Vulnerability in Cryptography.io Cryptography
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.035 (88.9th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 89th percentile — 88.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.035 · newest: 0.035 · change: 0.000
Affected products
- Cryptography.io Cryptography
- Canonical Ubuntu Linux — versions 16.04, 16.10
- Fedoraproject Fedora — versions 23, 24, 25
Public proof-of-concept exploits
References
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory, Mailing List, Third Party Advisory)
- www.ubuntu.com/usn/USN-3138-1 (vendor-advisory, Third Party Advisory)
- github.com/pyca/cryptography/commit/b924696b2e8731f39696584d12cceeb3aeb2d874 (Patch, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory, Mailing List, Third Party Advisory)
- www.securityfocus.com/bid/94216 (VDB Entry, Third Party Advisory, vdb-entry, Broken Link)
- www.openwall.com/lists/oss-security/2016/11/09/2 (mailing-list, Patch, Mailing List, VDB Entry)
- cryptography.io/en/latest/changelog (Third Party Advisory, Release Notes)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory, Mailing List, Third Party Advisory)
- github.com/pyca/cryptography/issues/3211 (Third Party Advisory, Issue Tracking)
Frequently asked questions
- What is CVE-2016-9243?
- CVE-2016-9243 is a high-severity vulnerability in Cryptography.io Cryptography. CVSS score: 7.5/10. Published 2017-03-27.
- How severe is CVE-2016-9243?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2016-9243 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.