Vulnerability Details : 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.
Products affected by CVE-2016-9243
- cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:16.10:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:24:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:25:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:23:*:*:*:*:*:*:*
- cpe:2.3:a:cryptography.io:cryptography:*:*:*:*:*:python:*:*
Exploit prediction scoring system (EPSS) score for CVE-2016-9243
0.29%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 68 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2016-9243
Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
---|---|---|---|---|---|---|
5.0
|
MEDIUM | AV:N/AC:L/Au:N/C:N/I:P/A:N |
10.0
|
2.9
|
NIST | |
7.5
|
HIGH | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
3.9
|
3.6
|
NIST | |
7.5
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
3.9
|
3.6
|
NIST | 2024-09-09 |
References for CVE-2016-9243
-
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WQ5G7KHKZC4SI23JE7277KZXM57GEQKT/
[SECURITY] Fedora 24 Update: python-cryptography-1.5.3-3.fc24 - package-announce - Fedora Mailing-ListsThird Party Advisory
-
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/5R2ZOBMPWDFFHUZ6QOZZY36A6H5CGJXL/
[SECURITY] Fedora 23 Update: python-cryptography-vectors-1.5.3-1.fc23 - package-announce - Fedora Mailing-ListsThird Party Advisory
-
https://github.com/pyca/cryptography/commit/b924696b2e8731f39696584d12cceeb3aeb2d874
Fixes #3211 -- fixed hkdf's output with short length (#3215) · pyca/cryptography@b924696 · GitHubPatch;Third Party Advisory
-
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/U23KDR2M2N7W2ZSREG63BVW7D4VC6CIZ/
[SECURITY] Fedora 25 Update: python-cryptography-vectors-1.5.3-1.fc25 - package-announce - Fedora mailing-listsMailing List;Third Party Advisory
-
https://github.com/pyca/cryptography/issues/3211
HKDF key-length inconsistency · Issue #3211 · pyca/cryptography · GitHubIssue Tracking;Third Party Advisory
-
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WQ5G7KHKZC4SI23JE7277KZXM57GEQKT/
[SECURITY] Fedora 24 Update: python-cryptography-1.5.3-3.fc24 - package-announce - Fedora mailing-listsMailing List;Third Party Advisory
-
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5R2ZOBMPWDFFHUZ6QOZZY36A6H5CGJXL/
[SECURITY] Fedora 23 Update: python-cryptography-vectors-1.5.3-1.fc23 - package-announce - Fedora mailing-listsMailing List;Third Party Advisory
-
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/U23KDR2M2N7W2ZSREG63BVW7D4VC6CIZ/
[SECURITY] Fedora 25 Update: python-cryptography-vectors-1.5.3-1.fc25 - package-announce - Fedora Mailing-ListsThird Party Advisory
-
http://www.ubuntu.com/usn/USN-3138-1
USN-3138-1: python-cryptography vulnerability | Ubuntu security noticesThird Party Advisory
-
http://www.openwall.com/lists/oss-security/2016/11/09/2
oss-security - Re: CVE Request: Cryptography 1.5.3: HKDF might return an empty byte-stringMailing List;Patch;VDB Entry
-
https://cryptography.io/en/latest/changelog
Changelog — Cryptography 2.8.dev1 documentationRelease Notes;Third Party Advisory
-
http://www.securityfocus.com/bid/94216
Python Cryptography CVE-2016-9243 Security Bypass VulnerabilityBroken Link;Third Party Advisory;VDB Entry
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