CVE-2016-9243
High
Description
HKDF in cryptography before 1.5.2 returns an empty byte-string if used with a length less than algorithm.digest_size.
SeverityHigh
CVSS7.5
Exploit probability—
Product
Cryptography
PublishedMar 27, 2017
First seenMar 27, 2017
How to fix
Update
- cryptography1.5.3 or later
Vendor advisories
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/U23KDR2M2N7W2ZSREG63BVW7D4VC6CIZ/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WQ5G7KHKZC4SI23JE7277KZXM57GEQKT/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5R2ZOBMPWDFFHUZ6QOZZY36A6H5CGJXL/
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| cryptography.io cryptography | v ≤ 1.5.2 | — |
| fedoraproject fedora | 23, 24, 25 | — |
| canonical ubuntu_linux | 16.04, 16.10 | — |
| cryptographyPyPI | v < 1.5.3 | 1.5.3 |
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