VulnerabilityModified
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.
HIGH 7.5EPSS 3.46%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (3.46%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
HKDF in cryptography before 1.5.2 returns an empty byte-string if used with a length less than algorithm.digest_size.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- EPSS
- 3.46% probability · 88th percentile
- CISA KEV
- Not listed
- Affected
- cryptography.io/cryptography · fedoraproject/fedora · canonical/ubuntu linux
- Source
- secalert@redhat.com
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
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.