Patch, VDB Entry
- http://www.securityfocus.com/bid/94216Broken Link, Third Party Advisory, VDB Entry
- http://www.ubuntu.com/usn/USN-3138-1Third Party Advisory
- https://cryptography.io/en/latest/changelogRelease Notes, Third Party Advisory
- https://github.com/pyca/cryptography/commit/b924696b2e8731f39696584d12cceeb3aeb2d874Patch, Third Party Advisory
- https://github.com/pyca/cryptography/issues/3211Issue Tracking, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5R2ZOBMPWDFFHUZ6QOZZY36A6H5CGJXL/Mailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/U23KDR2M2N7W2ZSREG63BVW7D4VC6CIZ/Mailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WQ5G7KHKZC4SI23JE7277KZXM57GEQKT/Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2016/11/09/2Mailing List, Patch, VDB Entry
- http://www.securityfocus.com/bid/94216Broken Link, Third Party Advisory, VDB Entry
- http://www.ubuntu.com/usn/USN-3138-1Third Party Advisory
- https://cryptography.io/en/latest/changelogRelease Notes, Third Party Advisory
- https://github.com/pyca/cryptography/commit/b924696b2e8731f39696584d12cceeb3aeb2d874Patch, Third Party Advisory
- https://github.com/pyca/cryptography/issues/3211Issue Tracking, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5R2ZOBMPWDFFHUZ6QOZZY36A6H5CGJXL/Mailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/U23KDR2M2N7W2ZSREG63BVW7D4VC6CIZ/Mailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WQ5G7KHKZC4SI23JE7277KZXM57GEQKT/Mailing List, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is 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.
How severe is CVE-2016-9243?
CVE-2016-9243 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 3.40% probability of exploitation in the next 30 days.
How do I fix CVE-2016-9243?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
Are you affected by CVE-2016-9243?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST