lib/Crypto/PublicKey/ElGamal.py in PyCrypto through 2.6.1 generates weak ElGamal key parameters, which allows attackers to obtain sensitive information by reading ciphertext data (i.e., it does not have semantic security in face of a ciphertext-only attack). The Decisional Diffie-Hellman (DDH) assumption does not hold for PyCrypto's ElGamal implementation.
The MITRE CVE dictionary describes this issue as:
Find out more about CVE-2018-6594 from the MITRE CVE dictionary dictionary and NIST NVD.
NOTE: The following CVSS v3 metrics and score provided are preliminary and subject to review.
| CVSS3 Base Score | 5.3 |
|---|---|
| CVSS3 Base Metrics | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N |
| Attack Vector | Network |
| Attack Complexity | Low |
| Privileges Required | None |
| User Interaction | None |
| Scope | Unchanged |
| Confidentiality | Low |
| Integrity Impact | None |
| Availability Impact | None |
| Platform | Package | State |
|---|---|---|
| Red Hat Virtualization 4 | python-crypto | Will not fix |
| Red Hat Storage Console 2 | python-crypto | Will not fix |
| Red Hat OpenStack Platform 9.0 | python-crypto | Will not fix |
| Red Hat OpenStack Platform 8.0 (Liberty) | python-crypto | Will not fix |
| Red Hat OpenStack Platform 13.0 (Queens) | python-crypto | Will not fix |
| Red Hat OpenStack Platform 12.0 | python-crypto | Will not fix |
| Red Hat OpenStack Platform 11.0 (Ocata) | python-crypto | Will not fix |
| Red Hat OpenStack Platform 10 | python-crypto | Will not fix |
| Red Hat OpenShift Enterprise 3 | python-crypto | Will not fix |
| Red Hat Gluster Storage 3 | python-crypto | Will not fix |
| Red Hat Enterprise Linux OpenStack Platform 7.0 (Kilo) for RHEL 7 | python-crypto | Will not fix |
| Red Hat Enterprise Linux OpenStack Platform 6.0 (Juno) for RHEL 7 | python-crypto | Will not fix |
| Red Hat Enterprise Linux 7 | python-crypto | Will not fix |
| Red Hat Enterprise Linux 6 | python-crypto | Will not fix |
| Red Hat Ceph Storage 3 | python-crypto | Will not fix |
| Red Hat Ceph Storage 2 | python-crypto | Will not fix |
| Red Hat Ceph Storage 1.3 | python-crypto | Will not fix |
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