[Python-modules-team] Bug#889998: pycryptodome: CVE-2018-6594

[Salvatore Bonaccorso]

Source: pycryptodome
Version: 3.4.7-1
Severity: important
Tags: patch security upstream
Forwarded: https://github.com/Legrandin/pycryptodome/issues/90

Hi,

the following vulnerability was published for pycryptodome.

CVE-2018-6594[0]:
| 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.

If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2018-6594
    https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-6594
[1] https://github.com/Legrandin/pycryptodome/issues/90
[2] https://github.com/Legrandin/pycryptodome/commit/99c27a3b9e8a884bbde0e88c63234b669d4398d8

Regards,
Salvatore