Description
HKDF in cryptography before 1.5.2 returns an empty byte-string if used with a length less than algorithm.digest_size.
References (9)
Core 9
Core References
Mailing List, Third Party Advisory vendor-advisory
x_refsource_fedora
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/U23KDR2M2N7W2ZSREG63BVW7D4VC6CIZ/
Third Party Advisory vendor-advisory
x_refsource_ubuntu
http://www.ubuntu.com/usn/USN-3138-1
Patch, Third Party Advisory x_refsource_confirm
https://github.com/pyca/cryptography/commit/b924696b2e8731f39696584d12cceeb3aeb2d874
Mailing List, Third Party Advisory vendor-advisory
x_refsource_fedora
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WQ5G7KHKZC4SI23JE7277KZXM57GEQKT/
Broken Link, Third Party Advisory, VDB Entry vdb-entry
x_refsource_bid
http://www.securityfocus.com/bid/94216
Mailing List, Patch, VDB Entry mailing-list
x_refsource_mlist
http://www.openwall.com/lists/oss-security/2016/11/09/2
Release Notes, Third Party Advisory x_refsource_confirm
https://cryptography.io/en/latest/changelog
Mailing List, Third Party Advisory vendor-advisory
x_refsource_fedora
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5R2ZOBMPWDFFHUZ6QOZZY36A6H5CGJXL/
Issue Tracking, Third Party Advisory x_refsource_confirm
https://github.com/pyca/cryptography/issues/3211
Scores
CVSS v3
7.5
EPSS
0.0165
EPSS Percentile
82.1%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Details
Status
published
Products (7)
canonical/ubuntu_linux
16.04
canonical/ubuntu_linux
16.10
cryptography.io/cryptography
< 1.5.2
fedoraproject/fedora
23
fedoraproject/fedora
24
fedoraproject/fedora
25
pypi/cryptography
0 - 1.5.3PyPI
Published
Mar 27, 2017
Tracked Since
Feb 18, 2026